These regulations do not limit or supersede any other regulation concerning vehicle equipment or means of enforcing laws or regulations relating to vehicle equipment. These regulations may not be construed to prohibit a person from exceeding the requirements of these regulations. These regulations apply to: Each vehicle defined in Regulation .02 of this chapter; Each person who owns, operates, maintains, or repairs a vehicle; and Each motor carrier as defined in the Code of Federal Regulations, Title 49, §390.05, its officers and employees, and each person employed under contract by a motor carrier. In this subtitle, the following terms have the meanings indicated. Terms Defined. “Administration” means the Maryland Motor Vehicle Administration of the Maryland Department of Transportation. “Department” means the Department of State Police. “Operator” means any person who drives, operates, moves, or is in physical control of a vehicle or combination of vehicles. “Preventive maintenance program” means a systematic vehicle inspection, service, repair, and maintenance program requiring specified equipment on certain vehicles to be maintained in a safe operating condition. “Rejection” for the purpose of these regulations means repair. “Vehicle” for the purpose of these regulations means any vehicle registered under the Transportation Article, Title 13, Annotated Code of Maryland, as: A Class E (truck) vehicle with a registered gross vehicle weight greater than 10,000 pounds; A Class E (truck) vehicle with a registered combination vehicle weight greater than 10,000 pounds when operated in combination with a freight trailer or semitrailer; A Class F (tractor) vehicle; A Class G (freight trailer or semitrailer) vehicle, for which the owner pays a flat registration fee; A Class M (multipurpose passenger) vehicle which has a seating capacity for 16 or more passengers including the driver, or was previously registered as a Class H (school) vehicle or a Class P (passenger bus) vehicle, and which is used to primarily transport passengers; A Class P (passenger bus) vehicle; or Any vehicle or combination of vehicles owned by this State or any political subdivision of this State which are: Single unit trucks with a gross vehicle weight greater than 10,000 pounds, Single unit trucks with a gross combination vehicle weight greater than 10,000 pounds when operated in combination with a freight trailer or semitrailer, Truck tractor vehicles, Freight trailer or semitrailer vehicles, and Buses designed and used to carry more than 10 people and not regulated by Transportation Article, §25-110, Annotated Code of Maryland. Except as required by §B of this regulation, once every 12 months or when a vehicle has travelled 25,000 miles, whichever comes first, each owner shall: Systematically inspect, maintain, and repair each vehicle owned; or Cause each vehicle owned to be systematically inspected, maintained, and repaired. An owner of a vehicle operating with a dump service registration under Transportation Article, §13-919, Annotated Code of Maryland, that has been in operation for at least 18 years from the later of the vehicle's model year or first registration date, shall, at intervals of 12,500 miles or 6 months, whichever comes first: Systematically inspect, maintain, and repair each vehicle owned; or Cause each vehicle owned to be systematically inspected, maintained, and repaired. Items of Inspection. At a minimum, the following equipment on each vehicle defined in these regulations shall be inspected, maintained, and repaired to meet the requirements established by the Administration and Department: Alignment; Suspension; Steering; Brake systems; Tires; Wheels, rims, studs, nuts; Fuel storage and delivery; Exhaust system; Vehicle frame, body, and sheet metal; Electrical system; Emergency equipment; Seats and seat belts; Sun visor; Mirrors; Glazing; Windshield wipers and defroster; Certain power train components; Speedometer and odometer; Clutch and brake pedal pad; Horn; Hitches and coupling devices; Tanks and pressure vessels. Each owner shall maintain or cause to be maintained the following records for each vehicle: Identification by year, make, model, title number, and manufacturer's vehicle identification number. The vehicle identification number may not be recorded from documents, but shall be taken from the actual number on the vehicle. A record of inspection, repair, and maintenance, including vehicle mileage and date or dates of action taken. A copy of the certification required by Regulation .05 of this chapter. Administrative Forms. When performing inspection, service, maintenance, or repairs, an owner shall record, or cause to be recorded, on a form acceptable to the Department, action taken on each item listed in Regulation .03B of this chapter. If an owner uses a form which contains additional items, the owner shall ensure that all items contained in Regulation .03B of this chapter are included on the form and are highlighted. Forms shall be completed to indicate the date of inspection, date of repairs, mileage on the vehicle on the date of inspection or repair, and signature of the owner or authorized representative. An owner or agent of an owner may not willfully record or cause to be recorded any false or fraudulent information on any form or forms required by these regulations. Record Retention. Records required under this regulation shall be kept at the location where the vehicle is garaged, assigned, or maintained. Records shall be retained for a period of 2 years. However, records need only be retained for a period of 6 months after a vehicle is sold, traded, junked, or otherwise transferred or disposed of by an owner. If vehicle records are not maintained in Maryland, they shall, upon request of the Department, be made available within 5 working days. Records shall be available for inspection by Department personnel, or other personnel authorized by the Department, during normal business hours. Upon applying for an initial or renewal registration for a vehicle defined in this chapter, an owner shall certify that the vehicle is maintained under a preventive maintenance plan established by the Administration and the Department. A vehicle may not be operated on the highways of this State unless one of the following documents is carried in or on the vehicle: A record on a form approved by the Department of the most recent inspection, including any maintenance or repair work performed; or A written certification, on a form approved by the Department, that the vehicle is maintained under a preventive maintenance plan established by the Department. If the owner is a corporation, all certifications required by this chapter may be signed by a corporate officer or an individual with written power of attorney to sign for the corporation. All written powers of attorney shall be filed with the Department. It shall be the responsibility of the operator to ensure that the certification required under this chapter is carried in or on the vehicle at all times. If a vehicle is maintained by this State or any political subdivision of this State, the certification may be signed by a designee of the owner. Transportation Article, §§12-104(b) and 23-303, Annotated Code of Maryland Effective date: January 8, 1990 (16:26 Md. R. 2796) Regulation .01C amended effective May 20, 1996 (23:10 Md. R. 732) Regulation .02B amended effective April 1, 1991 (18:6 Md. R. 687); May 20, 1996 (23:10 Md. R. 732) Regulation .03 amended effective May 20, 1996 (23:10 Md. R. 732) Regulation .04 amended effective May 20, 1996 (23:10 Md. R. 732) Regulation .05 amended effective May 20, 1996 (23:10 Md. R. 732) The standards, requirements, and procedures set forth in this chapter are applicable to equipment originally installed by the manufacturer or required by federal or State law or regulation on any vehicle registered as a Class E (truck) vehicle with a registered gross vehicle weight or gross combination weight greater than 10,000 pounds, or a Class F (tractor) vehicle under the provisions of Transportation Article, Title 13, Annotated Code of Maryland, or any single unit truck with a gross vehicle weight greater than 10,000 pounds or a gross combination vehicle weight greater than 10,000 pounds when operated in combination with a freight trailer or semitrailer or any truck tractor owned by this State or any political subdivision of this State. Compliance with these minimum requirements may not be sufficient for the equipment to remain in compliance with the minimum time or mileage requirements of COMAR 11.22.01.03A and B. Therefore, more frequent maintenance, service, and repair as considered necessary by the owner is permitted and recommended. Axles, beams, spindles, or mountings which are broken, damaged, worn, rusted, bent, or modified may affect wheel alignment, tracking, or vehicle handling or stability. Spring and Attachments. Unequal vehicle height, broken or damaged spring leaves, spring shackles, bushings, center bolts, U-bolts, control arms, torque arms, torsion bars or equalizers can affect vehicle steering, alignment, tracking, handling, and stability. With vehicle on a level surface, inspect: Torsion Bar. All other suspension components shall be inspected the same as leaf spring suspension. Coil Springs and Mountings. Visually inspect coil springs, control arms, rear torque arms, axle strut (when equipped), and front and rear stabilizer bar (when equipped). Rubber Load Cushions. All other suspension components shall be inspected the same as leaf spring suspension. Tandem Axle Walking Beams. Air Suspension (All Axles). Two procedures are required to inspect air suspension systems. Air Suspension Nondriving Rear Axle. Inspection is conducted with normal air pressure in suspension system. Shock Absorbers (if Equipped). Shock absorber inspection includes leakage, mounting, and all related attachments. When originally equipped with shock absorbers, inspect for: Road Clearance. Kingpins. Raise or jack the vehicle by the frame or suspension. Brakes should be applied to eliminate wheel bearing play. Ball Joints. Inspect ball joints for vertical and horizontal movement, modifications, and damage. Lash. Inspection of vehicles equipped with power steering shall be conducted with the engine running, power steering fluid at the proper level, and belts in proper condition and tension. Front Wheel Bearings. With front wheels raised, grasp wheel and tire assembly at top and bottom and rock wheel in and out. Wheel bearing movement is determined by movement of brake drum and backing plate or brake disc and shields. Do not confuse suspension or ball joint play with wheel bearing play. Steering Travel. Turn steering wheel through full right and full left cycle. The vehicle may be slowly moved or the steering wheels raised to ease inspection. Inspect for: Steering Linkage. Move steering wheel left and right and observe movement in steering components. If the vehicle is equipped with power steering, run the engine. Visually inspect: Power Steering System. Manually and visually inspect entire system for: Collapsible Steering Column (if Applicable). Inspect for condition and mounting. Parking Brakes. Brake Lines and Hoses. Visually inspect: Brake Failure Indicators. Visually inspect: Brake Pedal Reserve and Leakage Test. Without pumping or repeated brake pedal applications, apply a moderate foot force to pedal and maintain for 1 minute. Inspect: Hydraulic System with Hydraulic Assist. Vehicles equipped with an electrically driven hydraulic pump that functions in the event of a power steering failure may be checked by applying pressure on the brake pedal and turn the ignition switch from “off” to “on” position. Vacuum System. Power Brake Operation. Vacuum Reserve. Vacuum Pump (if Applicable). Drum Brakes—Hydraulic. Disc Brakes—Hydraulic. Brake Lines and Hoses—Hydraulic. Master Cylinder. Visually inspect master cylinder for: Low Air Indicator. Compressor and Belt or Belts. Compressor Operation. Air pressure shall be reduced to 50 psi and the engine started and operated at approximately 1200 rpm. Air Leakage. Inspection for leakage shall be conducted with a fully charged system and brakes fully applied. Air Reserve. Air Reservoir and Valves. Parking and Emergency Brake Application. Vehicles with original equipment air-operated parking brakes are permissible. There are different systems designed for automatic or manual operation of the system as the design allows (check automatic application of brakes when air tanks are being drained). Gladhands and Air System. Brake Mechanical Components. Do not attempt to dismantle a double diaphragm spring brake unit while it is on the vehicle. Utilize a safety cage and remove the entire unit from the vehicle. Replace with a new or rebuilt assembly. When rebuilding or overhauling a brake chamber, strict adherence to manufacturer's procedures is required. Inspect brake chamber for: Slack Adjuster (Push Rod) Travel. With the assistance of a second party, make a treadle valve application at 85 psi in system and note rod travel. Wedge Brake. With the assistance of a second party, make a full brake application. Brake Camshafts. Brake Linings—Air Brakes. Visually inspect brake shoes. If shoes cannot be seen, removal of the lower portion of the dust cover is required. Brake Drums Air Brakes. Disc Brakes—Air. Tire Inspection—Steering Axle. Tire Inspection—Nonsteering Axle. Wheels. Visually inspect: Rims. Visually inspect for: Lock Rings. Studs, Nuts, and Clamps. Inspect for: Inspect pedals for: Fuel Storage. Visually inspect: Fuel Delivery System. Visually inspect: Visually inspect: Universal Joints. With spring brakes on and gear selector in neutral, place a small bar between the yoke and the U-joint and rotate the shaft back and forth. Frame. Engine Mounting. Frame Cross Member. Cab Mounts. Tilt Cab. Inspect for presence and condition of: Air Suspension Cab. Cab Floors and Floor Covering. Hood or Engine Cover. Doors, Handles, Latches, and Hinges. Cab Step and Grab Handles. Fenders and Rear Protector (Mud) Flaps. Rear protector flaps are not required on an uncoupled truck tractor, farm truck, farm truck tractor, pole trailer, or any vehicle when the construction is such that complete freedom around the wheel area is necessary to secure the designed use of the vehicle. Sheet Metal. Bumpers. Headlamps. Inspect headlamps for: Tail Lamps. Inspect tail lamps for: Stop Lamps. Inspect stop lamps for: Turn Signal Lamps. Inspect turn signal lamps for: Hazard Warning Lamps. Inspect hazard warning lamps for: Side Marker Lamps. Side marker lamps may function as both side marker and clearance lamps. Inspect side marker lamps for: Clearance Lamps. Clearance lamps are not required on vehicles less than 80 inches in width or on rear of truck tractors. Inspect clearance lamps for: Identification Lamps. Identification lamps are not required on vehicles less than 80 inches in width, or on rear of truck tractors. Inspect identification lamps for: License Plate Lamp or Lamps. Inspect license plate lamp or lamps for: Additional Lamps (if Equipped). Instrument and Indicator Lamps. Inspect for presence and function of: Reflectors. Wiring. Visually inspect wiring for: Battery. Visually inspect battery for: Trailer Cord. Inspect trailer cord for: Switches. Roadside Warning Devices. Each vehicle shall be equipped with three bidirectional emergency reflective triangles. Inspect bidirectional emergency reflective triangles for: Fire Extinguisher. Vehicles used to transport hazardous materials shall be equipped with a fire extinguisher with an Underwriters Laboratory rating of at least 10 BC. Vehicles used to transport nonhazardous materials shall be equipped with at least one fire extinguisher with an Underwriters Laboratory rating of at least 5 BC or two fire extinguishers with an Underwriters Laboratory rating of at least 4 BC. Inspect fire extinguisher for: Fuses. Each vehicle using fused electric circuits shall be equipped with at least one spare fuse of each type and size of the fuses used in the vehicle. Seats. Visually inspect seat for: Seat Belts (Applicable to Vehicles Manufactured on and after January 1, 1965). Inspect seat belt for: Visually inspect visor for: Outside Mirrors. From driver's seat, inspect mirrors for: Inside Mirror (When Required). From driver's seat, inspect mirror for: Windshield. Visually inspect windshield for: Side Windows. Inspect for: Windshield Wipers. Inspect windshield wipers for: Windshield Washers (if Equipped). Defroster. Gear Selector. Neutral Safety Switch. Speedometer. Odometer/hubometer. Brake Pedal. Inspect brake pedal for: Clutch Pedal. Inspect clutch pedal for: Inspect for: Fifth Wheel Coupling. Inspect for: No-Slack Hitch. Apply air pressure to no-slack hitch before inspecting. Trailer Hitches. Inspect hitch for: Tanks. Inspect: Pressure Vessels. Inspect: Transportation Article, §§ 12-104(b) and 23-303, Annotated Code of Maryland Effective date: January 8, 1990 (16:26 Md. R. 2796) Regulation .01 amended effective May 20, 1996 (23:10 Md. R. 732) The standards, requirements, and procedures set forth in this chapter are applicable to equipment originally installed by the manufacturer or required by federal or State law or regulation on any vehicle registered as a Class M (multipurpose) passenger vehicle which has a seating capacity for 16 or more passengers including the driver or was previously registered as a Class H (school) vehicle or a Class P (passenger bus) vehicle, and which is used primarily to transport passengers, under the provisions of Transportation Article, Title 13, Annotated Code of Maryland, or any bus designed and used to carry more than 10 people owned by this State or any political subdivision of this State. Compliance with these minimum requirements may not be sufficient for the equipment to remain in compliance for 12 months or 25,000 miles, whichever occurs first. Therefore, more frequent maintenance, service, and repair as deemed necessary by the owner is permitted and recommended. Axles, beams, spindles, or mountings which are broken, damaged, worn, rusted, bent, or modified may affect wheel alignment, tracking, or vehicle handling or stability. Spring and Attachments. Unequal vehicle height, broken or damaged spring leaves, spring shackles, bushings, center bolts, U-bolts, control arms, torque arms, torsion bars, or equalizers can affect vehicle steering, alignment, tracking, handling, and stability. With vehicle on a level surface, inspect: Torsion Bar. All other suspension components shall be inspected the same as leaf spring suspension. Coil Springs and Mountings. Visually inspect coil springs, control arms, rear torque arms, axle strut (when equipped), and front and rear stabilizer bar (when equipped). Rubber Load Cushions. All other suspension components shall be inspected the same as leaf spring suspension. Tandem Axle Walking Beams. Air Suspension (All Axles). Two procedures are required to inspect air suspension systems. Air Suspension Nondriving Rear Axle. Inspection is conducted with normal air pressure in suspension system. Shock Absorbers (if Equipped). Shock absorber inspection includes leakage, mounting, and all related attachments. When originally equipped with shock absorbers, inspect for: Road Clearance. Kingpins. Raise or jack the vehicle by the frame or suspension. Brakes should be applied to eliminate wheel bearing play. Ball Joints. Inspect ball joints for vertical and horizontal movement, modifications, and damage. Lash. Inspection of vehicles equipped with power steering shall be conducted with the engine running, power steering fluid at the proper level, and belts in proper condition and tension. Front Wheel Bearings. With front wheels raised, grasp wheel and tire assembly at top and bottom and rock wheel in and out. Wheel bearing movement is determined by movement of brake drum and backing plate or brake disc and shields. Do not confuse suspension or ball joint play with wheel bearing play. Steering Travel. Turn steering wheel through full right and full left cycle. The vehicle may be slowly moved or the steering wheels raised to ease inspection. Inspect for: Steering Linkage. Move steering wheel left and right and observe movement in steering components. If the vehicle is equipped with power steering, run the engine. Visually inspect: Power Steering System. Manually and visually inspect entire system for: Collapsible Steering Column (if applicable). Inspect for condition and mounting. Parking Brakes. Brake Lines and Hoses. Visually inspect: Brake Failure Indicators. Visually inspect: Brake Pedal Reserve and Leakage Test. Without pumping or repeated brake pedal applications, apply a moderate foot force to pedal and maintain for 1 minute. Inspect: Hydraulic System with Hydraulic Assist. Vehicles equipped with an electrically driven hydraulic pump that functions in the event of a power steering failure may be checked by applying pressure on the brake pedal and turn the ignition switch from “off” to “on” position. Vacuum System. Power Brake Operation. Vacuum Reserve. Vacuum Pump (if Applicable). Drum Brakes—Hydraulic. Disc Brakes—Hydraulic. Brake Lines and Hoses—Hydraulic. Master Cylinder. Visually inspect master cylinder for: Low Air Indicator. Compressor and Belt or Belts. Compressor Operation. Air pressure shall be reduced to 50 psi and the engine started and operated at approximately 1200 rpm. Air Leakage. Inspection for leakage shall be conducted with a fully charged system and brakes fully applied. Air Reserve. Air Reservoir and Valves. Parking and Emergency Brake Application. Vehicles with original equipment air-operated parking brakes are permissible. There are different systems designed for automatic or manual operation of the system as the design allows (check automatic application of brakes when air tanks are being drained). Air System. Brake Mechanical Components. Do not attempt to dismantle a double diaphragm spring brake unit while it is on the vehicle. Utilize a safety cage and remove the entire unit from the vehicle. Replace with a new or rebuilt assembly. When rebuilding or overhauling a brake chamber, strict adherence to manufacturer's procedures is required. Inspect brake chamber for: Slack Adjuster (Push Rod) Travel. With the assistance of a second party, make a treadle valve application at 85 psi in system and note rod travel. Wedge Brake. With the assistance of a second party, make a full brake application. Brake Camshafts. Brake Linings—Air Brakes. Visually inspect brake shoes. If shoes cannot be seen, removal of the lower portion of the dust cover is required. Brake Drums—Air Brakes. Disc Brakes—Air. Tire Inspection—Steering Axle. Tire Inspection—Nonsteering Axle. Wheels. Visually inspect: Rims. Visually inspect for: Lock Rings. Studs, Nuts, and Clamps. Inspect for: Inspect pedals for: Fuel Storage. Visually inspect: Fuel Delivery System. Visually inspect: Visually inspect: Universal Joints. With spring brakes on and gear selector in neutral, place a small bar between the yoke and the U-joint and rotate the shaft back and forth. Frame. Engine Mounting. Frame Cross Member. Body Mounts. Floors and Floor Covering. Hood or Engine Cover. Doors, Handles, Latches, and Hinges. Entrance Steps and Grab Handles or Bars. Fenders and Rear Protector (Mud) Flaps. Rear protector flaps are not required on an uncoupled truck tractor, farm truck, farm truck tractor, pole trailer, or any vehicle when the construction is such that complete freedom around the wheel area is necessary to secure the designed use of the vehicle. Sheet Metal. Bumpers. Headlamps. Inspect headlamps for: Tail Lamps. Inspect tail lamps for: Stop Lamps. Inspect stop lamps for: Turn Signal Lamps. Inspect turn signal lamps for: Hazard Warning Lamps. Inspect hazard warning lamps for: Side Marker Lamps. Side marker lamps may function as both side marker and clearance lamps. Inspect side marker lamps for: Clearance Lamps. Clearance lamps are not required on vehicles less than 80 inches in width. Inspect clearance lamps for: Identification Lamps. Identification lamps are not required on vehicles less than 80 inches in width. Inspect identification lamps for: License Plate Lamp or Lamps. Inspect license plate lamp or lamps for: Additional Lamps (if Equipped). Instrument and Indicator Lamps. Inspect for presence and function of: Reflectors. Wiring. Visually inspect wiring for: Battery. Visually inspect battery for: Switches. Roadside Warning Devices. Each vehicle shall be equipped with three bidirectional emergency reflective triangles. Inspect bidirectional emergency reflective triangles for: Extinguisher. Vehicles used to transport hazardous materials shall be equipped with a fire extinguisher with an Underwriters Laboratory rating of at least 10 BC. Vehicles used to transport nonhazardous materials shall be equipped with at least one fire extinguisher with an Underwriters Laboratory rating of at least 5 BC or two fire extinguishers with an Underwriters Fuses. Each vehicle using fused electric circuits shall be equipped with at least one spare fuse of each type and size of the fuses used in the vehicle. Seats. Visually inspect seat for: Seat Belts (Applicable to Vehicles Manufactured on and after January 1, 1965). Inspect seat belt for: Visually inspect visor for: Outside Mirrors. From driver's seat, inspect mirrors for: Inside Mirror (When Required). From driver's seat, inspect mirror for: Windshield. Visually inspect windshield for: Side Windows. Inspect for: Windshield Wipers. Inspect windshield wipers for: Windshield Washers (if Equipped). Defroster. Gear Selector. Neutral Safety Switch. Speedometer. Odometer/hubometer. Brake Pedal. Inspect brake pedal for: Clutch Pedal. Inspect clutch pedal for: Inspect for: Transportation Article, §§12-104(b) and 23-303, Annotated Code of Maryland Effective date: January 8, 1990 (16:26 Md. R. 2796) Regulation .01 amended effective April 1, 1991 (18:6 Md. R. 687) The standards, requirements, and procedures set forth in this chapter are applicable to equipment originally installed by the manufacturer or required by federal or State law or regulation on any vehicle registered as a Class G (freight trailer) vehicle under the provisions of Transportation Article, Title 13, Annotated Code of Maryland, or any freight trailer or semitrailer owned by this State or any political subdivision of this State. Compliance with these minimum requirements may not be sufficient for the equipment to remain in compliance for 12 months or 25,000 miles, whichever occurs first. Therefore, more frequent maintenance, service, and repair as deemed necessary by the owner is permitted and recommended. Axles, beams, spindles or mountings which are broken, damaged, worn, rusted, bent, or modified may affect wheel alignment, tracking, or vehicle handling or stability. Spring and Attachments. Unequal vehicle height, broken or damaged spring leaves, spring shackles, bushings, center bolts, U-bolts, control arms, torsion bars or equalizers can affect vehicle steering, alignment, tracking, handling, and stability. With vehicle on a level surface, inspect: Torsion Bar. All other suspension components shall be inspected the same as leaf spring suspension. Coil Springs and Mountings. Visually inspect coil springs, control arms, rear torque arms, axle strut (when equipped), and front and rear stabilizer bar (when equipped). Rubber Load Cushions. All other suspension components shall be inspected the same as leaf spring suspension. Tandem Axle Walking Beams. Sliding Bogie. Air Suspension (All Axles). Two procedures are required to inspect air suspension systems. Air Suspension. Inspection is conducted with normal air pressure in suspension system. Shock Absorbers (if Equipped). Shock absorber inspection includes leakage, mounting, and all related attachments. When originally equipped with shock absorbers, inspect for: Road Clearance. Brake Lines and Hoses. Visually inspect: Vacuum System. Drum Brakes—Hydraulic. Disc Brakes—Hydraulic. Brake Lines and Hoses—Hydraulic. Air Leakage. Inspection for leakage shall be conducted with a fully charged system and brakes fully applied. Air Reservoir and Valves. Parking and Emergency Brake Application. Vehicles with original equipment air-operated parking brakes are permissible. There are different systems designed for automatic or manual operation of the system as the design allows (check automatic application of brakes when air tanks are being drained). Gladhands and Air System. Brake Mechanical Components. Do not attempt to dismantle a double diaphragm spring brake unit while it is on the vehicle. Utilize a safety cage and remove the entire unit from the vehicle. Replace with a new or rebuilt assembly. When rebuilding or overhauling a brake chamber, strict adherence to manufacturer's procedures is required. Inspect brake chamber for: Slack Adjuster (Push Rod) Travel. With the assistance of a second party, apply 85 psi in system and note rod travel. Wedge Brake. With the assistance of a second party, make a full brake application. Brake Camshafts. Brake Linings—Air Brakes. Visually inspect brake shoes. If shoes cannot be seen, removal of the lower portion of the dust cover is required. Brake Drums—Air Brakes. Disc Brakes—Air. Brakes—Electric. Break Away (Emergency Brake). Tire Inspection—Nonsteering Axle. Wheels. Visually inspect: Rims. Visually inspect for: Lock Rings. Studs, Nuts, and Clamps. Inspect for: Frame. Frame Cross Members. Body Mounts. Floors (if Applicable). Doors, Handles, Latches, and Hinges. Landing Gear (if Applicable). Rear Protector (Mud) Flaps. Rear protector flaps are not required on a vehicle when the construction is such that complete freedom around the wheel Sheet Metal. Rear Metal Frame. Each trailer and semitrailer, when operated on the highways, shall be equipped with a permanent metal frame attached to the underside of the rear of the trailer. The frame may not be wider than the width of the trailer and more than 30 inches above the highway, and shall be constructed of heavy gauge steel. The maximum The maximum transverse distance from the widest part of the vehicle at the rear to the frame may not exceed 18 inches. Any trailer or semitrailer so constructed and maintained that the body, chassis, or other parts afford the required protection is in compliance with this regulation. This regulation does not apply to pole trailers or trailers or semitrailers when the installation of the frame would prevent operation of the vehicle in fulfilling its designed use. The frame may not interfere with lights or other warning devices. Inspect rear metal frame for: Tail Lamps. Inspect tail lamps for: Stop Lamps. Inspect stop lamps for: Turn Signal Lamps. Inspect turn signal lamps for: Hazard Warning Lamps. Inspect hazard warning lamps for: Side Marker Lamps. Side marker lamps may function as both side marker and clearance lamps. Inspect side marker lamps for: Clearance Lamps. Clearance lamps are not required on vehicles less than 80 inches in width or on rear of truck tractors. Inspect clearance lamps for: Identification Lamps. Identification lamps are not required on vehicles less than 80 inches in width. Inspect identification lamps for: License Plate Lamp or Lamps. Inspect license plate lamp or lamps for: Additional Lamps (if Equipped). Reflectors. Wiring. Visually inspect wiring for: Upper Fifth Wheel Plate. Kingpin. No-Slack Hitch. Apply air pressure to no-slack hitch before inspecting. Converter Dolly and Fifth Wheel Structure. Inspect: Trailer Hitches. Inspect hitch for: Secondary Attachments. Inspect for presence and condition of: Tanks. Inspect: Pressure Vessels. Inspect: Transportation Article, §§12-104(b) and 23-303, Annotated Code of Maryland Effective date: January 8, 1990 (16:26 Md. R. 2796)