# COMAR Title 11 — Department of Transportation

## Subtitle 22 — Motor Vehicle Administration —Preventive Maintenance Program

### Chapter 04 — Preventive Maintenance Standards for Freight Trailers and Freight Semitrailers

#### Regulation .03 Suspension.

*COMAR 11.22.04.03*

A. 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:

B. Torsion Bar. All other suspension components shall be inspected the same as leaf spring suspension.

C. 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).

D. Rubber Load Cushions. All other suspension components shall be inspected the same as leaf spring suspension.

E. Tandem Axle Walking Beams.

F. Sliding Bogie.

G. Air Suspension (All Axles). Two procedures are required to inspect air suspension systems.

H. Air Suspension. Inspection is conducted with normal air pressure in suspension system.

I. Shock Absorbers (if Equipped). Shock absorber inspection includes leakage, mounting, and all related attachments. When originally equipped with shock absorbers, inspect for:

J. Road Clearance.