# COMAR Title 11 — Department of Transportation

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

### Chapter 02 — Preventive Maintenance Standards for Trucks and Truck Tractors

#### Regulation .05 Brake Systems—Hydraulic and Vacuum.

*COMAR 11.22.02.05*

A. Parking Brakes.

B. Brake Lines and Hoses. Visually inspect:

C. Brake Failure Indicators. Visually inspect:

D. 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:

E. 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.

F. Vacuum System.

G. Power Brake Operation.

H. Vacuum Reserve.

I. Vacuum Pump (if Applicable).

J. Drum Brakes—Hydraulic.

K. Disc Brakes—Hydraulic.

L. Brake Lines and Hoses—Hydraulic.

M. Master Cylinder. Visually inspect master cylinder for: