BRAKE SYSTEM TROUBLESHOOTING

TM 9-2320-303-24-1

BRAKE SYSTEM TROUBLESHOOTING

0012 00

THIS WORK PACKAGE COVERS

Brake System Troubleshooting Procedures

INITIAL SETUP

Maintenance Level

Tools and Special Tools

Unit

Tool kit, general mechanic's (Item 102, WP 0313

00)

Table 1. Brake System Troubleshooting Procedures.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Vehicle Does Not Slow Down Quickly Enough 1. Check for proper lubrication.

Lubricate brake system (WP 0024

When Brakes Are Applied.

00); adjust brakes.

2. Check for heat-damaged or Replace any damaged or glazed

glazed brakeshoe linings.

brakeshoes (all brakeshoes must

be replaced on an axle) (WP 0122

00 or WP 0124 00).

3. Check brake drums for Replace damaged brake drums

excessive heat damage, cracks, (WP 0263 00).

scoring, and out-of-roundness.

4. Check for faulty air chambers. Replace faulty air chamber(s)

(WP 0123 00 or WP 0125 00).

5. Check for air pressure leakage Replace air compressor (WP 0302

to air chambers.

00).

Brakes Do Not Release or Release Too Slowly. 1. Check for proper lubrication of Lubricate brake system (WP 0024

brake system.

00).

2. Check that foot valve returns to Remove any debris interfering

fully released position.

with pedal travel or adjust stop

bolt (WP 0126 00).

3. Check exhaust ports on foot Clear obstructions from exhaust

brake valve, quick release port(s) and vents (WP 0146 00,

valve, and gladhand vent holes WP 0147 00, and WP 0148 00).

for blockage.

4. Check for weak and broken Replace weak or broken springs

brakeshoe return springs.

(WP 0122 00 or WP 0124 00).

5. Check for frozen brakeshoe Clean and lubricate sticking pins

anchor pins.

or replace pins if damaged (WP

0122 00 or WP 0124 00).

0012 00-1