TM 1-1500-204-23-2
Table 4-41. Troubleshooting Wheel Brake Systems
Trouble
Probable Cause
Remedy
Brakes do not hold
Air in system.
Bleed system.
Leaks in system.
Check for leaks and tighten all
fittings.
Worn brake linings.
Replace brake linings as necessary.
Oil or grease on brake linings.
Replace brake linings as necessary.
Leak in master cylinder or power
Replace master cylinder or power
brake control valve.
brake control valve and bleed
system.
Brakes grab
Stones or other foreign matter
Clean brake disc brake linings.
locking brake disc
Warped or bent brake disc
Replace brake disc
Brakes will not release
Parking brake stuck.
Replace parking valve and bleed
system.
Blockage in master cylinder
Replace master cylinder or power
or power brake control valve
brake control valve and bleed
system.
Dragging brakes
Warped disc.
Replace disc.
Automatic adjusting mechanism
Replace adjusting mechanism or
faulty.
brake assembly.
Excessive force required on brake
Power-boost master cylinder in-
Replace power boost master
pedals of power-boost brake
operative
cylinder and bleed system
system to apply brakes
Excessively worn brake linings
Replace brake linings.
Failure of main or utility hydraulic
Check main or utility hydraulic
system pressure
system and correct defect
Parking brake will not hold
Air in system.
Bleed brakes
Defective parking brake valve.
Replace parking brake valve and
bleed system.
4-154
