Table 4-2. Organizational Troubleshootlng (Con't).
TEST OR INSPECTION
Check lubrication of handbrake lever and linkage.
BRAKES WILL NOT RELEASE (OVERHEAT).
Check for missing or damaged preformed packings in air couplings.
Check for restrictions in or damage to air lines.
Remove restrictions or replace damaged air lines (para 4-39).
With trailer coupled to towing vehicle, check for air being released from relay valve when towing
vehicle brakes are released.
If air is not released from relay valve, replace (para 4-40).
Check for a weak or broken brakeshoe return spring (para 4-29).
NO BRAKES OR WEAK BRAKES.
Check level of brake fluid in master cylinder.
Check for clogged air filter elements.
Check for leaks in hydraulic brake system.
Check for air in hydraulic brake system.
Check for scored brakedrum.