36
TROUBLE
ANAL
YSIS
Trouble Analysis for Air Brakes (continued)
Trouble
Probable Cause
Corrective Action
Excessive leakage with emergency
Defective relay emergency valve.
Clean and repair, or replace valve.
system only applied - no leakage
with normal brake application.
Excessive water present in
Reservoir not drained often enough.
Drain reservoir daily.
brake system.
Excessive oil present in
Compressor on towing vehicle
Repair compressor.
brake system.
passing excessive oil.
Brake will not apply.
Flat spot on cam roller or camshaft.
Replace defective parts.