38
MAINTENANCE
Trouble
Probable Cause
Corrective Action
Insufficient brakes.
Brakes need adjustment.
Adjust brakes.
Brakes need lubrication.
Lubricate brakes.
Lining worn away.
Reline brakes.
Defective relay emergency valve.
Repair or replace valve.
Brakes overheated.
Stop and allow to cool. Locate the cause
of overheating.
Low air pressure.
Troubleshoot tractor air system.
Brakes grabbing.
Lubricant on brake lining.
Reline brake.
Brake components binding.
Locate cause and repair, adjust or replace
components.
Defective brake valve on towing
Repair or replace valve.
vehicle.
Defective relay emergency valve.
Repair or replace valve.
Excessive leakage with
Relay emergency valve leaking.
Repair or replace valve.
brakes released.
Leaking tubing or hose line.
Tighten or replace leaking lines.
Excessive leakage with
Relay emergency valve leaking.
Repair or replace valve.
brakes applied.
Leaking brake chamber or
Tighten clamp ring or replace diaphragm.
diaphragm.
Leaking tubing or hose line.
Tighten or replace leaking lines.
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
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.
Trouble Analysis for Brakes (continued)
