Brakes
INSUFFICENT BRAKE ACTION
CAUSE REMEDY
Improper brake shoe adjustment Adjust brake shoes
Worn brake linings Adjust for lining wear or replace brake shoes
Blocked, bent, or broken tubing or hose Remove obstructions in line or replace faulty
tubing
Brake valve delivery pressure below normal Clean and replace worn parts if brake valve
is defective, replace unit
Insufficient parking brake valve delivery
pressure
Clean and replace worn parts, or if valve is
defective, replace unit
BRAKES RELEASE TOO SLOWLY WITH PEDAL RELEASED
CAUSE REMEDY
Insufficient brake shoe clearance Adjust brake shoes
Weak or broken valve diaphragm return
spring
Replace brake valve
Relay or quick-release valve exhaust ports
obstructed
Clean or replace faulty unit
ONE BRAKE DRAGS WITH PEDAL RELEASED
CAUSE REMEDY
Insufficient brake shoe clearance Adjust brake shoe clearance
Brake shoe binding on anchor pin Remove shoe, clean and lubricate anchor
pins.
Weak or broken brake shoe return springs Replace faulty spring
BRAKES ACT UNEVENLY OR GRAB WHEN PEDAL IS DEPRESSED
CAUSE REMEDY
Brake shoe clearance is too great Adjust clearance
Grease or oil on linings Clean linings or replace linings or shoe
assemblies
Drums out of round Replace drum
Defective brake valve Replace faulty unit
Brakes need relining Replace brake shoes
Brake chamber diaphragm leaking Tighten all fittings; if caused by broken or
faulty unit, replace the unit
T300-1_T500-1_T780
Troubleshooting
402 P/N 12261-683
REVISED: January 2015
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