Group 23, Brake System
23-2-2 • Service Brake Troubleshooting SM 765, Sep ’06
Service Brake Troubleshooting
Causes/Corrective
Condition Actions
Brake pedal drops to floor .................................................................................................................... A C E
Brake pedal spongy ................................................................................................................................. A B
Brakes stick, drag excessively, make noise, or overheat ...................................................................... D E F
Excessive effort required to apply brake ................................................................................................. A E
Causes/Corrective Actions
A. External leak in wheel cylinder or other component of braking system ............. Inspect/replace/repair.
B . Air in braking system ............................................................................................... Bleed and recheck.
C . Linkage broken or return spring damaged ....................................................................... Inspect/repair.
D. Brake master cylinder defective ..................................................................Inspect/overhaul or replace.
E . Brake disc. worn or brakes misadjusted................................................................ Inspect/repair/adjust.
F . Parking brake misadjusted........................................................................................................... Adjust.
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