Condition
Excessive pedal travel
(Pedal stroke too
large)
Possible cause
1. Partial brake system failure
2. Insufficient fluid in master
cylinder reservoirs
Correction
Check diagonal brake systems and
repair as necessary
Fill reservoirs with approved brake
fluid. Check for leaks and air in
brake systems. Check warning light.
Bleed system if necessary.
3. Air in system (Pedal soft/spongy)
Bleed system
4. Rear brake system not adjusted
Adjust rear brakes (Repair auto
(malfunctioning auto adjusting
adjusting mechanism)
mechanism)
5. Bent brake shoes
Replace brake shoes
6. Worn rear brake shoes
Replace brake shoes
.
Dragging brakes (A
very light drag is pre-
sent in all disc brakes
immediately after
pedal is released)
1. Master cylinder pistons not
returning correctly
2. Clogged return port in master
cylinder
3. Restricted brake tubes or hoses
4. Incorrect parking brake
adjustment
5. Weakened or broken return
springs in the brake
Repair master cylinder
Clean
Check for soft hoses or damaged tubes
and replace with new hoses and/or
new double-walled steel brake tubing
Check and adjust to correct specifica-
tions
Replace
6. Sluggish parking-brake cables or
linkage
Repair or replace
7. Wheel cylinder or caliper piston
sticking
Repair as necessary
Pedal pulsation
1. Damaged or loose wheel bearings Replace wheel bearings
(Pedal pulsates when
2. Excessive disc lateral runout Check per instructions. If not within
depressed for braking)
specifications, replace or machine the
disc.
3. Parallelism not within specifica- Check per instructions. If not within
tions
specifications, replace or machine the
disc.
4. Rear drums out of round
Check runout.
Braking noise
1.
Glazed shoe linings, or foreign
Repair or replace shoe lining
matters stuck to linings
2. Worn or distorted shoe linings
Replace shoe lining (or pad)
3. Loose front wheel bearings
Replace wheel bearings
4. Distorted backing plates or loose
Replace or retighten securing bolts
mounting bolts
2-13
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