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2-6
GROUP
2-BRAKES
TAILE 1
DISC BRAKE TROUBLE SYMPTOMS AND POSSIBLE CAUSES
TROUBLE SYMPTOMS
J
EXCESSIVE PEDAL TRAVEL
EXCESSIVE BRAKE PEDAL EFFORT
BRAKE ROUGHNESS OR
CHAnER (PULSATING PEDAL)
BRAKES PULL, GRAB, OR
UNEVEN BRAKING
BRAKE RA nLE OR CLICK
GRINDING OR GRATING NOISE
POSSIBLE CAUSES
Pad knock-back from extremely
rough road operation or violent
cornering.
Incorrectly adjusted rear brakes.
Air in system, fluid leak, or low
fluid level.
Excessive wheel bearing end play.
Damaged and leaking caliper pis-
ton seal.
Incorrectly ground rear brake
lining.
Brake shoe not to flat surface
specification limit.
Booster linlt not connected to
brake pedal.
Brake booster not connected to
firewall.
Detective master cylinder seals.
Brake booster malfunction.
Brake booster check valve leaking.
Vacuum failure.
Brake fluid, oil or grease on brake
linings.
Stuck or seized pistons in both
calipers.
Brake rotor excessive lateral run-
out or thickness variation.
Rear brake drum ovality excessive.
Unequal front tyre pressures.
Incorrect front end alignment.
Brake fluid, oil or grease on brake
linings.
Caliper not properly aligned on
rotor.
Stuck or seized piston one caliper.
Broken or missing shoe hold-down
spring or clip.
Worn or cut insulators or broken
stabilizers.
Worn out lining.
Damaged insulator or stabilizer.
Damaged wheel bearings.
CORRECTION
Check for worn or damaged insu-
lators or damaged stabilizers and
replace as necessary.
Check automatic adjusters.
Bleed system, correct leak and fill
hydraulic system.
-
Adjust wheel bearings to speci-
fications.
Replace piston seal, fill and bleed
hydraulic system.
Grind or replace rear brake shoe
and lining assemblies.
Replace brake shoe and lining
assembly.
Connect booster
link to brake
pedal.
Secure brake booster to firewall.
Overhaul or replace master cyl-
inder.
Replace \>rake booster assembly.
Replace check valve.
Check hose and connections.
Replace brake linings. Clean rotor
with alcohol.
Free up pistons and replace piston
seals.
Replace brake rotor.
Refinish or replace rear brake
drum.
Equalize tyre pressures.
Align front end and check toe-in.
Replace brake linings. Clean rotor
with alcohol.
Align and tighten anchor plate
bolts in correct sequence to specified
torque.
Free up or replace piston and
piston seal.
Replace broken or missing parts.
Replace broken or damaged parts.
Replace lining.
Replace damaged part.
Replace with new bearings.
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