Jeep 1987 Wrangler Workshop Manual page 983

BRAKE SYSTEM
DIAGNOSIS
K. CHATTER OR SHUDDER WHEN BRAKES ARE APPLIED - (Pedal pulsation and roughness
may also occur.)
POSSIBLE CAUSES
(1) Brakeshoes distorted, bent,
contaminated, or worn.
(2) Caliper anchor plate or support
plate loose.
CORRECTION
(1) Replace brakeshoes in axle sets.
(2) Tighten mounting bolts.
(3) Excessive runout or thickness variation (3) Refinish or replace rotors,
of disc brake rotors.
L. NOISY BRAKES — (Squealing, clicking, scraping sound when brakes are applied.)
POSSIBLE CAUSES
(1) Bent, broken, distorted brakeshoes.
(2) Rust on rotor braking surface.
(3) Worn brakelining — shoes contacting
drum or rotor.
(4) Broken or loose holdown or return
springs.
(5) Rough or dry drum brake support plate
(6) Cracked, grooved, or scored rotor(s) or
drum(s).
(7) Incorrect brakelining and/or shoes (front
or rear.)
CORRECTION
(1) Replace brakeshoes in axle sets.
(2) Refinish or replace rotor.
(3) Replace lining in axle sets. Refinish or
replace drums or rotors.
(4) Replace as necessary.
(5) Lubricate support plate ledges.
(6) Replace rotor(s) or drum(s). Replace
brakeshoes and lining in axle sets if
necessary.
(7) Install specified shoe and lining
assemblies.
101342M
M. PULSATING BRAKE PEDAL
POSSIBLE CAUSE
CORRECTION
(1) Out of round drums or excessive lateral (1) Refinish or replace as necessary,
runout in disc brake rotor(s).
S E E
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K-11