Jeep 1979 CJ-5 Technical & Service Manual page 605

2G-12 BRAKES
Service Diagnosis-Disc Brakes (Continued)
Condition
Possible Cause
Correction
(2) Restrictions in brake lines or
hoses.
(3) Incorrect parking brake adjust-
ment.
(4) Rear shoes n o t returning t o nor-
mal position.
GRABBING BRAKES
PULLS WHEN BRAKES
ARE APPLIED
(5) Caliper pistons n o t releasing. Pis-
tons stuck due t o piston scoring
or corrosion or piston cocking in
bore.
(6) Lines to combination valve in-
stalled incorrectly.
(7) Bind in brake pedal or power
unit bellcrank pivot pins (CJ
only)
(8) Check valve installed in master
cylinder outlet port.
(1) Refer to all conditions listed un-
der PULLS WHEN BRAKES ARE
APPLIED.
(2) Power brake unit malfunction or
bellcrank pivot pins binding (CJ
only).
(3) Combination valve malfunction.
(4) Incorrect power unit.
(1) Incorrect tire pressures.
(2) Mismatched tires on same axle.
(3) Wheel bearings misadjusted or
worn.
(2) Check for kinks or dents in steel
lines . Check rubber hoses for
swelling or restrictions inside
hose.
(3) Check and readjust t o specifi-
cation. Inspect cables for bind
or frayed conditions.
(4) Return springs weak. Shoes
dragging on support plate due
t o lack of lube or ridges on
support plate ledges. Wheel
cylinder cups swollen or pis-
tons sticking. Repair or re-
place faulty parts as required.
(5) Repair or replace pistons or
caliper as required.
(6) Check and correct as required.
Port marked inlet goes to mas-
ter cylinder; port marked
outlet goes t o calipers.
(7) Lube pedal pivot or pivot pins.
(8) Check outlet. Remove valve
if present. Bleed brakes.
(1) See PULLS WHEN BRAKES
ARE APPLIED.
(2) Check operation and replace or
repair as required. Refer t o
POWER UNIT SERVICE
DIAGNOSIS Chart.
(3) Replace valve and bleed system.
(4) Check and replace as required.
(1) Inflate to spec.
(2) Install equal size, type tires.
(3) Adjust or replace as required.
6 0 6 3 8 C