Jeep 1997 Grand Cherokee Service Manual page 185

PISTON BRAKE OUTBOARD SHOE CALIPER PISTON SURE OFF PRES- SEAL CALIPER HOUSING CYLINDER BORE
ZG
DESCRIPTION AND OPERATION (Continued)
Fig. 2 Brake Caliper Operation
Fig. 3 Lining Wear Compensation By PistonSeal
BRAKE HOSES AND LINES
Flexible rubber hose is used at both front brakes
and at the rear axle junction block. Double walled
steel tubing is used to connect the master cylinder to
the major hydraulic braking components and then to
the flexible rubber hoses.
DIAGNOSIS AND TESTING
BASE BRAKE SYSTEM
Base brake components consist of the brake shoes,
calipers, wheel cylinders, brake drums, rotors, brake
lines, master cylinder, booster, and parking brake
components.
Brake diagnosis involves determining if the prob-
lem is related to a mechanical, hydraulic, or vacuum
operated component.
The first diagnosis step is the preliminary check.
INBOARD SHOE DUST BOOT SEAL PISTON PISTON PRESSURE BRAKE SEAL PISTON BORE ON PARKING SOLID (NON-VENTILATED) ROTOR REAR CALIPER AND DRUM ASSEMBLY BRAKE SURFACE DRUM
Fig. 4 Rear Disc Brake Caliper Mounting
Fig. 5 Rear Disc Brake Rotor
PRELIMINARY BRAKE CHECK
(1) Check condition of tires and wheels. Damaged
wheels and worn, damaged, or underinflated tires
can cause pull, shudder, vibration, and a condition
similar to grab.
(2) If complaint was based on noise when braking,
check suspension components. Jounce front and rear
of vehicle and listen for noise that might be caused
by loose, worn or damaged suspension or steering
components.
(3) Inspect brake fluid level and condition. Note
that the front disc brake reservoir fluid level will
decrease in proportion to normal lining wear. Also
note that brake fluid tends to darken over time.
This is normal and should not be mistaken for
contamination.
(a) If fluid level is abnormally low, look for evi-
dence of leaks at calipers, wheel cylinders, brake
lines, and master cylinder.
(b) If fluid appears contaminated, drain out a
sample. System will have to be flushed if fluid is
CALIPER BRAKE DISC REAR MOUNTING BRACKET ROTOR
BRAKES 5 - 5