Jeep Grand Cherokee WK. Manual — part 99
10. Push caliper mounting bolt bushings (3) out of the
boot seals (2) and remove the boot seals from the
caliper (1).
11. Remove caliper bleed screw.
CLEANING - DISC BRAKE CALIPER
Clean the caliper components with clean brake fluid or brake clean only. Wipe the caliper and piston dry with lint
free towels or use low pressure compressed air.
CAUTION: Do not use gasoline, kerosene, paint thinner, or similar solvents. These products may leave a
residue that could damage the piston and seal.
INSPECTION
The piston is made from a phenolic resin (plastic
material) and should be smooth and clean.
The piston must be replaced if cracked or scored. Do
not attempt to restore a scored piston surface by
sanding or polishing.
CAUTION: If the caliper piston is replaced, install
the same type of piston in the caliper. Never inter-
change phenolic resin and steel caliper pistons.
The pistons, seals, seal grooves, caliper bore and
piston tolerances are different.
The bore can be lightly polished with a brake hone
(3) to remove very minor surface imperfections. The
caliper should be replaced if the bore is severely cor-
roded, rusted, scored, or if polishing would increase
bore diameter more than 0.025 mm (0.001 inch).
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BRAKES - BASE - SERVICE INFORMATION
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ASSEMBLY
CAUTION: Dirt, oil, and solvents can damage cali-
per seals. Insure assembly area is clean and dry.
1. Lubricate caliper pistons, piston seals and piston
bores with clean, fresh brake fluid.
NOTE: Verify seal is fully seated and not twisted.
2. Install new piston seals (3) into caliper bores (2).
3. Lightly lubricate lip of new boot with silicone
grease. Install boot on piston and work boot lip into
the groove at the top of piston (3).
4. Stretch boot (2) rearward to straighten boot folds,
then move boot forward until folds snap into place.
5. Install piston (3) into caliper bore and press piston
down to the bottom of the caliper bore by hand or
with hammer handle.
6. Seat dust boot in caliper (2) with Handle C-4171
(1) and Installer (3):
•
54 mm caliper: Installer C-3716-A
7. Install the second piston and dust boot.
8. Lubricate caliper mounting bolt bushings, boot
seals and bores with Mopar brake grease or Dow
Corning
T
807 grease only.
CAUTION: Use of alternative grease may cause
damage to the boots seals.
9. Install the boot seals into the caliper seal bores
and center the seals in the bores.
10. Install mounting bolt bushings into the boot seals
and insure seal lip is engaged into the bushing
grooves at either end of the bushing.
11. Install caliper bleed screw.
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BRAKES - BASE - SERVICE INFORMATION
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INSTALLATION
FRONT DISC BRAKE CALIPER
1. Install the caliper (5) on the adapter (2).
2. Caliper slide pins should be free from debris and
lightly lubricated..
3. Install the caliper slide pin bolts (2) and tighten to
72 N·m (53 ft. lbs.).
4. Gently lift one end of the slide pin boot to equalize
air pressure, then release the boot and verify that
the boot is fully covering the slide pin.
CAUTION: Verify brake hose is not twisted or
kinked before tightening banjo bolt.
5. Install brake hose (5) to caliper (1) with new cop-
per washers (6) and tighten banjo bolt (6) to 31
N·m (23 ft. lbs.).
6. Fill and bleed brake system.
7. Install wheel and tire assemblies.
8. Remove supports and lower vehicle.
9. Verify brake fluid level.
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BRAKES - BASE - SERVICE INFORMATION
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REAR DISC BRAKE CALIPER
1. Install the brake pads.
2. Lubricate the slide pins and slide pin bushings with
caliper slide grease or the grease provided with the
caliper.
3. Install the caliper (1) on the anchor.
4. Install the caliper slide pin bolts (4) and tighten to
35 N·m (26 ft. lbs.).
CAUTION: Verify brake hose is not twisted or
kinked before tightening fitting bolt.
5. Install brake hose (3) to caliper with a new gasket
washers and tighten banjo bolt (5) to 31 N·m (23 ft.
lbs.).
6. Fill and bleed brake system.
7. Install wheel and tire assemblies.
8. Remove supports and lower vehicle.
FLUID
DIAGNOSIS AND TESTING
BRAKE FLUID CONTAMINATION
Indications of fluid contamination are swollen or deteriorated rubber parts.
Swollen rubber parts indicate the presence of petroleum in the brake fluid.
To test for contamination, put a small amount of drained brake fluid in clear glass jar. If fluid separates into layers,
there is mineral oil or other fluid contamination of the brake fluid.
If brake fluid is contaminated, drain and thoroughly flush system. Replace master cylinder, proportioning valve, cal-
iper seals, wheel cylinder seals, Antilock Brakes hydraulic unit and all hydraulic fluid hoses.
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BRAKES - BASE - SERVICE INFORMATION
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