Brake Pads Replacement - Rear

REMOVAL
^ Left side shown, right side opposite.

CAUTION: MAKE SURE VEHICLE IS PROPERLY SUPPORTED AND SQUARELY POSITIONED ON HOIST. TO HELP AVOID PERSONAL INJURY, PROVIDE ADDITIONAL SUPPORT TO THE OPPOSITE END OF THE VEHICLE THAT COMPONENTS WILL BE REMOVED FROM.

1. Raise vehicle on hoist.
2. Remove wheel corresponding to caliper being removed.





3. Remove lock pin and guide pin.





4. Remove caliper from caliper support, being careful not to damage pin boots.
5. Suspend caliper with safety wire.
6. Remove inboard and outboard brake pads from caliper support.
7. Remove two pad clips from caliper support.





8. Inspect:
a. Lock pin and guide pin boots for deterioration. If damaged, replace.
b. Piston boot for deterioration. If damaged, overhaul the caliper.
c. Lock pin for damage or corrosion. Replace if damaged or corroded (do not attempt to remove corrosion).

INSTALLATION

IMPORTANT: Never replace brake pads on one side of axle only. Left and right side brake pads must be replaced as axle sets.

Fig. 6 Rear Caliper Piston Installation:

1. Bottom piston in caliper bore using a brake piston driver tool (SA 91110NE or equivalent) in the piston slots. Rotate the piston clockwise, thereby threading the piston into its bore.





2. Position piston indentation slots as shown.





3. Lift inner edge of piston boot to release any trapped air. The boot must lie flat, below the level of the piston face.





4. Install new pad clips into caliper support.

IMPORTANT: Remove all rust and corrosion from the caliper brackets and the spring clips when installing brake pads. If installing used brake pads, remove all rust and corrosion from the ends of the brake pads and from the notch. Make sure the brake pads move freely in the caliper brackets when the brakes are assembled.

5. Install inner and outer brake pads into caliper support.

IMPORTANT:
^ The brake pad with the wear sensor is the outboard brake pad.
^ Make sure that the piston indentation slots are positioned correctly to accept the brake pads.

6. Install caliper body onto caliper support.

IMPORTANT:
^ Be careful not to damage lock pin or guide pin boots.
^ Compress pin boots by hand as caliper moves into position.

7. Lubricate straight sections (not threads) of lock pin and guide pin with silicone grease.





8. Install pins through caliper body into caliper support and torque to specification.
^ Torque: 36 Nm (27 ft. lbs.)

NOTICE:
^ Make sure lock pin boots are properly positioned before installing pins, or boot damage may occur.
^ Re-check position of pad clips. If necessary, use a small screw driver to re-seat or center the pad clips on the support.
^ Before installing wheels, remove rust or corrosion from wheel mounting surfaces and brake rotors/drums. Failure to do so can cause wheel nuts to loosen in service.

9. Position wheel onto hub.
10. Install wheel nuts and tighten in a crisscross pattern. Repeat tightening pattern to be sure torque is correct.
^ Torque: 140 Nm (103 ft. lbs.)

11. Lower vehicle from hoist.

CAUTION: IF THIS OPERATION IS NOT CARRIED OUT, BRAKES WILL NOT OPERATE DURING INITIAL BRAKE APPLICATIONS.

12. Prior to operating vehicle, depress brake a few times until brake pads are seated against rotor.