Front Disc Brake Linings (Pads)

FRONT DISC BRAKE LININGS (PADS)

REMOVAL

CAUTION: MAKE SURE VEHICLE IS PROPERLY SUPPORTED AND SQUARELY POSITIONED ON THE HOIST. TO HELP AVOID PERSONAL INJURY WHEN A VEHICLE IS ON A HOIST, PROVIDE ADDITIONAL SUPPORT FOR THE VEHICLE ON THE OPPOSITE END FROM WHICH COMPONENTS ARE BEING REMOVED.

1. Raise vehicle on hoist.
2. Remove front wheel and tire assemblies.
3. Remove lower caliper bolt.





4. Pivot caliper body up, around upper guide pin.





5. Remove inboard and outboard brake pads from caliper support bracket.





6. Measure lining thickness with a steel rule.

IMPORTANT: Measurement is of lining material only, and does not include the backing plate.

Discard Thickness: 2.0 mm (0.080 inch)

NOTICE: Replace front pads as a set if any pad has a thickness at or less than the Discard Thickness, or if any pad has severe, uneven wear.





7. Remove two pad clips from caliper support bracket.
8. Inspect caliper:
8.1 Lock pin and guide pin boots for deterioration. If damaged, replace.
8.2 Piston boots for deterioration. If damaged, replace caliper.
8.3 Lock pin for damage or corrosion. Replace if damaged or corroded (do not attempt to clean away corrosion).

9. Repeat steps 3 through 8 for opposite side of vehicle.

INSTALLATION

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

IMPORTANT: Leave pad in to compress caliper pistons.





1. Using a C-clamp, bottom pistons all the way into caliper bore.

IMPORTANT: Boots must lie flat, below the level of the piston face.

NOTICE: Make sure the brake pads move freely in the caliper brackets when the brakes are assembled.

IMPORTANT: Remove all rust and corrosion from the caliper brackets and the spring clips when installing brake pads. If reusing brake pads, remove all rust and corrosion from the ends of the brake pads and from notch in caliper support bracket. Be sure to install reused pads in their original positions. Using a small amount of Molykote grease, apply lubricant to the four notched areas of the caliper bracket. The lubricant should be applied to the caliper brackets behind the spring clips only. Make sure the brake pads move freely in the caliper brackets when the brakes are assembled.





2. Install new pad clips into caliper support.

NOTICE: Install the linings so the wear sensors are at the top of the caliper bracket. When the linings are installed properly, forward rotation of the rotor will first pass the sensor and then the lining.





3. Install inner and outer brake pads into caliper Support.

NOTICE: Be careful not to damage guide pin boot.

IMPORTANT: Compress guide pin by hand as caliper moves into position.





4. Pivot caliper body on upper guide pin, down onto the caliper support.

IMPORTANT: Check position of pad clips. If necessary, use a small screwdriver to re-seat or center the pad clips on the support. Make sure brake pads move freely in the caliper bracket. Make sure caliper moves freely on the guide pins.





5. Install caliper bolt.
Torque:
Caliper Bolt: 32 Nm (24 ft. lbs.)

6. Repeat steps 1 through 5 for opposite side of vehicle.

NOTICE: 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.

7. Position wheel onto hub.
8. Install wheel nuts and tighten in a crisscross pattern. Repeat tightening pattern to be sure torque is correct.
Torque:
Wheel Nut: 125 Nm (92 ft. lbs.)

9. Lower vehicle from hoist.

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

10. Prior to operating vehicle, depress the brake pedal several times until brake pads are fully seated against rotor.