Front Disc Brake Pads Replacement (JH5)
Front Disc Brake Pads Replacement (JH5)
Warning: Refer to Brake Dust Warning Brake Dust Warning.
Note: Always replace disc brake pads in axle sets.
Removal Procedure
1. Inspect the fluid level in the brake master cylinder reservoir.
2. If the fluid level is midway between the maximum-full point and the minimum allowable level, no fluid needs to be removed from the reservoir before proceeding.
3. If the fluid level is higher than midway between the maximum-full point and the minimum allowable level, remove fluid to the midway point before proceeding.
4. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle Service and Repair.
5. Remove the tire and wheel assembly. Refer to Tire and Wheel Removal and Installation Service and Repair.
6. Compress the brake caliper pistons.
1. Install 2 large C-clamps over the top of the caliper housing and against the back of the outboard pad.
2. Slowly tighten the C-clamps until the pistons are pushed completely into the caliper bores.
3. Remove the C-clamps from the caliper.
Note:
* DO NOT use any air tools to remove the guide pin bolts. Use hand tools ONLY.
* Install an open end wrench to hold the caliper guide pin in line with the brake caliper while removing or installing the caliper guide pin bolt. DO NOT allow the open end wrench to come in contact with the brake caliper. Allowing the open end wrench to come in contact with the brake caliper will cause a pulsation when the brakes are applied.
7. Using an open end wrench to hold the guide pin, loosen the brake caliper guide pin bolt.
8. Remove the lower brake caliper guide pin bolt (1).
Caution:
Support the brake caliper with heavy mechanic wire, or equivalent, whenever it is separated from its mount and the hydraulic flexible brake hose is still connected. Failure to support the caliper in this manner will cause the flexible brake hose to bear the weight of the caliper, which may cause damage to the brake hose and in turn may cause a brake fluid leak.
Note: DO NOT disconnect the flexible brake hose from the brake caliper.
9. Rotate the brake caliper (2) upward until it rests on the brake caliper mounting bracket and support with heavy mechanics wire or equivalent.
Note: If installing the original brake pads, mark the position of the inner and outer brake pads for proper installation.
10. Remove the brake pads (3).
Note:
* If installing the original brake pads and spring clips, mark the position of the pads and spring clips for proper installation.
* If installing new brake pads, install new pad spring clips. Do not reuse the old brake pad spring clips with new brake pads.
11. Remove the brake pad spring clips (4) from the mounting bracket (5).
12. Thoroughly clean the pad hardware mating surfaces of the caliper bracket of any corrosion or debris with denatured alcohol and allow to dry.
Note: Use care when cleaning the brake caliper pistons to avoid damaging the piston dust seals.
13. If installing new brake pads, thoroughly clean the brake caliper piston faces and caliper housing to brake pad contact surfaces of all disc brake pad insulator adhesive residue with denatured alcohol and allow to dry.
Installation Procedure
1. Apply a very thin coating of high temperature silicone brake lubricant to the pad mating surfaces of the caliper bracket only.
2. Install the spring clips (4) to the mounting bracket.
* Install the NEW spring clips if replacing the brake pads.
* Install the original spring clips in their original position if installing the original brake pads.
3. If installing new brake pads, remove the adhesive backing paper from the brake pad insulators.
Note: If installing the original brake pads, position the brake pads as marked during the removal procedure.
4. Install the brake pads (3).
5. Rotate the brake caliper (2) into the proper position on the mounting bracket (5).
Caution: Refer to Fastener Caution Fastener Caution.
Note:
* DO NOT use any air tools to remove or tighten the guide pin bolts. Use hand tools ONLY.
* Install an open end wrench to hold the caliper guide pin in line with the caliper while removing or installing the caliper. DO NOT allow the wrench to come in contact with the brake caliper. Allowing the wrench to come in contact with the brake caliper will cause a pulsation when the brakes are applied.
6. Use an open end wrench to hold the caliper guide pin while tightening the brake caliper guide pin bolt to 100 Nm (74 lb ft).
7. Install the tire and wheel assembly. Refer to Tire and Wheel Removal and Installation Service and Repair.
8. Lower the vehicle.
9. With the engine OFF, gradually apply the brake pedal to approximately 2/3 of its travel distance.
10. Slowly release the brake pedal.
11. Wait 15 seconds, then repeat steps 9-10 until a firm pedal is obtained to properly seat the brake caliper pistons and pads.
12. Fill the brake master cylinder reservoir to the proper level with clean brake fluid, if necessary. Refer to Master Cylinder Reservoir Filling Master Cylinder Reservoir Filling.
13. Firmly apply and maintain pressure on the brake pedal for 30 seconds to seat the brake pad insulators to the brake caliper pistons and caliper housing. Repeat this step 1 additional time.
14. Burnish the brake pads and rotors. Refer to Brake Pad and Rotor Burnishing Procedures.