Front Disc Brake Pads Replacement
Removal Procedure
Caution: Two different designs of the front brake rotors and front brake pads are used on this vehicle. Do NOT interchange first design and second design parts, or a loss of braking and personal injury could occur.
Caution: Refer to Brake Dust Caution in Cautions and Notices.
Inspect the fluid level in the brake master cylinder reservoir.
If the brake fluid level is midway between the maximum-full point and the minimum allowable level, then no brake fluid needs to be removed from the reservoir before proceeding. If the brake fluid level is higher than midway between the maximum-full point and the minimum allowable level, then remove brake fluid to the midway point before proceeding.
Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
Remove the tire and the wheel assembly. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
Hand tighten 2 wheel lug nuts in order to retain the rotor to the hub.
Compress the front caliper piston.
6.1. Install a large C-clamp (2) over the top of the caliper housing (1) and against the back of the outboard pad.
6.2. Slowly tighten the C-clamp (2) until the piston pushes into the caliper bore enough to slide the caliper (1) off the rotor.
6.3. Remove the C-clamp from the caliper.
Remove the lower caliper bolt (1).
Notice: Use care to avoid damaging pin boot when rotating caliper.
Notice: 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.
In order to access the pads, rotate the caliper upward and suitably support it.
Remove the pads (5) from the caliper bracket (3).
Remove the 2 retainer slides (4) from the caliper bracket (3).
Inspect the following parts for cuts, tears, or deterioration. Replace any damaged parts:
†The disc brake mounting and hardware -- Refer to Disc Brake Mounting and Hardware Inspection - Front .
†The caliper dust boot -- Refer to Brake Caliper Inspection .
Inspect the caliper bolts (1) for corrosion or damage. If corrosion is found, use new caliper bolts when installing the caliper.
Installation Procedure
Using a C-clamp, bottom the piston into the caliper bore. Use an old brake pad or wooden block across the face of the piston. Do not damage the piston or the caliper boot.
Install the 2 retainers to the caliper bracket.
Important: The wear sensor is on the outside pad. The sensor is positioned at the leading or upward edge of the pad during forward wheel rotation.
Install the pads (5) to the caliper anchor bracket (3).
Notice: Use care to avoid damaging pin boot when rotating caliper.
Remove the support and reposition the caliper (2) back down over the front pads.
Lubricate the pin bolt and the inner diameter of the bolt boot with GM P/N 18047666, or equivalent. Do not lubricate the threads of the pin bolt.
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Install the lower caliper bolt.
Tighten
Tighten the caliper bolts to 95 NÂ m (70 lb ft).
Remove the 2 wheel lug nuts retaining the rotor to the hub.
Install the tire and the wheel assembly. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
Lower the vehicle.
With the engine OFF, gradually apply the brake pedal to approximately 2/3 of its travel distance.
Slowly release the brake pedal.
Wait 15 seconds, then repeat steps 10 and 11 until a firm brake pedal is obtained. This will properly seat the brake caliper pistons and brake pads.
Fill the brake master cylinder reservoir to the proper level. Refer to Master Cylinder Reservoir Filling in Hydraulic Brakes.
Burnish the pads and rotors. Refer to Brake Pad and Rotor Burnishing .
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Tuesday, February 9th, 2021 AT 9:54 AM
