Rear Disc Brake Pads Replacement J55
Removal Procedure
- Remove two-thirds of the brake fluid from the master cylinder.
- Raise the vehicle and suitably support. Refer to
Lifting and Jacking the Vehicle
in General Information.
- Mark the relationship of the wheel to the axle flange.
- Remove the Wheel. Refer to
Tire and Wheel Removal and Installation
in Tires and Wheels.
Important: Do not use a screwdriver or pry bar to compress the caliper piston into
the caliper. Any damage to the piston boot could cause corrosive element to
enter the piston sealing area and lead to the piston seizing in the caliper
bore.
- Using a large C clamp compress the caliper piston into the caliper bore
completely.
- Remove the lower caliper
slide pins.
- Remove the caliper from
the anchor and support.
- Remove the inboard and
outboard pads from the anchor bracket.
- Remove and inspect the
pad retainers.
Important: Inspect the caliper bolt suspension boots for cuts, tears, or deterioration.
If damaged, replace the pin boots. Refer to
Brake Caliper Bracket Overhaul
. Inspect the piston boot for deterioration.
If damaged. Refer to
Rear Brake Caliper Overhaul
.
Inspect the caliper pin bolt for damage or corrosion. Replace if damaged
or corroded. Do not attempt to clean away corrosion. Corrosion is typically
caused by damaged pin boots.
Installation Procedure
- Install the brake pad
retainers into the caliper anchor bracket.
- Install both brake pads
into the caliper anchor bracket.
- If new brake pads are
being installed in the vehicle it may be necessary to bottom the caliper piston
completely into the caliper bore. Use a large C clamp and compress the piston
into the caliper bore.
Important: The caliper piston boot must lay flat. Make sure convolutions are tucked
into place.
- Use a small plastic or wooden tool (1) to lift the inner edge of the
boot next to the piston (2), and press out any trapped air.
- Install the caliper down
over the brake pads and onto the anchor bracket.
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.
- Insert the caliper
slide pins.
Tighten
Tighten the caliper slide pin to 85 N·m (63 lb ft).
- Install the tire and wheel assembly. Refer to
Tire and Wheel Removal and Installation
in Tires and Wheels.
- Lower the vehicle.
- Start the vehicle and apply approximately 778 N·m(175 lb ft.)
of force three times to the brake pedal to seat the brake caliper piston and
brake pads.
- Burnish the pads and rotors. Refer to
Brake Pad and Rotor Burnishing
.
Rear Disc Brake Pads Replacement Without J55
Removal Procedure
- Remove two-thirds of the brake fluid from the master cylinder.
- Raise the vehicle and suitably support. Refer to
Lifting and Jacking the Vehicle
in General Information.
- Mark the relationship of the wheel to the hub flange.
- Remove the Wheel. Refer to
Tire and Wheel Removal and Installation
in Tires and Wheels.
Important: Do not use a screwdriver or pry bar to compress the caliper piston into
the caliper. Any damage to the piston boot could cause corrosive elements
to enter the piston sealing area and lead to the piston seizing in the
caliper bore.
Important: Do not exceed more than 1 mm of piston travel. Damage to the
internal adjusting mechanism may result.
- Using a large C clamp compress the piston into the caliper until resistance
is felt, but no more than 1 mm of piston travel in order to gain
enough clearance to allow the caliper to pivot off the caliper bracket.
- Disconnect the park brake
cable (1) from the brake caliper.
- Remove the bottom caliper slide pin.
- Pivot the caliper body
(6) upward.
- Remove the inboard (2) and outboard (3) pads from the anchor bracket
(5).
- Remove and inspect the pad retainers (1).
Important: Inspect the caliper bolt suspension boots for cuts, tears, or deterioration.
If damaged, replace the pin boots. Refer to Caliper Bracket Overhaul. Inspect
the piston boot for deterioration. If damaged, Refer to Caliper overhaul.
Caliper pin bolt for damage or corrosion. Replace if damaged or corroded.
Do not attempt to clean away corrosion. Corrosion is typically caused
by damaged pin boots.
Installation Procedure
Important: The electronic brake pad wear sensors must be replaced every time the
brake pads are replaced. New brake pad wear sensors are included with GM replacement
brake pad kits.
- Retract the caliper piston (2)
into the caliper bore. Use a spanner type wrench and turn the piston clockwise
until it bottoms out fully in the caliper and align the piston.
- Install the brake pad
retainers (1) into the caliper anchor bracket (5).
- Snap the brake pad wear sensor into the inboard brake pad.
- Install the inboard (2) and outboard (3) brake pads into the caliper
anchor bracket. Route the wear sensor wire through the caliper and support
properly to be sure the wire will lay in its proper location when the
caliper is installed.
Important: The caliper piston boot must lay flat. Make sure convolutions are tucked
into place.
- Use a small plastic or wooden tool (1) to lift the inner edge
of the boot next to the piston, and press out any trapped air.
- Pivot the caliper down
over the brake pads and into the anchor bracket. Be sure that the wear sensor
wiring is properly routed and clipped in its original location.
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.
- Insert the lower caliper slide pin.
Tighten
Tighten the caliper slide pin to 26 N·m (20 lb ft).
- Connect the park brake
cable (1) to the brake caliper (2).
- Install the tire and wheel assembly. Refer to
Tire and Wheel Removal and Installation
in Tires and
Wheels.
- Lower the vehicle. Refer to
Lifting and Jacking the Vehicle
in General Information.
- Adjust the brake fluid level.
- Start the vehicle and apply approximately 778 N (175 lb)
of force three times to the brake pedal to seat the brake caliper piston
and brake pads. This helps to seat the brake caliper and pads.
- Recheck the brake fluid level.
- Burnish the pads and rotors. Refer to
Brake Pad and Rotor Burnishing
.