GM 19432941
Brake Pads, Front

A service technician should check the brake master cylinder reservoir fluid level before starting front disc Brake Pad replacement on j55 vehicles. A check of the fluid level reveals excessive fluid then drain the fluid until it reaches the midway point between maximum-full and minimum levels. Start by elevating the vehicle and marking the wheel position relative to the axle flanges before disassembly of tires and wheels. Apply a large c-clamp to the brake caliper body until the pistons compress enough to move beyond the brake rotor before removing the clamp. Support the caliper with heavy mechanic wire through its brake caliper pin bolts removal to avoid hydraulic flexible brake hose damage. Push the caliper vertically while keeping the hose connected before applying another large c-clamp using either a worn inner Brake Pad or wood piece to fully push the caliper pistons in. After removing the c-clamp and outdated Brake Pad or wood block you can proceed to take the inboard and outboard brake pads out of the caliper bracket to inspect the retainers. Examine the brake caliper bolt suspension boots for signs of damage which requires replacement while checking the brake caliper pin bolts for corrosion until replacement becomes necessary. Thoroughly inspect the piston boot and replace it if deteriorated. Elite the Brake Pad retainers into the caliper bracket before you drop the caliper down on new brake pads and apply high-temperature silicone lube to front brake caliper pin bolts. Fasten the lower brake caliper pin bolt before securing the caliper pin bolts to 113 n.m (83 lb ft). After reattaching the wheel assembly and lowering the car put away the engine then gently push and release the Brake Pedal until it reaches two-thirds of its usable range. Perform this procedure until the Brake Pedal feels firm enough to correctly align calipers with brake pads. Finish the procedure by adding the correct amount of fluid to the master cylinder reservoir before finally using the proper equipment to smooth the brake pads and rotors.

Begin by checking the brake master cylinder reservoir for fluid level before starting front Brake Pad replacement. The fluid level should be situated midway between markings on the brake master cylinder reservoir tank to avoid removal yet relocate it towards the midway if the level becomes excessive. Lift your vehicle while supporting its frame and remove the tire and wheel assembly from beneath the vehicle. When the hydraulic flexible brake hose stays connected to the caliper mount during service the technician needs to support the brake caliper with heavy mechanic's wire or equivalent until it separates from its mount to avoid damaging or leaking components. Separate the caliper from the mounting bracket keeping the hydraulic brake flexible hose intact before removing the brake pads from the caliper mounting bracket and eliminating the anti-rattle clips. The installation of anti-rattle clips must begin inside the caliper mounting bracket as well as inside the new brake pads while placing the inner pad-1 wear indicator and outer pad-2 wear indicators. After installing the brake caliper place the tire and wheel assembly back on then remove the safety stands before lowering the vehicle. Use the brake pedal gradually until you reach two-thirds of its extent and slowly let go of the pedal before repeating this procedure to achieve proper Brake Caliper Piston and Brake Pad seat. The last step involves adding pristine brake fluid at its specified measurements followed by rotor and Brake Pad surface smoothening.

Before working on the front brake pads of the 25/3500 series check the brake master cylinder reservoir fluid level first. If the level is halfway between marks you don't need to drain fluid but dispose it when it exceeds the midpoint. Use 2 big c-clamps to compress the brake caliper pistons while placing them on top of the caliper housing against the back of the outer pad until the pistons move completely into the brake caliper. Reduce brake power before you remove the brake caliper bolts to protect components from breaking. Mount the caliper on mechanic's wire without breaking the Brake Line connection and take out the brake pads while disposing of the old anti-rattle clips. Examine the caliper and bracket first to install new anti-rattle clips before putting on the disc brake pads. Make sure the pads sit correctly inside the 2500 series with wear sensor on the leading pad and the 3500 series. Secure the brake caliper into place and install its bolts by tightening them to 80 ft. Lbs. (108Nm). Put back the wheel parts and take out safety stands while lowering the vehicle down. Use the brake pedal three-fourths of its reach to set the caliper pistons without the engine running while cycling the pedal until brake control returns. To complete the service install clean brake fluid into the reservoir up to its specified mark and apply pressure to the brake pads and rotors through a burnishing procedure.

Before replacing 1500 series front brake pads inspect the brake master cylinder reservoir fluid. Keep the fluid level at midway between maximum and minimum if possible. Put the vehicle on stands then take out tire and wheel pieces. Push the brake caliper pistons completely back with two big c-clamps set above the housing then into the back of the outside pad. Use hand tools to work on the guide pin bolts while applying an open end wrench to support the caliper guide pin as you unscrew its lower bolt. Manual braking during rotor and caliper removal harms the system's components. After raising the caliper take the brake pads off the bracket and drop the anti-rattle clips. Insert fresh anti-rattle clips onto the caliper bracket before placing new brake pads onto it. Also install one indicator wear equipped inner pad. Lower the caliper back into its original position. Wrench-free tools help install the lower brake caliper guide pin bolt until it reaches 100 nm (74 ft. Lbs.) of torque. Make sure the brake caliper guide pin seal fits properly and make sure the guide pin slides without any hindrance through the caliper bracket. Install the tire and wheel unit and take out the safety stands before lowering the vehicle. Once the engine is shut down you should start pressing the brake until it reaches around two-thirds of travel and then let off gradually. Continue this sequence until you feel a solid brake pedal which presses the brake pistons and pads into the correct position. Complete the master cylinder reservoir using clean brake fluid when needed before performing pad and rotor surface polishing.

Check the brake master cylinder before starting work. If the fluid remains between the prescribed marks add nothing but lower the level when it sits above that range. First lift the vehicle and detach the wheel and tire set. Use heavy mechanics wire to hold up the brake caliper when you detach it from its mount to keep the hydraulic flexible hose safe during replacement. After detaching the hydraulic brake hose maintain the brake caliper connection and slide it out of its bracket. Extract the disc brake pads and discard the anti-rattle clips. Check the brake caliper unit parts for issues. Provide new anti-rattle clips to the mounting bracket then install the disc brake pads placing the inner pad with one wear indicator and the outer pad with two wear indicators. Replace the brake caliper and wheel parts one at a time before removing the safety stands while lowering the vehicle. Use the brake pedal to reach 2/3 of its movement before slowly releasing the pedal. Repeat this step until you achieve a solid brake feel to correctly position the brake caliper pistons and pads. After placing brake components back in place insert clean brake fluid into the reservoir to its correct amount then run the brake pads over the rotors to create a smooth braking surface.

Remove the C-clamp and the old brake pad or wood block, then take out the inboard and outboard brake pads from the caliper mounting bracket and inspect the brake pad retainers.

Secure the caliper and use another large C-clamp to fully compress the caliper pistons.

Install the brake pad retainers into the caliper bracket, pivot the caliper down over the new brake pads, and apply a thin coat of high-temperature silicone lube to the front brake caliper pin bolts.

Inspect the fluid level in the brake master cylinder reservoir; if the level is above midway, remove fluid to reach the midway point.

Inspect the caliper operation and use a C-clamp to slowly bottom the pistons of the caliper, repositioning as necessary.

Raise and support the vehicle, then remove the tire and wheel assembly.

Fill the brake master cylinder and burnish the brake pads and rotors.

Reduce it to the midway point.

Raise and support the vehicle, then remove the tire and wheel assembly.

Use heavy mechanic's wire or an equivalent to support the brake caliper whenever it is separated from its mount.

Fill the master cylinder reservoir to the proper level with clean brake fluid and burnish the brake pads and rotors as necessary.

Use heavy mechanic wire or an equivalent to prevent damage to the hydraulic flexible brake hose.

Raise and support the vehicle, then remove the tire and wheel assembly.

Inspect the caliper operation and use a C-clamp to slowly bottom the pistons of the caliper, repositioning the clamp as necessary.

Remove the tire and wheel assembly.

Take out the brake caliper bolts without depressing the brake pedal.

Attach the new anti-rattle clips to the brake caliper bracket, then install the brake pads, ensuring to install the inner pad-1 wear indicator and the outer pad-2 wear indicators.

Remove the tire and wheel assembly.

Install the brake pad retainers to the caliper bracket, ensuring the wear sensor is positioned at the leading edge of the inner pad during forward wheel rotation.

With the engine off, gradually apply the brake pedal to about 2/3 of its travel distance, slowly release it, and repeat until a firm pedal is achieved.

Attach the new anti-rattle clips to the brake caliper bracket, install the brake caliper, and place the new brake pads in the same orientation as noted during removal.

Use heavy mechanic's wire to prevent damage to the hydraulic flexible brake hose.

Inspect the caliper and mounting bracket.

New anti-rattle clips.

Lift it with a small flat-bladed tool to release any trapped air.

To avoid damage.

Install the new shims on the mounting bracket and the new brake pads, ensuring they are positioned as originally installed.

With the engine OFF, gradually apply the brake pedal to about 2/3 of its travel, then slowly release it, repeating this process until a firm pedal is achieved.