Question 1

How to properly disassemble and reassemble a rear Brake Calipers on Pontiac Fiero?

Accepted Answer

While taking apart the rear brake caliper it is recommended that only one caliper is on the stand for reference of position of components. The steps of the operation should start with the disconnection and then the detachment of the caliper from the automobile, then the pad assembly should be released. Fix it on the top of the suitable worktable with vise grip but make sure to have the cushion on the vise to avoid scratching the caliper. In case the parking brake lever components have not been pulled out earlier, pull them out now, and replace any of the damaged ones later. You can use a wrench to withdraw the actuator screw anticlockwise to push the piston out, and a C-clamp can help, although doing it with the caliper on the vehicle is not advised. It is necessary to ave philately the piston, balance spring, and Actuator screw and thereafter, there is a need to have the seal and thrust washer removed while observe their position to facilitate reinsertion. To remove the inboard pad retaining ring, unlock it, rotate it so the locking tangs are opposite the detents, and take it out. The piston dust boot, together with the seal, should be next to be removed, after which, the caliper mounting bolt dust boots and bushings are next to be removed. Check for any damage to the caliper bore and after this wipe the parts clean. When reassembling replace the bleeder valve and in the case of a new parking brake cable bracket if replaced. Coat the piston seal and the thrust washer appropriately making sure the thrust washer faces the appropriate direction. Screw in the actuator screw as well as the balance spring and by means of a hydraulic press; press in the piston on the inside of the bore. On completion of greasing of the lever anti-friction washer and the lever seal assemble them together with the lever by engaging the hexagonal nut firmly. Last, the piston dust boot should be placed back, any dampening springs if required and the brake pad should be placed before the caliper is bolted onto the vehicle.

Question 2

How to perform a Brake Calipers overhaul on Pontiac Firebird?

Accepted Answer

Before beginning this procedure, purchase a brake caliper overhaul kit specific to your vehicle. For 1988 and earlier models, start by removing the caliper and placing it on a workbench, then take out the brake pads. Remove the shoe dampening spring from the caliper piston and secure the caliper in a vise, cushioning the interior. Work the piston out by moving the parking brake lever back and forth; if it resists, use a wrench to rotate the actuator screw until the piston is free. Remove the balance spring, retaining nut, lever, lever seal, and anti-friction washer. Press the actuator screw out, pry out the dust boot, and use a tool to remove the piston seal. If necessary, take out the banjo housing retaining bolt and housing. Inspect the caliper bore for damage and clean all parts not included in the repair kit with appropriate solvents. Dry the parts with compressed air, install the bleeder valve, and if applicable, the parking brake lever mounting bracket. Assemble the banjo housing with new copper washers, lubricate and install the new piston seal, boot, thrust washer, and shaft seal. Lubricate the actuator screw and install it in the piston, followed by the balance spring. Lubricate the piston and caliper bore, then insert the piston assembly. Use a piston compressor to push the piston in, lubricate the anti-friction washer and lever seal, and install the lever, tightening the retaining nut. Seat the boot in the caliper recess and install the dampening spring. For 1989 and later models, clean the caliper exterior, unhook the collar return springs, and remove the actuating collar. Separate the clamp rod and bushing, discard the bushing, and remove the boot retainers and boots. Replace the piston seal, inspect the caliper bore, and wash all reusable parts. Lubricate the piston bore and install the piston, then lightly lubricate the actuating collar and assemble the pushrod, boots, and retainers. Attach the preload spring, lubricate the clamp rod, and insert it into the actuator collar. Push a new bushing onto the clamp rod, lubricate the inner boot, and guide the components into the caliper. Install the collar return springs, lubricate the caliper guide pins, and check the guide pin boots. Install the brake pads and the caliper, then bleed the brakes. Adjust the parking brake free travel to ensure no binding occurs, measuring the clearance between the lever and caliper housing, which should be between 0.024 and 0.028 inch. If adjustments are needed, clean the adjusting screw threads, apply thread locking compound, and turn the screw to achieve the desired clearance, then re-check after having an assistant pump the brake pedal.

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