Tools You'll Need:
* Jack and jack stands: Essential for safely lifting the car.
* Wheel chocks: To prevent the car from rolling.
* Lug wrench: To remove the wheel.
* Socket wrench set: Various sizes for bolts and nuts.
* C-clamp or rotor compression tool: To compress the caliper piston.
* Screwdriver (possibly Phillips and flathead): May be needed for caliper bracket bolts or retaining clips.
* Penetrating lubricant (like PB Blaster): Helps loosen rusty bolts.
* Wrench to match caliper bracket bolt size:
* Clean rags or shop towels: To keep things clean and avoid brake fluid contamination.
* Safety glasses and gloves: Protect yourself from injury.
Steps:
1. Safety First: Engage the parking brake firmly. Place wheel chocks behind the front wheels (opposite the wheel you're working on). Jack up the rear of the car and securely support it on jack stands. Never work under a car supported only by a jack.
2. Remove the Wheel: Loosen the lug nuts slightly before jacking the car. Remove the wheel and set it aside.
3. Compress the Caliper Piston: Using a C-clamp or a specialized caliper piston compression tool, carefully compress the caliper piston. This will create space to remove the rotor. Important: Brake fluid will likely be expelled. Protect surrounding areas from brake fluid spills, as it's corrosive and can damage paint. You may need to open the bleeder valve (small screw on the caliper) slightly to allow the fluid to escape more easily. Close it once finished.
4. Remove the Caliper: Depending on your Grand Prix's model, the caliper may be held on by bolts or a bracket. Loosen and remove these bolts. Carefully hang the caliper out of the way using a wire or bungee cord to avoid stressing the brake line. Do not let the caliper hang by the brake line.
5. Remove the Rotor: The rotor should now be free to slide off the hub. Sometimes, it might be stuck due to rust or corrosion. If so, gently tap it with a rubber mallet or hammer (protected with a block of wood to avoid damaging the rotor or hub).
6. Clean the Hub: Clean the wheel hub thoroughly to remove any rust, debris, or corrosion.
7. Install New Rotor (if replacing): Install the new rotor, ensuring it sits flush against the hub.
8. Reassemble: Reinstall the caliper, making sure the brake pads properly seat against the new rotor. Tighten all bolts to the manufacturer's specified torque.
9. Reinstall the Wheel: Tighten the lug nuts in a star pattern to ensure even pressure. Lower the car.
10. Bleed the Brakes (Important!): After reinstalling the caliper and bleeding off any air that may have entered the system from compressing the piston, you'll likely need to bleed your brakes to remove any air that has entered the system. This is crucial for proper braking performance. This usually involves using a bleeder wrench at the bleeder valve on the caliper, while someone else pumps the brake pedal. Consult your repair manual for specific bleeding instructions.
Important Considerations:
* Brake Fluid: Handle brake fluid with care. It is corrosive and can damage paint.
* Torque Specifications: Always use the correct torque specifications for all bolts and nuts. Incorrect torque can lead to loose parts and brake failure.
* Brake Pads: Inspect your brake pads. If they're worn, replace them at the same time as the rotors for optimal braking performance.
This is a general guide. Consult a repair manual specific to your 1993 Pontiac Grand Prix for detailed instructions and torque specifications. If you're unsure about any step, seek professional assistance from a qualified mechanic. Brake system failure can be extremely dangerous.
