This is a general overview and specific steps might vary slightly depending on your exact model and whether you have drum or disc brakes in the rear. Most '86 Trans Ams had disc brakes in the rear, but it's crucial to verify this before starting.
Tools You'll Need (for rear disc brakes):
* Jack and jack stands (crucial for safety)
* Wheel chocks
* Lug wrench
* Socket wrench set (metric)
* Torque wrench
* C-clamp or brake caliper compression tool
* Wire brush or brake cleaner
* New rear brake pads
* Penetrating lubricant (like PB Blaster)
* Gloves
* Safety glasses
Steps (for rear disc brakes):
1. Safety First: Park on a level surface, engage the parking brake, and chock the front wheels. 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: Remove the lug nuts and take off the wheel.
3. Expose the Caliper: You should now see the brake caliper, which is clamped around the rotor.
4. Compress the Caliper Piston: This is often the trickiest part. You'll need to compress the caliper piston to create enough space for the new, thicker brake pads. Use a C-clamp or a specialized brake caliper compression tool. Be careful not to damage the piston or boot. You may need to turn the piston slowly as you compress it to avoid binding. Some pistons also rotate as you push them back in, so you might need to carefully rotate the piston as you're compressing it.
5. Remove the Brake Pads: There are usually retaining pins or clips holding the pads in place. These may require a small punch or pliers to remove. Once removed, carefully take out the old brake pads. Note the orientation of the pads – they usually have a wear indicator on them.
6. Clean the Caliper and Slides: Use a wire brush and brake cleaner to clean any dirt, rust, or debris from the caliper, caliper slides, and the caliper mounting bracket. This ensures smooth caliper movement. Apply lubricant to the caliper pins or slides as recommended by your repair manual.
7. Install New Brake Pads: Install the new brake pads, ensuring they are oriented correctly. Replace any retaining pins or clips.
8. Reinstall the Wheel: Carefully reinstall the wheel and tighten the lug nuts to the manufacturer's specified torque (check your owner's manual).
9. Lower the Vehicle: Slowly lower the vehicle from the jack stands.
10. Pump the Brakes: Get back in the car and firmly pump the brake pedal several times to ensure the pads are properly seated against the rotor.
11. Test Drive: Carefully test drive the vehicle to check for proper braking performance. If you notice anything unusual, consult a mechanic immediately.
Important Considerations:
* Brake Fluid: You might need to bleed the brakes if you completely removed the brake caliper from the mounting bracket or if the brake fluid level drops significantly. Bleeding the brakes is a separate process and should be done correctly to avoid air getting into the brake lines.
* Rotor Condition: Inspect the brake rotors for wear and scoring. They might need resurfacing or replacement if they're badly damaged.
* Repair Manual: A repair manual specific to your '86 Pontiac Trans Am is highly recommended. It will provide detailed instructions, torque specifications, and diagrams.
Again, if you are not comfortable performing this repair, please take your vehicle to a qualified mechanic. Brake system failure can be extremely dangerous.
