Tools You'll Need:
* C-clamp or brake caliper piston compressor: A specialized tool is best; a C-clamp can work but requires care to avoid damaging the piston.
* Sockets and wrenches: To remove the caliper and potentially the brake pads.
* Penetrating oil (like PB Blaster): To help loosen any rusted or seized components.
* Clean rags or shop towels: To keep things clean and avoid contamination.
* Gloves: To protect your hands.
Procedure:
1. Safety First: Engage the parking brake firmly. Chock the front wheels. Jack up the rear of the car securely and support it with jack stands. Never work under a car supported only by a jack.
2. Remove the Wheel: Remove the wheel using the appropriate lug wrench.
3. Remove the Caliper: Locate the caliper bolts holding the caliper to the brake bracket. Spray penetrating oil on the bolts if they're difficult to remove. Carefully loosen and remove the bolts. Support the caliper with a bungee cord or wire to keep it hanging; don't let it dangle by the brake line.
4. Remove the Brake Pads: Remove the brake pads from the caliper.
5. Inspect for Damage: Inspect the piston, caliper, and brake pads for any signs of wear, damage, or corrosion. Replace worn or damaged components as necessary.
6. Push in the Piston: This is the crucial step. The rear pistons on a VW Jetta often *wind in* rather than simply pushing straight back. This is because they're self-adjusting.
* Using a specialized brake caliper piston compressor: This is the safest and easiest method. These tools properly compress the piston while rotating it as needed. Follow the manufacturer's instructions for your specific tool.
* Using a C-clamp (less recommended): If you absolutely must use a C-clamp, place a block of wood between the C-clamp jaws and the piston to distribute pressure evenly. Slowly and gently compress the piston, turning it as you push. Resist the urge to force it; if it's stuck, try some penetrating oil and carefully work it back and forth. You'll likely feel resistance and it will turn as you push.
7. Install New Pads: Install the new brake pads.
8. Install the Caliper: Install the caliper back onto the bracket.
9. Reinstall the Wheel: Carefully reinstall the wheel and tighten the lug nuts.
10. Lower the Vehicle: Lower the vehicle to the ground.
11. Pump the Brakes: Before driving, pump the brake pedal several times to ensure that the brakes are functioning properly.
Important Considerations:
* Brake Fluid: When compressing the piston, the brake fluid is pushed back into the master cylinder. Make sure the master cylinder reservoir doesn't overflow. If necessary, carefully siphon some fluid out of the reservoir before beginning.
* Parking Brake: The parking brake mechanism may be integrated into the rear caliper. Be aware of this and take care not to damage it.
* Professional Help: If you're uncomfortable performing this repair, take your vehicle to a qualified mechanic. Brake systems are critical for safety, and improper repair can lead to dangerous situations.
Remember to consult your Volkswagen Jetta's repair manual for specific instructions and torque specifications. Safety should always be your top priority when working on your brakes.
