Preparation:
1. Park your vehicle on a level surface. Engage the parking brake and chock the wheels that won't be worked on.
2. Loosen the lug nuts on the wheel where the stuck caliper is located, but do not remove them entirely.
3. Use a hydraulic jack and jack stands to safely raise the vehicle until the wheel is off the ground.
Procedure:
1. Locate the Stuck Caliper:
- Identify the caliper that seems stuck. It might have uneven or excessive pad wear, or it might be seized and not responding to brake pressure.
2. Remove the Wheel:
- Once the vehicle is raised, remove the lug nuts and take off the wheel to access the caliper.
3. Inspect the Caliper:
- Examine the caliper and brake components for any visible signs of damage or corrosion that might be causing the sticking.
4. Release Brake Fluid Pressure:
- Locate the brake fluid bleeder screw on the caliper. If you see fresh brake fluid leaking from it during rotor and pad replacement, it indicates that the caliper is not releasing the pressure effectively.
5. Loosen the Bleeder Screw:
- Use a wrench to slightly loosen the bleeder screw to release some brake fluid. Catch the fluid in a suitable container.
- Tighten the bleeder screw once you see fresh brake fluid coming out.
6. Check Brake Lines for Clogs:
- Inspect the brake lines and hoses around the caliper for any clogs or kinks that might be impeding fluid flow.
7. Inspect Caliper Mounting Bolts:
- Ensure the caliper mounting bolts are not too tight, which can put undue pressure on the caliper.
8. Lubricate Components:
- Apply a high-temperature brake caliper grease to the moving parts of the caliper, such as the slide pins, piston, and the caliper bracket. This can reduce friction and help the caliper move freely.
9. Move the Piston Back:
- Use a C-clamp or a special caliper tool to gently push the caliper piston back into its bore.
10. Reassemble: Slide the caliper back into place over the rotor and secure it with the mounting bolts.
11. Bleed the Brake Lines:
- Follow the appropriate procedure to bleed the brake lines and remove any air that may have entered the system during this process.
12. Reattach the Wheel:
- Once the caliper is operating properly and there are no leaks, reinstall the wheel and secure the lug nuts.
Test the Brakes:
1. Lower the vehicle and remove the jack stands.
2. Test the brakes by gently applying pressure to the pedal. Ensure the brake pedal feels firm and responsive.
3. Take the vehicle for a test drive to see if the problem with the stuck caliper has been resolved.
If the caliper remains stuck or if you're unsure about any steps, it's best to seek the assistance of a qualified mechanic to ensure the safety and proper functioning of your vehicle's braking system.
