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Replacing the rear brake caliper repair kit on your Mercedes W124 involves removing and rebuilding the brake calipers. The process can be quite complex and requires careful attention to detail. Here are the general steps to guide you through this process:
Tools and materials you may need:
- Rear brake caliper repair kit
- Brake fluid
- Brake cleaner
- Brake piston tool (for compressing pistons)
- Socket set
- wrench
- screwdriver
- Rubber mallets
- Brake bleed kit
- Safety equipment (gloves, safety glasses)
Procedure:
- Safety Precautions:
- Make sure the vehicle is on a flat, stable surface, the engine is turned off, and the handbrake is engaged.
- Wear safety gloves and glasses to protect your hands and eyes.
- Lifting the vehicle:
- Use a suitable jack to lift the rear of the vehicle and secure it with a jack bracket.
- Remove the wheels:
- Remove the rear wheel to access the brake caliper.
- Brake fluid reservoir:
- Inspect the brake fluid reservoir and, if necessary, suck up some brake fluid to prevent spillage when compressing the caliper piston.
- To remove the brake caliper:
- Carefully remove the brake caliper from the mounting bracket.
- Using the appropriate socket or wrench, disconnect the brake line from the caliper. Be prepared to collect any leaking brake fluid in a suitable container.
- Remove the caliper by removing the fixing bolts, pins, and any other hardware that holds it together.
- Remove the old seals and pistons:
- Carefully remove the old seals, o-rings, and pistons from the calipers.
- Inspect the caliper assembly for wear or damage.
- Cleaning the calipers:
- Clean the caliper thoroughly, including the caliper housing, piston holes, and all components. Use a brake cleaner to remove any old brake fluid, dirt, and debris.
- Replacing Seals and O-Rings:
- Install the new seals and o-rings from the repair kit into the calipers.
- Lubricate the new components with brake fluid before installation.
- Compression pistons:
- Use a brake piston tool or a suitable tool to compress the caliper piston back into its bore. Make sure it’s flush with the caliper housing.
- Reassembling the caliper:
- Reassemble the caliper according to the manufacturer’s instructions, including all pins, bolts, and brackets.
- Reconnect the brake line and make sure it is properly tightened.
- Deflating brakes:
- Deflating the braking system to remove any air. It is a common method to start with the wheel furthest from the master cylinder and work your way up to it. Use a brake bleed kit or have someone assist you.
- Fill the brake fluid:
- Top up the brake fluid reservoir with fresh brake fluid and replace the lid.
- Test the brake pedal:
- Press the brake pedal a few times to make sure the caliper piston is properly seated.
- Check for any brake fluid leaks around the calipers.
- Changing the wheels:
- Carefully reinstall the rear wheel and tighten the lug nuts.
- Lowering the vehicle:
- Carefully lower the vehicle to the ground.
- Test brakes:
- Test if the brakes are functioning properly by gently pressing and releasing the pedal. Make sure there is a firm brake pedal and that the vehicle stops correctly.
Rebuilding the rear brake caliper on a Mercedes W124 is a complex process that requires attention to detail and careful handling of brake components. If you have no experience with braking systems, it is highly recommended to consult a professional mechanic or technician for help to ensure that the job is done correctly and safely.
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