Steps to Replace a Wheel Cylinder on Drum Brake Systems

How to Change a Wheel Cylinder on Drum Brakes

Changing a wheel cylinder on a drum brake system is a crucial skill for car enthusiasts and those who want to maintain their vehicles. A faulty wheel cylinder can lead to decreased braking performance, brake fluid leaks, and even complete brake failure. Therefore, knowing how to replace it is vital for ensuring the safety and functionality of your vehicle. This guide will walk you through the steps necessary to change a wheel cylinder on drum brakes effectively.

Tools and Materials Needed

Before you begin, make sure you have the following tools and materials

1. Tools - Jack and jack stands - Lug wrench - Brake line wrench - Torque wrench - Socket set - Screwdrivers (flathead and Phillips) - Pliers - Brake cleaner - Line or flare wrench

2. Materials - New wheel cylinder - Brake fluid - New brake shoes (optional, but recommended) - Brake cleaner - Rags or paper towels

Step 1 Preparation

1. Safety First Park your vehicle on a flat surface, engage the parking brake, and remove the wheels. Loosen the lug nuts slightly before lifting the vehicle. 2. Lift the Vehicle Use a jack to raise the vehicle and securely place jack stands under the frame for safety. Remove the lug nuts completely and take off the drum.

Step 2 Inspect and Remove the Drum Brake Assembly

1. Inspect the Brake Assembly Check the brake shoes for wear and the drum for any visible damage. If the brake shoes are worn down, it's a good idea to replace them at the same time as the wheel cylinder.

2. Remove the Brake Shoes (if needed) If you're replacing the brake shoes, remove the retaining springs and clips, and take off the brake shoes carefully. This step may require some additional tools to release tension on the springs.

3. Remove the Wheel Cylinder Locate the wheel cylinder, typically found at the top of the brake assembly. Use a line wrench to disconnect the brake lines from the wheel cylinder to avoid stripping the fittings. After removing the lines, take out the bolts or clips securing the wheel cylinder to the backing plate.

Step 3 Install the New Wheel Cylinder

1. Clean the Area Before installing the new wheel cylinder, clean the area using brake cleaner to remove any dirt, dust, or brake fluid residues.

2. Install the New Wheel Cylinder Position the new wheel cylinder in place and secure it with the bolts or clips. Ensure it is tight and properly aligned.

3. Reconnect Brake Lines Carefully reconnect the brake lines, ensuring that they are properly sealed. Be cautious not to overtighten, as this can strip the fittings. Use a flare wrench for a secure fit.

Step 4 Reassemble Brake Components

1. Reinstall Brake Shoes If you’ve removed the brake shoes, reinstall them according to the manufacturer’s specifications. Ensure that all springs and clips are securely fastened.

2. Reinstall the Drum Once the brake assembly is complete, place the drum back over the brake shoes, making sure everything is aligned.

Step 5 Test and Refill Brake Fluid

1. Check Brake Fluid Level Before lowering the vehicle, open the hood and check the brake fluid reservoir. If necessary, fill it with the appropriate type of brake fluid, following the vehicle manufacturer’s recommendations.

2. Pump the Brakes After lowering the vehicle, pump the brake pedal several times to ensure the wheel cylinder expands and engages the brake shoes properly. Check for any leaks around the wheel cylinder.

3. Test Drive Once you feel confident everything is secure and functioning, take the car for a short test drive. Pay attention to how the brakes feel, making sure there’s no unusual noise or performance issues.

Conclusion

Changing a wheel cylinder on drum brakes may seem daunting, but with the right tools and careful attention to detail, it is a manageable task. Not only will it enhance your vehicle’s braking performance, but it also promotes safety on the road. Remember to follow each step closely, and don’t hesitate to consult your vehicle’s service manual for specific information. Always prioritize safety by wearing gloves and goggles, and if unsure, seek professional assistance. Happy wrenching!