how to replace wheel cylinder on drum brakes

How to Replace the Wheel Cylinder on Drum Brakes

Replacing the wheel cylinder on drum brakes is a task that many vehicle owners can tackle with some basic tools and mechanical knowledge. A faulty wheel cylinder can lead to brake fluid leaks, reduced braking efficiency, or even brake failure. Therefore, it's essential to replace a malfunctioning wheel cylinder promptly. This article will guide you through the steps to successfully complete this task.

Tools and Materials Needed

Before starting, ensure you have the following tools and materials

- Jack and jack stands - Tire iron - Wrench set - Brake cleaner - Brake fluid - New wheel cylinder - Brake shoes (if necessary) - A catch pan for brake fluid - Safety goggles and gloves

Step 1 Prepare the Vehicle

1. Park Safely Ensure the vehicle is parked on a flat surface and turn off the ignition. Engage the parking brake. 2. Loosen the Lug Nuts Using a tire iron, slightly loosen the lug nuts on the rear tires, but do not remove them completely.

3. Raise the Vehicle Use the jack to lift the rear of the vehicle and secure it with jack stands for safety. Remove the lug nuts and take off the tire to access the brake assembly.

Step 2 Remove the Brake Drum

1. Inspect for Retaining Tools Some brake drums may have retaining screws or clips. If so, remove them with the appropriate tool.

2. Pull the Drum Off Gently pull the brake drum off. If it's stuck, lightly tap it with a hammer or use a drum puller. Be cautious not to damage any components.

Step 3 Remove the Old Wheel Cylinder

1. Access the Wheel Cylinder With the drum removed, locate the wheel cylinder. It is typically positioned on the back of the brake assembly.

2. Disconnect Brake Lines Use a wrench to unscrew the brake line from the wheel cylinder. Be prepared for brake fluid to leak. Use a catch pan to collect the fluid.

3. Remove the Mounting Bolts Unscrew the bolts securing the wheel cylinder to the backing plate. Once all fastening is removed, you can take out the old wheel cylinder.

1. Prepare the New Cylinder Before installation, it’s a good practice to apply a small amount of brake fluid to the rubber seals of the new wheel cylinder to ensure a better fit.

2. Mount the New Cylinder Position the new wheel cylinder into place and secure it with the mounting bolts. Ensure it is tightly fastened to prevent leaking.

3. Reconnect the Brake Line Screw the brake line back into the new wheel cylinder. Use a wrench to tighten, ensuring it is snug but not overly tight.

Step 5 Reassemble the Brake Components

1. Reinstall the Brake Drum Place the brake drum back over the brake shoes and wheel cylinder. Ensure everything aligns correctly.

2. Replace the Tire Put the tire back on the wheel hub, hand-tighten the lug nuts, and then lower the vehicle from the jack stands.

3. Tighten the Lug Nuts Once the vehicle is back on the ground, use the tire iron to tighten the lug nuts in a star pattern for even distribution.

Step 6 Bleed the Brakes

1. Bleed the Brakes Since you’ve opened the brake lines, it's essential to bleed the brakes to remove any air trapped in the system. This requires a second person to pump the brake pedal while you open and close the bleeder valve on the wheel cylinder until only brake fluid comes out without bubbles.

Step 7 Test Drive

Finally, once everything is back in place and the system is bled, take the vehicle for a test drive in a safe location. Test the brakes at low speeds to ensure everything is working correctly.

Conclusion

Replacing a wheel cylinder on drum brakes is a manageable task that can save you time and money if done correctly. Always prioritize safety by wearing protective gear and ensuring the vehicle is secured properly during the process. If you encounter any complications, don’t hesitate to consult a professional mechanic. Happy wrenching!