how to replace drum brake wheel cylinder

How to Replace a Drum Brake Wheel Cylinder

Replacing a drum brake wheel cylinder is an essential maintenance task that ensures the braking system of your vehicle operates effectively. A faulty wheel cylinder can lead to brake fluid leaks and reduced braking performance, which can pose serious safety hazards. In this article, we will walk you through the step-by-step process of replacing a drum brake wheel cylinder.

Tools and Materials Needed

Before beginning the replacement process, gather the necessary tools and materials

- New wheel cylinder - Brake fluid - Brake cleaner - Wrenches and sockets - Screwdrivers (flat and Phillips) - Pliers - A jack and jack stands - A brake line wrench - Shop towels or rags

Step 1 Safety Precautions

Ensure that you are working safely throughout the process. Park your vehicle on a level surface, engage the parking brake, and wear safety goggles and gloves. Gather all your tools and materials to avoid interruptions.

Step 2 Remove the Wheel

Start by loosening the lug nuts of the wheel you will be working on. Use a jack to lift the vehicle and place it securely on jack stands. Once the car is stable, remove the lug nuts and take off the wheel to access the brake components.

Step 3 Access the Drum Brake Assembly

Remove the brake drum by pulling it straight off the wheel hub. If it's stuck, you may need to tap it gently with a rubber mallet or use a brake drum puller. Once the drum is removed, inspect the brake shoes and other components for wear or damage.

Step 4 Disconnect the Wheel Cylinder

Locate the old wheel cylinder mounted on the backing plate of the drum brake assembly. Disconnect the brake lines from the wheel cylinder using a brake line wrench. Be prepared for some brake fluid leakage, so have rags or shop towels on hand to clean up any spills.

Next, remove the retaining bolts that hold the wheel cylinder in place. Carefully slide it out from the backing plate. Make sure to take note of how the old cylinder is connected, as it will help you when installing the new one.

Step 5 Install the New Wheel Cylinder

Take the new wheel cylinder and compare it with the old one to ensure that they are the same part. Install the new wheel cylinder into the backing plate, aligning it with the mounting holes. Secure it in place with the retaining bolts, tightening them to the manufacturer's specifications.

Step 6 Reconnect the Brake Lines

Reconnect the brake lines to the new wheel cylinder, making sure they fit snugly. Take care not to over-tighten, as this could damage the fittings. Once the brake lines are connected, check for any kinks or leaks.

Step 7 Reassemble the Brakes

With the new wheel cylinder in place, reinstall the brake drum. Make sure the drum rotates freely and does not rub against the brake shoes. Reattach the wheel and hand-tighten the lug nuts before lowering the vehicle.

Step 8 Bleed the Brakes

Now that the new wheel cylinder is installed, it's essential to bleed the brakes to remove any air that might have entered the braking system. Start by having a friend press the brake pedal while you open the bleeder valve on the new cylinder. Close the valve before your friend releases the pedal. Repeat this process until you have a steady stream of brake fluid without air bubbles.

Step 9 Final Checks

Once you’re done bleeding the brakes, make sure everything is secure, and check the brake fluid level in the reservoir. Top it off if necessary. Finally, take the vehicle for a short test drive to ensure that the brakes are functioning properly and that there are no leaks.

Conclusion

Replacing a drum brake wheel cylinder can be a straightforward task if you have the right tools and follow the proper steps. Regular maintenance of your vehicle's braking system is crucial for safety and optimal performance. If you are uncomfortable performing this replacement yourself, consider seeking help from a professional mechanic.