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 an essential maintenance task that ensures your vehicle stops safely and efficiently. The wheel cylinder is a critical component in the braking system; it converts hydraulic pressure from the brake master cylinder into mechanical force that pushes the brake shoes against the drum. Over time, wheel cylinders can develop leaks or become less effective, leading to reduced braking performance. This guide will walk you through the steps of replacing the wheel cylinder on drum brakes safely and effectively.

Tools and Materials Needed

Before you begin, gather the following tools and materials

- Jack and jack stands - Wheel chocks - Lug wrench - Brake cleaner - New wheel cylinder - Brake fluid - Bungee cord or rope - Wrenches (various sizes) - Screwdriver - Torque wrench - C-clamp or brake tool (optional)

Step 1 Prepare the Vehicle

1. Safety First Ensure your vehicle is on a level surface. Engage the parking brake and place wheel chocks behind the wheels that will remain on the ground. 2. Lift the Vehicle Using a jack, lift the vehicle from the appropriate jacking point and secure it with jack stands. Never work under a vehicle supported only by a jack.

3. Remove the Wheel Use a lug wrench to remove the lug nuts and take off the wheel. This will expose the brake assembly.

Step 2 Inspect the Brake Assembly

Before you replace the wheel cylinder, inspect the brake assembly for any other wear or damage. Pay attention to the brake shoes, springs, and the condition of the drum. If these components show significant wear, they may need replacement as well.

Step 3 Remove the Old Wheel Cylinder

1. Disconnect the Brake Line Locate the brake line connected to the wheel cylinder. Use the appropriate wrench to gently loosen and disconnect the brake line. Make sure to have a container ready to catch any brake fluid that may spill.

2. Remove Retaining Bolts The wheel cylinder is typically secured with two bolts. Use a wrench or socket to remove these retaining bolts.

3. Take Out the Wheel Cylinder Carefully pull the old wheel cylinder out of the brake assembly. Be mindful of any brake parts that may fall or get damaged during removal.

Step 4 Install the New Wheel Cylinder

1. Position the New Cylinder Take the new wheel cylinder and fit it into the same position as the old one. Ensure it aligns properly with the brake shoes.

2. Secure the Cylinder Reattach the retaining bolts and tighten them securely. Use a torque wrench to achieve the manufacturer's recommended torque specifications.

3. Reconnect the Brake Line Reattach the brake line to the cylinder. Ensure the connection is snug, but be careful not to overtighten, as this can damage the fittings.

Step 5 Reassemble and Test

1. Reassemble the Brake Components If you removed any other components to access the wheel cylinder, reassemble them accordingly. Ensure all spring clips and retaining clips are in place.

2. Bleed the Brakes Start bleeding the brake system to remove any air trapped in the lines. This can be done by having an assistant pump the brakes while you open and close the bleeder valve on the new cylinder.

3. Refill Brake Fluid Check the brake fluid reservoir and top it up with the appropriate fluid. Make sure to use the type specified in your vehicle’s manual.

4. Reattach the Wheel Place the wheel back onto the hub and hand-tighten the lug nuts. Lower the vehicle off the jack stands and then fully tighten the lug nuts in a crisscross pattern.

Final Steps

Once everything is reassembled and secure, take your vehicle for a short test drive. Pay attention to how the brakes feel; they should provide smooth and reliable stopping power. If you detect any issues, review your work to ensure everything was installed correctly.

By following these straightforward steps, you can replace the wheel cylinder on drum brakes and maintain the safety and efficiency of your vehicle's braking system. Remember, if you feel uncertain at any stage of this process, consulting with a professional mechanic is always a wise choice.