Steps to Replace a Wheel Cylinder on Drum Brake Systems

How to Change a Wheel Cylinder on Drum Brakes

Changing a wheel cylinder on drum brakes can seem daunting, especially if you're not an experienced mechanic. However, with the right tools and instructions, you can complete this task efficiently and safely. This guide aims to walk you through the steps involved in replacing a wheel cylinder on drum brakes, ensuring that you feel confident in tackling this repair.

Tools and Materials Needed

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

- Jack and jack stands - Lug wrench - Brake cleaner - Wrenches (specific sizes may vary based on your vehicle) - Pliers - New wheel cylinder - Brake fluid - Gloves and safety goggles - Torque wrench (optional)

Step 1 Safety First

Before starting any automotive repair, safety should be your top priority. Park your vehicle on a flat surface, engage the parking brake, and place wheel chocks behind the rear wheels if you're working on the front brakes. Always wear gloves and safety goggles to protect yourself from brake dust and fluid.

Step 2 Remove the Wheel

Using a lug wrench, loosen the lug nuts on the wheel where you will be replacing the wheel cylinder. Once you've broken the initial torque, lift the vehicle with a jack and secure it with jack stands. Finish removing the lug nuts and take off the wheel to expose the drum brake assembly.

Step 3 Inspect the Brake Drum

Before proceeding with the wheel cylinder replacement, inspect the brake drum for wear or damage. If the drum shows significant wear, it might be a good idea to replace it as well. Remove the brake drum by either pulling it off or using a suitable tool if it’s stuck.

To access the wheel cylinder, you'll need to remove the brake shoes. Start by taking note of how the shoes are positioned and possibly taking a picture for reference later. Use a wrench to disconnect the springs and any clips holding the shoes in place. Carefully take out the brake shoes and set them aside.

Step 5 Remove the Old Wheel Cylinder

The wheel cylinder will have two brake line connections. Use the appropriate wrench to disconnect these lines carefully. Be prepared for some brake fluid to leak out; using a catch pan can help minimize mess. Once the brake lines are disconnected, you’ll find bolts securing the wheel cylinder to the backing plate. Remove these bolts and gently pull the old cylinder out.

Step 6 Install the New Wheel Cylinder

Take your new wheel cylinder and install it in the same position as the old one. Secure it with the bolts you previously removed. Make sure it is in alignment with the brake shoes. Reconnect the brake lines to the new cylinder, ensuring they are tight to prevent leaks. Always check the manufacturer's specifications for torque settings if available.

Step 7 Reassemble the Brake Shoes

Reinstall the brake shoes into their original positions. Use the pictures you took as a reference to ensure everything is correctly aligned. Reattach all springs, clips, and any other components that hold the shoes in place.

Step 8 Reinstall the Brake Drum and Wheel

Once everything is back in place, carefully put the brake drum back on. Make sure it is seated properly. Then, place the wheel back on and hand-tighten the lug nuts. Lower the vehicle back to the ground and use the torque wrench to tighten the lug nuts to the manufacturer’s specifications.

Step 9 Bleed the Brake System

After you've installed the wheel cylinder, it’s crucial to bleed the brake system to remove any air that may have entered. Starting at the wheel farthest from the master cylinder, have a helper pump the brake pedal while you open the bleeder valve on the wheel cylinder. Close the valve before your helper releases the pedal. Repeat this process until no air bubbles are visible in the fluid.

Step 10 Test Drive

Once everything is reassembled, take a short test drive at low speeds to ensure that the brakes are functioning correctly. Pay attention to any unusual noises or pedal feel. If all seems well, you’ve successfully changed the wheel cylinder on your drum brakes!

In conclusion, while changing a wheel cylinder on drum brakes may require some mechanical knowledge and the right tools, it's a manageable task for an eager DIYer. Always remember to prioritize safety, and if you're ever in doubt, consult a professional. Happy fixing!