How to Replace Wheel Cylinder on Drum Brakes - Step-by-Step Guide

Replacing the wheel cylinder on drum brakes is an essential maintenance task that can help ensure your vehicle’s braking system functions effectively. This procedure might seem daunting for the inexperienced, but with the right tools and guidance, you can complete the job safely and efficiently.

Tools and Materials Needed

Before beginning, gather the following tools and materials - New wheel cylinder - Brake fluid - Brake cleaner - Wrench set - Brake line wrench - Screwdriver - Pliers - Jack and jack stands - Safety goggles - Gloves

Preparation

1. Safety First Park your vehicle on a level surface and engage the parking brake. It’s crucial to wear safety goggles and gloves to protect yourself from brake dust and fluid.

2. Loosen the Wheel Lug Nuts Before lifting the vehicle, use a wrench to slightly loosen the lug nuts on the wheel where you will be working. Do not remove them completely just yet.

3. Lift the Vehicle Place a jack under the vehicle’s jacking point and lift it off the ground. Once elevated, secure it with jack stands to ensure stability. Now, remove the wheel by taking off the lug nuts completely.

Removing the Old Wheel Cylinder

1. Access the Brake Drum Most drum brakes require you to remove the brake drum. This might involve knocking it gently with a hammer if it is stuck due to rust or grime.

2. Inspect the Components Once the drum is off, take a moment to inspect all the brake components, such as shoes and springs, for wear. This is a good time to replace any that show signs of damage.

3. Locate the Wheel Cylinder The wheel cylinder is situated at the back of the brake shoes. Remove any retaining clips or bolts holding the cylinder in place.

4. Disconnect the Brake Lines Using a brake line wrench, carefully disconnect the brake lines from the wheel cylinder. Be prepared for some brake fluid to leak; have rags handy to mop it up immediately.

5. Remove the Old Wheel Cylinder After disconnecting the brake lines, pull the old wheel cylinder out from its mounting. Make sure to note how the cylinder is positioned for easier installation of the new one.

Installing the New Wheel Cylinder

1. Position the New Cylinder Install the new wheel cylinder in the same position as the old one. Secure it using the bolts or clips you removed earlier.

2. Reconnect the Brake Lines Once the new cylinder is in place, reconnect the brake lines securely, ensuring not to overtighten as this can cause damage.

3. Reassemble the Brake Components Replace the drum and ensure that everything is properly aligned. Reinstall the wheel and tighten the lug nuts by hand.

Final Steps

1. Lower the Vehicle Carefully remove the jack stands and lower the vehicle back to the ground.

2. Bleed the Brake System To eliminate any air in the brake lines, you will need to bleed the brake system. This is usually done by pumping the brake pedal and opening the bleed screw on the wheel cylinder to allow air and fluid to escape.

3. Test Drive Finally, take your vehicle for a test drive. Pay attention to how the brakes feel and listen for any unusual noises.

Replacing a wheel cylinder on drum brakes can save you money and improve your vehicle’s safety. Always consult your vehicle’s manual for specific instructions and torque specifications. If you're unsure about any step, don't hesitate to seek professional assistance.