how to replace drum brake wheel cylinder

How to Replace a Drum Brake Wheel Cylinder

Replacing a drum brake wheel cylinder may seem daunting, but with the right tools, patience, and careful attention to detail, you can accomplish this task on your own. The wheel cylinder is a crucial component of your drum brake system, converting hydraulic pressure from the brake lines into mechanical pressure to engage the brake shoes against the drum. When it fails, it can lead to poor braking performance or even brake failure. Here's a step-by-step guide on how to replace a drum brake wheel cylinder.

Tools and Materials Needed

Before starting, gather the following tools and materials

- New wheel cylinder - Brake fluid - Brake cleaner - Ratchet and socket set - Wrenches (adjustable or fixed) - Screwdriver (flathead and Phillips) - Pliers - Brake line wrench - Jack and jack stands - Tire iron - Safety glasses and gloves

Step-by-Step Instructions

1. Safety First

Before you begin, ensure you’re working in a well-ventilated area, preferably outside or in a garage with good airflow. Always wear safety glasses and gloves to protect yourself from brake dust and fluids.

2. Prepare Your Vehicle

1. Loosen the Lug Nuts Use the tire iron to slightly loosen the lug nuts on the wheel where the drum brakes are located. Do this while the vehicle is still on the ground. 2. Raise the Vehicle Use the jack to lift the vehicle and then place jack stands under it for stability. Ensure that the vehicle is secure before going underneath it.

3. Remove the Wheel Take off the loosened lug nuts and remove the wheel to expose the drum brake assembly.

3. Remove the Brake Drum

1. Inspect the Brake Drum If the drum is stuck, tap it lightly with a hammer to loosen it.

2. Take off the Brake Drum Once it’s free, slide it off the wheel studs to expose the brake shoes and wheel cylinder.

4. Disconnect the Wheel Cylinder

1. Locate the Wheel Cylinder The wheel cylinder is usually located at the top of the brake assembly, attached to the brake shoes.

2. Remove Brake Line Using a brake line wrench, carefully loosen and disconnect the brake line from the wheel cylinder. Be prepared for some brake fluid to leak out.

3. Unbolt the Wheel Cylinder Remove the bolts securing the wheel cylinder to the backing plate using a ratchet and socket. Keep in mind the cylinder may still be attached to the brake shoes via springs.

4. Remove the Wheel Cylinder Carefully pull the cylinder away from the brake assembly. You may need to gently manipulate the springs to fully disconnect it.

5. Install the New Wheel Cylinder

1. Position the New Cylinder Place the new wheel cylinder in the same position as the old one.

2. Bolt It Up Secure it in place with the bolts you removed earlier, ensuring it’s tightened to manufacturer specifications.

3. Reconnect the Brake Line Carefully reattach the brake line to the new wheel cylinder, tightening it securely but not overly tight to avoid damage.

6. Reassemble the Brake System

1. Replace the Brake Drum Reinstall the brake drum over the shoes and wheel cylinder.

2. Reattach the Wheel Place the wheel back on, tighten the lug nuts by hand first, then lower the vehicle back to the ground.

3. Secure the Lug Nuts Once on the ground, fully secure the lug nuts in a crisscross pattern to ensure even tightening.

7. Test the Brakes

1. Check Brake Fluid Ensure the brake fluid level is adequate and top off if necessary.

2. Pump the Brakes Before driving, pump the brake pedal a few times to ensure proper engagement of the new cylinder and shoes.

3. Test Drive Take your vehicle for a slow test drive, paying attention to how the brakes respond. Make sure there are no leaks and everything feels normal.

Conclusion

Replacing a drum brake wheel cylinder can save you time and money, allowing you to maintain your vehicle better. Always consult your vehicle’s repair manual for specific instructions related to your model, and consider seeking help from a professional if you encounter unexpected difficulties. With diligence and caution, you can ensure your brakes are functioning efficiently and safely.