how to replace drum brake wheel cylinder

How to Replace Drum Brake Wheel Cylinder

Replacing a drum brake wheel cylinder is an essential maintenance task that can significantly improve your vehicle's braking performance. The wheel cylinder is a crucial component of the drum brake system, responsible for pushing the brake shoes against the drum to create the necessary friction for stopping. Over time, wheel cylinders can develop leaks or become less effective, necessitating a replacement. Here’s a step-by-step guide on how to replace a drum brake wheel cylinder.

Tools and Materials Needed - Socket set or wrench - Brake cleaner - New wheel cylinder - Brake fluid - Brake shoes (if necessary) - C-clamp - Rags - Safety goggles - Jack and jack stands

Step 1 Prepare the Vehicle First, ensure your vehicle is parked on a level surface and activate the parking brake. Using a jack, raise the rear of the vehicle and secure it with jack stands. Remove the wheel to access the drum brake assembly.

Step 2 Remove the Brake Drum Once the wheel is off, you may need to remove the brake drum. To do this, locate the adjusting mechanism on the brake backing plate and back it out to relieve tension on the shoes. Gently pull the drum off. If it's stuck, you may lightly tap it with a hammer to break it loose.

Step 3 Inspect the Brake Components Before replacing the wheel cylinder, inspect the brake shoes and other components for wear. If the shoes appear to be worn down or damaged, consider replacing them as well. This is a great time to upgrade your brakes and ensure optimal performance.

Step 4 Remove the Old Wheel Cylinder Locate the wheel cylinder, which is usually mounted on the brake backing plate. Disconnect the brake line from the wheel cylinder using a wrench. Make sure to have a rag handy to catch any spilling brake fluid. Next, remove the mounting bolts securing the wheel cylinder to the backing plate. Once the bolts are out, carefully pull the old cylinder out.

Step 5 Install the New Wheel Cylinder Position the new wheel cylinder in place, ensuring it aligns with the mounting holes. Secure it by tightening the bolts you removed earlier. Reconnect the brake line to the new cylinder, ensuring it’s tight to prevent leaks.

Step 6 Reassemble the Brake System If you had removed the brake shoes, replace them now. Use a C-clamp to compress the brake shoes, allowing for easier assembly. Once the shoes are in place, install the brake drum back on. Adjust the brake shoes using the adjusting mechanism until the drum spins freely without rubbing.

Step 7 Refill and Bleed the Brake System Since you've disconnected the brake line, it’s crucial to refill the brake fluid reservoir with fresh brake fluid. After refilling, you must bleed the brake system to ensure no air is trapped. This can be done by having someone pump the brake pedal while you release the bleeder valve located on the wheel cylinder.

Conclusion After replacing the drum brake wheel cylinder, reattach the wheel and lower the vehicle. Check the brake fluid level again and perform a few test stops to ensure everything functions properly. Routine checks and timely replacements of braking components are vital for vehicle safety. If you're unsure or uncomfortable performing this procedure, it's always wise to consult with or hire a professional mechanic. Armed with this guide, you should feel more confident tackling drum brake wheel cylinder replacements in the future.