Replacing Rear Drum Brake Cylinders for Improved Vehicle Performance and Safety

Rear Drum Brake Cylinder Replacement A Step-by-Step Guide

When it comes to the braking system of your vehicle, the rear drum brake cylinder plays a critical role in ensuring safety and performance. Over time, the brake cylinder may wear out or become damaged, leading to potential brake failure. In such cases, it is essential to replace the rear drum brake cylinder promptly. This guide will provide you with comprehensive steps to carry out this task effectively.

Understanding the Brake Cylinder

The rear drum brake cylinder acts as a hydraulic actuator that pushes the brake shoes against the inside of the brake drum when you press the brake pedal. This friction slows down or stops the vehicle. Unfortunately, brake cylinders can develop leaks, leading to decreased braking efficiency or complete brake failure. Signs of a failing brake cylinder include a soft brake pedal, fluid leaks near the rear wheels, and a noticeable drop in braking performance.

Tools and Materials Needed

Before you begin the replacement process, gather the following tools and materials - Socket set and wrenches - Brake cylinder replacement kit - Brake cleaner - Brake fluid - Rags or paper towels - A jack and jack stands - A brake shoe hold-down tool (if necessary)

Step-by-Step Replacement Process

1. Safety First Begin by ensuring your vehicle is parked on a level surface. Engage the parking brake and wear safety goggles and gloves to protect yourself.

2. Remove the Wheel Use a lug wrench to loosen and remove the lug nuts of the rear wheel where you will be replacing the brake cylinder. Once the lug nuts are off, use a jack to lift the vehicle and securely place it on jack stands. Remove the wheel completely.

3. Access the Brake Assembly With the wheel removed, locate the drum brake assembly. Remove the drum by unscrewing any retaining screws and sliding it off the wheel hub. If the drum is stuck, gently tap it using a rubber mallet.

4. Inspect the Brake Components Before proceeding, inspect the brake shoes, springs, and other components for wear. If they are worn or damaged, consider replacing them at the same time.

5. Remove the Old Brake Cylinder Locate the brake cylinder, which is usually mounted on the rear of the backing plate. Disconnect the brake lines by loosening the fittings with a wrench. Be prepared for brake fluid to leak out, so have rags ready to catch the fluid. Remove the bolts securing the cylinder to the backing plate and take the old cylinder out.

6. Clean the Area Using brake cleaner, clean the area where the new brake cylinder will be installed. This step is crucial to prevent contamination and ensure a proper seal.

7. Install the New Brake Cylinder Take the new brake cylinder from the replacement kit and install it on the backing plate. Secure it with the bolts you removed earlier. Reattach the brake lines, making sure to tighten the fittings properly to prevent leaks.

8. Reassemble the Brake Assembly If you inspected or replaced any other components, reassemble the brake assembly in reverse order. Make sure all springs and clips are correctly positioned.

9. Reinstall the Brake Drum Slide the drum back onto the wheel hub and secure it in place. If there were retaining screws, reinstall them.

10. Put the Wheel Back On Reinstall the wheel and hand-tighten the lug nuts. Once the wheel is back in place, lower the vehicle back to the ground and use the lug wrench to fully tighten the lug nuts in a crisscross pattern.

11. Bleed the Brakes After replacing the brake cylinder, it's essential to bleed the brake lines to remove any air trapped inside. This can be done by having a helper pump the brake pedal while you open and close the bleeder valve on the brake cylinder. Repeat the process until there are no air bubbles in the fluid.

12. Test Drive Finally, before driving your vehicle on the road, press the brake pedal a few times to ensure it feels firm. Conduct a short test drive in a safe area to confirm that the brakes are working effectively.

Conclusion

Replacing the rear drum brake cylinder can seem daunting, but with the right tools and a methodical approach, it can be accomplished by most DIY enthusiasts. Regular maintenance and timely replacement of brake components are crucial for vehicle safety. If you encounter issues or feel unsure during the process, it's always wise to consult with a professional mechanic. Your safety and that of others on the road depend on it.