how to bleed rear drum brakes

How to Bleed Rear Drum Brakes A Step-by-Step Guide

Bleeding the rear drum brakes is a critical maintenance task that ensures your vehicle's braking system functions smoothly and effectively. When air enters the brake lines, it can lead to a spongy brake pedal and reduced stopping power, which can compromise your safety. Bleeding your rear drum brakes can be done at home with some basic tools and know-how. Here’s a comprehensive guide to help you through the process.

Tools and Materials Needed

Before starting, gather the following tools and materials

1. Brake Fluid Ensure you have the correct type of brake fluid for your vehicle (usually DOT 3 or DOT 4). 2. Wrench or Brake Bleeder Tool A wrench that fits the bleeder screw or a brake bleeder tool can make the job easier. 3. Clear Tubing To direct the fluid into a container. 4. Container To catch the brake fluid. 5. Jack Stands To safely elevate your vehicle. 6. Safety Goggles and Gloves To protect yourself from brake fluid, which can damage paint and irritate skin.

Safety First

Always prioritize safety when working on your vehicle. Ensure that the car is parked on a flat surface, engage the parking brake, and wear safety goggles and gloves. Use jack stands after lifting the vehicle with a jack to ensure it is stable.

Step-by-Step Process

1. Locate the Bleeder Valve

The first step is to locate the bleeder valve on the rear drum brake assembly. Typically, it is found on the brake cylinder, which is mounted on the back of the drum. Refer to your vehicle’s manual for the exact location if you have trouble finding it.

2. Prepare the Brake System

Before bleeding the brakes, it's vital to check the brake fluid level in the master cylinder. Open the hood and locate the master cylinder reservoir. If the fluid is low, add the appropriate type of brake fluid. This helps prevent air from re-entering the system during the bleeding process.

3. Secure the Tubing and Container

Attach the clear tubing to the bleeder screw on the rear drum brake. Place the other end of the tubing into your container to catch any expelled brake fluid. This not only keeps the work area clean but also allows you to see when the air bubbles are gone.

4. Start Bleeding

Now it’s time to bleed the brakes

1. Have Someone Help You It’s easiest to have a friend assist you in this process. One person will be inside the vehicle to press the brake pedal while the other operates the bleeder valve. 2. Press the Brake Pedal Instruct your helper to pump the brake pedal a few times and hold it down.

3. Open the Bleeder Valve While your helper holds the brake pedal down, use the wrench to crack open the bleeder valve slightly. Watch for brake fluid and air bubbles to escape through the tubing.

4. Close the Bleeder As fluid begins to flow, close the bleeder valve before your helper releases the brake pedal. This prevents air from re-entering the system.

5. Repeat Have your helper release the brake pedal. Then, repeat this process until you see a steady stream of clear brake fluid without air bubbles. This may take several iterations.

5. Check the Brake Fluid Level

After bleeding, check the master cylinder reservoir again to ensure the fluid level is adequate. Top it off if necessary.

6. Test the Brakes

Once you have bled both rear drum brakes, lower the vehicle from the jack stands. Pump the brake pedal a few times before taking a test drive to ensure the brakes feel firm and responsive.

Conclusion

Bleeding the rear drum brakes is an essential part of brake maintenance that can significantly improve your vehicle's safety. By following these steps, you can ensure that your braking system functions effectively. Remember always to dispose of used brake fluid responsibly and check your vehicle's manual for any specific recommendations related to your braking system. Safe driving!