how do you bleed drum brakes

How Do You Bleed Drum Brakes? A Step-by-Step Guide

Proper vehicle maintenance is essential for safety and performance, especially when it comes to brake systems. Drum brakes, commonly found on the rear wheels of many vehicles, require occasional bleeding to ensure that they function correctly. Bleeding the brakes removes air from the brake lines, which can lead to improved braking performance and a firmer pedal feel. In this article, we will guide you through the process of bleeding drum brakes step-by-step.

Tools and Materials Needed

Before you begin, gather the necessary tools and materials

1. Brake Bleeder Tool or Hose You can purchase a brake bleeder kit or use a clear plastic hose attached to the bleeder valve to capture the fluid. 2. Brake Fluid Ensure you have the correct type of brake fluid as specified in your vehicle’s owner manual. 3. Wrench A wrench that fits the bleeder valve on the drum brake. 4. Clear Container A container to catch the old brake fluid. 5. Safety Glasses and Gloves Protect your eyes and skin from brake fluid, which can be corrosive.

1. Preparation - Park the vehicle on a level surface and set the parking brake. - Loosen the lug nuts on the rear wheels slightly but do not remove them yet. - If possible, lift the vehicle using a jack and secure it with jack stands to ensure safety while you work underneath the vehicle.

2. Remove the Wheel - Completely remove the lug nuts and take off the rear wheels. This gives you access to the drum brakes.

3. Locate the Bleeder Valve - Identify the bleeder valve on the drum brake assembly. It is usually located on the brake cylinder and can often be identified by its small size and hexagonal shape.

4. Add Brake Fluid - Before you start the bleeding process, check the brake fluid reservoir. Make sure it is filled to the proper level. Top it off with new brake fluid if necessary, as you will lose fluid during the bleeding process.

5. Bleeding the Brakes - Attach the brake bleeder tool or clear hose to the bleeder valve. Place the other end of the hose into the clear container to catch the fluid. - Have an assistant sit in the driver’s seat to pump the brake pedal. Instruct them to pump the pedal several times and then hold it down. - While the pedal is held, use your wrench to crack open the bleeder valve. This will let out air and old brake fluid. You should see fluid and possibly bubbles flow through the hose into the container. - Once fluid flow slows and returns to a steady stream, close the bleeder valve tightly while your assistant keeps the brake pedal depressed. - Instruct your assistant to release the pedal. Repeat this process several times until no more bubbles appear in the fluid stream. This indicates that all the air has been removed.

6. Check Fluid Levels - Throughout the process, periodically check the brake fluid reservoir level to ensure it does not run dry. If it does, air re-enters the system, requiring you to start the process again.

7. Finish Up - Once you have successfully bled the brakes on both sides (if applicable), reattach the wheels and securely tighten the lug nuts. - Lower the vehicle to the ground and again verify that the lug nuts are tight. - Test the brake pedal before driving to ensure that it feels firm and responsive.

Conclusion

Bleeding drum brakes can be a simple task that dramatically enhances your vehicle’s braking performance. By following the steps outlined above and taking your time, you can ensure your brake system is functioning optimally, providing you with a safer driving experience. If you encounter any issues during the process or feel unsure, it’s always best to consult with a professional mechanic. Remember, proper maintenance is key to vehicle safety!