how to bleed trailer drum brakes

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

When it comes to trailer maintenance, ensuring your brakes are functioning properly is crucial for safe towing. One key aspect of brake maintenance is bleeding the brake system, which removes air bubbles that can develop in brake lines over time. Air in the lines can lead to diminished brake performance, making bleeding your trailer drum brakes essential. Here’s a complete guide on how to bleed trailer drum brakes safely and effectively.

What You Will Need

Before starting, gather the necessary tools and materials

- Jack and jack stands - Lug wrench - Brake bleeder wrench - Clear plastic tubing (to see the fluid and bubbles) - Brake fluid (compatible with your trailer) - A container to catch old brake fluid - Assistant (recommended for the bleeding process)

Step 1 Prepare the Trailer

1. Safety First Begin by parking the trailer on a flat, level surface. Ensure that you engage the trailer's parking brake and use wheel chocks to secure it against rolling.

2. Lift the Trailer Use the jack to lift the trailer at the designated lifting points. Once elevated, secure it with jack stands to ensure safety while you work on the brakes.

3. Remove the Wheels Loosen the lug nuts with the lug wrench and remove the wheels to access the drum brakes. Place the wheels in a safe location where they won’t roll away.

With the wheels off, you will now have access to the brake drum assemblies. Each drum typically has two brake cylinders that you will need to bleed.

1. Locate the Bleeder Valves Identify the bleeder valve on each brake cylinder. It is usually located at the top of the cylinder.

Step 3 Bleeding the Brakes

1. Prepare for Bleeding Attach a piece of clear plastic tubing to the bleeder valve, placing the other end into a container. This setup allows you to monitor the fluid and air as it leaves the system.

2. Add Brake Fluid Ensure your brake fluid reservoir is full. Check your trailer’s manual for the correct type of brake fluid to use, as using the wrong type can damage your brake system.

3. Start the Bleeding Process - With an assistant sitting in the towing vehicle (if applicable), instruct them to pump the brake pedal several times and hold it down. - While they hold the pedal down, open the bleeder valve with your brake bleeder wrench. You should see fluid and possibly air bubbles flowing through the tubing. - Once the flow of liquid (free of bubbles) begins, close the bleeder valve securely. - Instruct your assistant to release the brake pedal.

4. Repeat the Process Repeat the pumping and bleeding process until you see a steady stream of clear fluid with no air bubbles coming from the bleeder valve. It may take several cycles per brake cylinder.

5. Move to the Next Cylinder Once the first brake cylinder is bled, move to the second one and repeat the previous steps.

Step 4 Final Checks

1. Top Off the Brake Fluid After bleeding all cylinders, ensure that the brake fluid reservoir is once again filled to the proper level.

2. Replace Wheels Put the wheels back on the trailer and hand-tighten the lug nuts. Afterward, lower the trailer back to the ground and use the lug wrench to fully tighten the lug nuts in a star pattern to ensure even pressure.

3. Test the Brakes Before hitting the road, it’s vital to perform a brake test. Hitch your trailer to your tow vehicle and gently press the brake pedal to ensure the brakes respond well. Check for any unusual noises or behaviors.

Conclusion

Bleeding trailer drum brakes is a straightforward process that greatly enhances your safety while towing. By following these steps, not only do you maintain your trailer but also ensure optimal brake performance. Remember to regularly check your brakes and maintain your trailer for the best towing experience. If you feel unsure at any step, don’t hesitate to consult a professional mechanic. Safety should always come first on the road!