Step-by-step guide to changing brake cylinder on drum brake system

How to Replace the Brake Cylinder on Drum Brakes

Replacing the brake cylinder on drum brakes is an essential skill for any vehicle owner or mechanic. It can seem daunting at first, but with the right tools and some guidance, you can perform the replacement yourself and save on labor costs. This guide will walk you through each step of the process, ensuring that you execute it safely and correctly.

Tools and Materials Needed

Before you start, gather the necessary tools and materials

- Jack and jack stands - Lug wrench - Screwdriver set - Brake cleaner - New brake cylinder (specific to your vehicle model) - Brake fluid - Wrenches or pliers - Shop towel or rags

Safety First

Safety is paramount when working on brakes, as they are crucial for vehicle safety. Always work on a flat surface and use jack stands to secure the vehicle. Never rely solely on the jack.

Step-by-Step Guide to Replacing the Brake Cylinder

1. Prepare the Vehicle Park your vehicle on a flat surface, engage the parking brake, and turn off the ignition. If needed, loosen the lug nuts on the rear wheels before raising the vehicle with a jack.

2. Raise the Vehicle Once the lug nuts are loose, use a jack to lift the vehicle. After it's elevated, place jack stands under the vehicle for added security.

3. Remove the Wheel Finish removing the lug nuts and take off the rear wheel that corresponds to the brake cylinder you are replacing.

4. Access the Drum Brakes Depending on your vehicle, you may have to remove the drum itself. Find the retaining screws or clips that hold the drum in place and remove them. You might need to tap the drum gently with a hammer to loosen it if it’s seized due to rust.

5. Inspect the Brake Assembly Once you remove the drum, inspect the brake assembly. Take note of how the brake shoes and springs are arranged. It’s advisable to take a photo for reference when reassembling.

6. Locate the Brake Cylinder The brake cylinder is typically mounted on the backing plate behind the drum. There will be two brake lines connected to it.

7. Disconnect the Brake Lines Using a wrench or pliers, carefully loosen and remove the brake lines from the old brake cylinder. Be prepared for some brake fluid to leak out, which is why it's a good idea to have rags handy.

8. Unbolt the Old Cylinder Remove the bolts holding the brake cylinder to the backing plate. Once unbolted, carefully take out the old cylinder.

9. Install the New Brake Cylinder Position the new brake cylinder in place and secure it by tightening the bolts. Make sure that it is aligned properly.

10. Reconnect the Brake Lines Attach the brake lines to the new cylinder securely. Use a flare-nut wrench to avoid damaging the fittings, and ensure there are no leaks after everything is tightened.

11. Reassemble the Brake Components Reinstall the brake shoes, springs, and any other components you may have removed. Refer to your earlier photo for correct placement.

12. Reinstall the Drum and Wheel Place the brake drum back onto the assembly. Secure any retaining clips or screws, then put the wheel back on and hand-tighten the lug nuts.

13. Lower the Vehicle Remove the jack stands and lower the vehicle back to the ground. Once stable, use the lug wrench to tighten the lug nuts in a crisscross pattern.

14. Bleed the Brakes After replacing the brake cylinder, it's crucial to bleed the brake system to eliminate air bubbles. This step is essential for proper brake function.

15. Test Drive Before hitting the road, pump the brake pedal several times to establish pressure. Take your vehicle for a short test drive to ensure everything is functioning correctly.

Conclusion

Replacing the brake cylinder on drum brakes may seem intimidating, but by following these steps and practicing proper safety, you can successfully complete the task. Regular maintenance of your braking system is vital for driving safety, so don’t hesitate to perform this replacement when needed.