how to resurface brake drums

How to Resurface Brake Drums

Brake drums are an essential component of a vehicle's braking system, particularly in drum brake setups. Over time, brake drums can wear out or become warped due to excessive heat and friction. When this happens, the surface of the drums can become uneven, leading to decreased braking performance, increased stopping distance, and potentially hazardous driving conditions. Resurfacing brake drums is a cost-effective way to restore their functionality and ensure your vehicle remains safe on the road. This article will guide you through the process of resurfacing brake drums effectively.

Understanding the Need for Resurfacing

Brake drums should be resurfaced if they exhibit signs of wear, such as scoring, grooves, or visible cracks. Additionally, if the brake pedal pulsates or the brakes feel grabby, it’s a sign that the drums may be worn unevenly. Resurfacing not only smooths out these imperfections but also extends the lifespan of your brake shoes.

Tools and Materials Required

Before you begin, gather the following tools and materials

- Brake drum resurfacing machine (can be rented from auto parts stores) - Basic hand tools (wrenches, sockets, screwdrivers) - Precision measuring tools (calipers, micrometers) - Brake cleaner - Safety glasses and gloves - Torque wrench - Replacement brake shoes (if necessary)

Step-by-Step Resurfacing Process

1. Preparation Safety First Before starting the resurfacing process, ensure you are wearing safety glasses and gloves to protect yourself from debris and contaminants. Make sure the vehicle is parked on a level surface and the ignition is off.

2. Remove the Wheel Loosen the lug nuts on the wheel with a wrench and raise the vehicle using a jack. Support it securely with jack stands. Remove the wheel completely to access the brake drum.

3. Remove the Brake Drum Depending on your vehicle, you may need to remove retaining screws or clips holding the brake drum in place. Once removed, gently pull the brake drum off the hub. Be cautious as there may be brake dust, which can be harmful if inhaled.

4. Inspect the Brake Drum Examine the surface of the brake drum for any visible defects. Use calipers to measure the diameter of the drum; it should not exceed the manufacturer's maximum diameter specifications. If it does, it may need replacement instead of resurfacing.

5. Set Up the Resurfacing Machine If you're using a brake drum resurfacing machine, follow the manufacturer's instructions to set it up. Ensure the machine is calibrated and adjusted according to the size of your drum.

6. Resurfacing the Drum Insert the drum into the resurfacing machine and turn it on. Allow the machine to grind the surface at a consistent speed. It’s essential to keep the machinery steady to achieve an even surface. Monitor the process, ensuring that you do not remove too much material; usually, removing about 0.020 inches is sufficient.

7. Cleaning the Drum Once resurfaced, remove the drum from the machine. Use brake cleaner to thoroughly clean the surface and remove any metal shavings or dust. This step is crucial as contaminants can affect the performance of your new brake shoes.

8. Re-assemble the Brakes Reinstall the brake drum by aligning it properly with the hub. Secure it with any screws or clips that were removed earlier. Replace the brake shoes if they are worn or contaminated, ensuring they are properly adjusted.

9. Reattach the Wheel Place the wheel back onto the hub, hand-tightening the lug nuts initially. Lower the vehicle from the jack stands and tighten the lug nuts with a torque wrench to the manufacturer's specifications.

10. Test Drive Once everything is reassembled, take the vehicle for a short test drive to ensure the brakes operate smoothly. Pay attention to any unusual sounds or vibrations that may indicate further issues.

Conclusion

Resurfacing brake drums is a valuable skill for any DIY mechanic and can save significant costs compared to a full brake replacement. However, if you encounter any complications during the process or if the brake system appears severely damaged, don't hesitate to seek professional help. Regular maintenance and periodic inspections of your vehicle's braking system are vital for safe driving. Always ensure your brakes are in top condition to enjoy a safe and smooth ride.