how to turn brake drums

How to Turn Brake Drums A Step-by-Step Guide

Brake drums play a vital role in the braking system of many vehicles, particularly older models and some light trucks. Over time and usage, brake drums can become worn out, resulting in decreased performance and potential safety hazards. Turning brake drums, also known as machining, is the process of resurfacing the internal and external surfaces to restore their functionality. This article offers a comprehensive guide on how to turn brake drums safely and effectively.

Understanding the Process

When you turn a brake drum, you are removing a thin layer of material from the surface to create a smoother finish. This can help restore the drum's roundness and reduce vibration when the brakes are applied. Typically, the surface is machined on a specialized lathe designed for this purpose.

Tools and Equipment Needed

1. Brake Drum Lathe This is specifically designed to machine brake drums. 2. Torque Wrench To ensure proper tightness when reassembling. 3. Measuring Tools Calipers and a micrometer for measuring drum diameter. 4. Safety Equipment Safety glasses and gloves to protect yourself during the process.

1. Preparation - Ensure you have a clean, organized workspace. Gather all the necessary tools and equipment. - Secure the vehicle on a level surface, and if possible, engage the parking brake.

2. Remove the Wheels - Use the lug wrench to loosen the lug nuts and remove the wheels. This will give you access to the brake drums.

3. Set Up the Brake Drum Lathe - Mount the brake drum onto the lathe’s spindles according to the manufacturer’s instructions. Ensure that it is securely fastened to avoid any vibration during the machining process.

4. Measure the Drum - Before machining, measure the drum's diameter using a caliper or micrometer. Note any wear or damage. Ensure the drum is still within the manufacturer’s specifications for turning.

5. Machining the Drum - Start the lathe and allow it to reach operational speed. Gradually feed the cutting tool towards the drum surface. - Check the machine settings and adjust them as necessary to achieve a consistent cutting depth. It is recommended to remove only a small amount of material at a time to prevent overheating and warping.

6. Check for Roundness - Periodically stop the lathe to measure the drum diameter at various points. This ensures that the drum remains perfectly round throughout the process.

7. Finish and Clean Up - Once the desired finish and dimensions are achieved, remove the drum from the lathe. Inspect the surface for any irregularities. - Clean the drum thoroughly to remove any debris or metal shavings.

8. Reassemble the Brake System - Reinstall the brake drum onto the wheel hub. Make sure to follow the torque specifications when tightening the lug nuts. - Reattach the wheels and lower the vehicle back onto the ground.

9. Testing - Before taking the vehicle back on the road, it’s crucial to test the brakes at low speeds in a safe area. Listen for any unusual sounds and ensure that the brakes perform effectively.

Conclusion

Turning brake drums can significantly extend their lifespan and enhance vehicle safety. While this process requires specific tools and knowledge, it can be performed by those with mechanical skills. If you're not comfortable with this task, it is advisable to consult a professional mechanic. Regular maintenance of your brake system, including periodic checks of the drum's condition, is essential for safe driving. Remember, proper braking can literally be a lifesaver on the road.