how to turn brake drums

How to Turn Brake Drums A Comprehensive Guide

Brake drums are vital components in the braking system of many vehicles, especially those equipped with drum brakes. Over time, these drums can wear down due to friction, heat, and environmental factors. To ensure optimal braking performance, it is essential to maintain and sometimes turn the brake drums to bring them back to their original specifications. This article will guide you through the process of turning brake drums, a task that can be performed by both DIY enthusiasts and professionals.

Understanding Brake Drum Turning

Turning a brake drum involves machining its surface to remove imperfections, ensuring a smooth and even surface for the brake shoes to make contact with. This process can help restore the drum's shape if it has become warped or has grooves from wear. Generally, it is recommended to turn brake drums rather than replace them when they can still be salvaged, as this can be a more cost-effective solution.

Tools and Equipment Needed

Before starting, gather the necessary tools and equipment. You will need

1. A brake drum turning machine or lathe This specialized machine is designed for shaping brake drums. 2. Basic hand tools Wrenches, screwdrivers, and pliers will help in removing the drum. 3. Calipers To measure the drum’s diameter and thickness accurately. 4. Safety equipment Goggles, gloves, and a dust mask are essential for protection against debris and dust.

Step-by-Step Process of Turning Brake Drums

1. Remove the Brake Drum Begin by safely lifting the vehicle using jack stands. Remove the wheel to access the brake components. Take off any retaining screws holding the drum in place and slide the drum off the wheel hub. If the drum is stuck, use a rubber hammer to gently tap it free.

2. Inspect the Drum Once removed, thoroughly inspect the drum for any cracks, deep grooves, or excessive wear. If the drum has any critical flaws, it may need to be replaced rather than turned.

3. Measure the Drum Use calipers to measure the diameter and wall thickness of the drum. Compare these measurements with the manufacturer’s specifications. If the drum is within acceptable limits for turning, proceed to the next step.

4. Setup the Turning Machine Mount the drum securely onto the brake drum turning machine. Ensure it is aligned correctly to avoid any imbalance during the turning process.

5. Turn the Drum Follow the settings on the machine to begin turning the drum. Slowly feed the tool into the drum's surface until a smooth finish is achieved. Check frequently to monitor the thickness and ensure you do not exceed the minimum thickness allowed by the manufacturer.

6. Finish and Clean After turning, inspect the surface for any remaining imperfections. Clean the drum thoroughly to remove any metal shavings or debris.

7. Reinstallation Once the drum is ready, reinstall it on the vehicle, ensuring that it fits snugly and is properly secured. Reassemble other components before lowering the vehicle and tightening the wheel lug nuts.

Final Thoughts

Turning brake drums is a practical maintenance task that can save money and enhance vehicle safety. However, it requires precision and care. If you're uncertain about any step of the process or if the drums show significant wear, it might be best to consult a professional. Regular inspections and proper maintenance will ensure that your vehicle’s braking system remains in excellent condition, providing safety for both the driver and other road users.