14 bolt drum brake rebuild

Rebuilding a 14% Bolt Drum Brake A Step-by-Step Guide

Drum brakes are a vital component of many vehicles, providing reliable stopping power when maintained properly. If you’re working with a 14% bolt drum brake, whether for a classic car, a truck, or another type of vehicle, understanding how to rebuild it can enhance your braking performance and improve safety. This article will guide you through the process of rebuilding a 14% bolt drum brake.

Understanding Drum Brakes

Before diving into the rebuild process, it’s important to understand the basic components of a drum brake. A drum brake consists of several key parts the brake drum, brake shoes, wheel cylinder, return springs, and the backing plate. When you press the brake pedal, hydraulic pressure forces the wheel cylinder to push the brake shoes against the inner surface of the drum, creating friction that slows down the vehicle.

Tools and Materials Needed

To carry out a successful rebuild, gather the following tools and materials

Step-by-Step Rebuild Process

1. Preparation Start by ensuring that you have a safe workspace and that the vehicle is securely elevated on jack stands. Remove the wheel to access the drum brake assembly.

2. Remove the Brake Drum Locate and remove the bolts securing the brake drum to the hub. Use the appropriate socket to loosen the 14% bolts. Once the bolts are removed, gently tap the drum with a rubber mallet if it is stuck in place.

3. Inspect Components After removing the drum, inspect the brake shoes, wheel cylinder, and springs for wear. Look for cracks, excessive wear, or leaking fluid from the wheel cylinder. It’s advisable to replace any worn components.

4. Remove Old Brake Shoes Carefully remove the old brake shoes. This usually involves disconnecting the return springs and sliding the shoes off the backing plate. Be cautious, as the springs can be under tension.

5. Install New Shoes Take the new brake shoes and apply a thin layer of brake grease to the contact points on the backing plate. Slide the new shoes into place and reconnect the return springs securely.

6. Replace the Wheel Cylinder If you found that the wheel cylinder was leaking, now is the time to replace it. Disconnect the brake lines carefully, and remove the old cylinder. Install the new cylinder and reconnect the brake lines, making sure there are no leaks.

7. Reassemble the Brake Drum Once everything is in place, carefully reattach the brake drum. Ensure that it spins freely without rubbing against the shoes. Secure it with the 14% bolts, tightening them to the manufacturer's specified torque setting using a torque wrench.

8. Final Checks Reinstall the wheel and lower the vehicle. Pump the brake pedal several times to ensure that the brake shoes seat properly against the drum. This step is crucial for effective braking performance.

9. Test Drive Finally, take the vehicle for a slow test drive to ensure the brakes function correctly. Listen for any unusual noises and check for proper stopping power.

Conclusion

Rebuilding a 14% bolt drum brake can seem daunting, but with the right tools and a methodical approach, it can be a rewarding task. A well-maintained brake system not only enhances your vehicle's performance but also ensures your safety on the road. If you’re uncertain at any step, don’t hesitate to consult a professional mechanic. Braking systems are critical to vehicle safety, and a little extra caution can go a long way. Happy rebuilding!