drum brake won't go back on

Understanding Drum Brake Issues Why They Won't Go Back On

Drum brakes are a crucial component of many vehicles, providing reliable stopping power. However, car owners may sometimes face the frustrating issue of the drum brake not going back on after removal. This problem can stem from various factors, and understanding these can help in troubleshooting and ensuring the brakes function properly.

1. Understanding Drum Brake Mechanics

To grasp why a drum brake won't go back on, it's essential first to understand how they work. Drum brakes consist of several components, including the brake drum, shoes, springs, and a wheel cylinder. When the brake is applied, hydraulic pressure forces the wheel cylinder to push the brake shoes outward against the inner surface of the drum, creating friction that slows the car.

2. Common Reasons for Difficulties in Reinstallation

A few common reasons why drum brakes won't go back on include

- Misalignment of Brake Shoes One of the most common reasons is that the brake shoes may not be properly aligned. If the shoes are not positioned correctly after they have been removed, they can prevent the drum from sliding back into place. This can happen if they are pushed too far out or if they are not resting properly within the drum.

- Expanded Shoes Over time, brake shoes can wear and expand, especially if the drums are not regularly serviced. If new shoes were installed, and the drum was removed without adjusting the shoes, they may be too wide to fit back into the drum. This situation often requires adjusting the shoe spring mechanisms or even replacing the shoes if they are too worn.

- Dirty or Corroded Surfaces Dirt, grease, or corrosion on either the drum or the shoes can also impede the fitting process. Brake dust and debris can accumulate, causing an uneven surface that prevents the drum from sealing correctly. Cleaning the surfaces thoroughly can resolve this issue.

- Faulty or Broken Springs The springs in the brake assembly play a vital role in maintaining the position of the shoes. If any of these springs are broken or not functioning correctly, they might not pull the shoes back sufficiently, causing difficulty in reinstallation.

3. Troubleshooting Steps

To troubleshoot this issue, one should follow several steps

- Inspect the Brake Components Check the brake shoes, springs, and the brake drum for any signs of wear, damage, or dirt. Cleaning all surfaces and removing debris can often help.

- Adjust the Brake Shoes If the shoes are too tight, use the adjusting mechanism to push them back. Many drum brakes come with a self-adjusting feature, but it may require manual adjustment, especially after replacement.

- Check the Springs Examine all springs for any signs of wear or breakage. Replacing damaged springs can significantly improve the assembly's functionality.

- Consult a Professional If the above steps do not resolve the issue, it may be best to consult a professional mechanic. They can provide deeper insights and repairs that may be needed beyond the typical DIY approaches.

4. Conclusion

In conclusion, if you find yourself faced with the issue of a drum brake that won't go back on, don't panic. Understanding the reasons behind this problem can help you address it effectively, ensuring your vehicle's braking system works optimally. Regular maintenance, inspections, and cleanings can also prevent such issues, fostering a safer driving experience. Whether you choose to troubleshoot it yourself or consult with a professional, addressing drum brake issues promptly is essential for your safety on the road.