rear drum brakes not working

Understanding Rear Drum Brakes Not Working Causes and Solutions

Rear drum brakes are a vital component of a vehicle’s braking system, providing essential stopping power and safety. However, like any mechanical system, they can experience issues over time. When rear drum brakes are not functioning correctly, it can lead to decreased performance and compromising safety. In this article, we will explore the common causes of rear drum brakes failing and discuss possible solutions.

Common Causes of Failure

1. Worn Brake Shoes One of the primary reasons for rear drum brake failure is worn-out brake shoes. The brake shoes are the components that press against the brake drum to create the friction needed to stop the vehicle. Over time, the friction material can wear down, leading to less effective braking and eventual failure.

2. Corrosion and Rust Drum brakes are susceptible to corrosion, especially if the vehicle is frequently exposed to moisture, road salt, or harsh weather conditions. Rust can accumulate on the drum and the brake shoes, preventing them from making proper contact and reducing braking efficiency.

3. Improper Adjustment Drum brakes require a specific adjustment to function correctly. If they are not adjusted properly, the brake shoes may not make the necessary contact with the drum. This can lead to uneven wear or complete brake failure.

4. Brake Fluid Leaks Although drum brakes primarily function via mechanical means, some systems may use brake fluid to assist in operation. A leak in the brake lines or master cylinder can lead to a loss of hydraulic pressure, causing the brakes to fail.

5. Broken or Weak Springs Drum brakes rely on a series of springs to return the brake shoes to their original position after the brake pedal is released. If these springs are broken or weak, the shoes may not retract correctly, leading to dragging brakes and overheating.

6. Overheating Continuous use of brakes, especially during heavy driving or towing, can lead to overheating. When drums overheat, they may expand, causing the shoes to become misaligned. Additionally, excess heat can lead to brake fade, further diminishing braking power.

Diagnosing the Problem

If you notice that your rear drum brakes are not functioning appropriately, it's crucial to diagnose the issue early. Signs of malfunction may include a decrease in stopping power, unusual noises when braking (such as grinding or squeaking), or the brake pedal feeling spongy or unresponsive. Regular inspections can help identify issues before they become serious.

1. Visual Inspection Begin with a visual inspection of the brake components. Look for signs of wear, corrosion, or fluid leaks. Ensure that the brake shoes have enough friction material left and that the drum surface is in good condition.

2. Check Adjustments Verify that the brake shoes are correctly adjusted. Most vehicles have an automatic adjustment mechanism, but it may require manual intervention in some cases.

3. Test Brake Performance Conduct a simple brake test during a safe driving condition. Listen for unusual noises and feel whether the brakes engage smoothly and effectively.

Solutions and Repairs

Once the issue with the rear drum brakes has been identified, it's important to address it promptly to ensure vehicle safety.

1. Replace Worn Components If the brake shoes are worn or the drum is damaged, replacing these components is essential. High-quality brake parts should be used to ensure reliable performance.

2. Clean and Maintain If corrosion is present, clean the affected parts thoroughly. Regular maintenance can prevent rust from building up in the future.

3. Hydraulic Repairs If there are leaks in the brake lines or master cylinder, these should be fixed immediately to restore proper hydraulic function.

4. Professional Help If you're unsure about diagnosing or repairing your rear drum brakes, it’s always best to consult a professional mechanic. They have the expertise and tools necessary to handle brake issues safely and effectively.

Conclusion

Rear drum brakes not working can pose significant dangers while driving. By understanding the common causes of failure and implementing a regular maintenance routine, you can ensure that your drum brakes function correctly, enhancing your vehicle's safety on the road. Regular inspections and timely repairs not only improve performance but also prolong the life of your braking system.