Troubleshooting Issues with Rear Drum Brakes That Aren't Functioning Properly

Troubleshooting Rear Drum Brakes Not Working

Rear drum brakes are a critical component of a vehicle's braking system, and when they are not functioning properly, it can pose safety issues. If you find yourself facing problems with your rear drum brakes, it's essential to diagnose the issue quickly and address it. This article will guide you through some common causes and potential solutions for rear drum brakes that are not working.

Understanding Rear Drum Brakes

Rear drum brakes operate on a principle that differs from the more common disc brakes. In drum brakes, a cylindrical drum is attached to the wheel, and when you press the brake pedal, brake shoes expand and press against the inside of the drum to create friction and slow down the vehicle. While drum brakes are often more cost-effective and easier to maintain, they can be prone to several issues over time.

Common Problems

1. Worn Brake Shoes One of the most common reasons for rear drum brakes not working is worn-out brake shoes. Over time, the friction material on the shoes can degrade, reducing their effectiveness. Regular inspection can help identify wear before it leads to failure.

2. Leaking Brake Fluid Another possibility is a leak in the brake line, which can lead to a loss of hydraulic pressure. If the brake fluid level is low, it may indicate a leak that needs to be repaired.

3. Sticking Wheel Cylinders The wheel cylinder is responsible for pushing the brake shoes against the drum. If the cylinder becomes corroded or contaminated, it may stick and fail to apply sufficient pressure. In such cases, the wheel cylinder may need to be cleaned or replaced.

4. Drum Damage or Misalignment If the brake drum is warped or damaged, it can prevent proper engagement of the brake shoes. Ensuring that the drums are in good condition and appropriately aligned is key to the brakes functioning correctly.

5. Incorrect Adjustment Many rear drum brakes have an adjustment mechanism that allows the brake shoes to be positioned closer to the drum as they wear. If the adjustment is incorrect, the shoes may not make adequate contact with the drum, leading to reduced braking power.

6. Contamination Oil or grease on the brake shoes or drum can severely affect performance. This contamination may occur if there’s a leak in the axle seals. Cleaning or replacing affected parts will be necessary.

Diagnosing the Issue

If you suspect an issue with your rear drum brakes, it’s crucial to perform some diagnostics. Start by visually inspecting the brake components. Look for any signs of wear on the shoes, leaks around the wheel cylinders, and check the fluid level in the master cylinder. If you're comfortable doing so, take the drum off to inspect the shoes and drum surface directly.

Solutions

Once you’ve identified the cause of the problem, you can take appropriate action. If the brake shoes are worn, they should be replaced. In cases of leaking brake lines, you’ll need to replace or repair the affected section. Sticking wheel cylinders can often be cleaned, but if they are significantly rusted, a replacement may be necessary. Always ensure that drum brakes are adjusted properly and check for contamination before reassembling.

Conclusion

Rear drum brakes not working is a common issue that can arise from various factors. Regular maintenance, including inspections and timely repairs, can prevent many of these problems from occurring. If you are not comfortable working on your vehicle's braking system, it is advisable to seek the help of a professional mechanic to ensure your safety on the road. Remember, a reliable braking system is paramount for your vehicle's performance and your overall safety.