rear drum brakes not working

Troubleshooting Rear Drum Brakes Not Working

Rear drum brakes are a crucial component of many vehicles, responsible for slowing down or stopping your car when you press the brake pedal. If you find that your rear drum brakes are not working effectively, it can pose a significant safety hazard. Understanding the common issues that can cause this problem and how to troubleshoot them is essential for maintaining your vehicle's braking system.

Understanding Drum Brakes

Drum brakes operate using a drum that rotates with the wheel and brake shoes that press against the drum's inner surface to create friction and stop the vehicle. Unlike disc brakes, which have a more straightforward design and often provide better performance, drum brakes can be more susceptible to specific issues, especially if not properly maintained.

Common Causes of Failure

1. Worn Brake Shoes Over time, the brake shoes inside the drum can wear down due to regular use. If they are worn too thin, they may not make adequate contact with the drum, leading to reduced braking effectiveness. Regular inspection of the brake shoes is crucial, typically every 20,000 to 30,000 miles.

2. Brake Fluid Leaks If there is a brake fluid leak, the pressure required to engage the brakes may be compromised. Check for any signs of leaking fluid around the brake lines, wheel cylinders, or master cylinder. If fluid is low, it may need to be topped up or replaced, and the source of the leak must be identified and repaired.

3. Frozen or Stuck Wheel Cylinders The wheel cylinders are responsible for pushing the brake shoes against the drum. If they become frozen or stuck due to rust or corrosion, they won’t function correctly, preventing the brake shoes from engaging the drum. Cleaning or replacing these components may be necessary.

4. Improper Brake Adjustment Drum brakes require proper adjustment to ensure that the brake shoes make contact with the drum effectively. If your brakes are improperly adjusted, it can lead to decreased braking power. Adjusting the brakes can improve performance, and it’s advisable to consult your vehicle's manual for the correct procedure.

5. Contaminated Brake Shoes or Drum Oil, grease, or brake fluid can get onto the brake shoes or inside the drum, significantly reducing friction. If contamination is suspected, the contaminated parts should be cleaned or replaced to restore effective braking performance.

Troubleshooting Steps

1. Visual Inspection Begin by visually inspecting the rear drum brakes for any obvious issues, such as leaks, worn shoes, or visible damage to the drum.

2. Check Brake Fluid Ensure that the brake fluid is at the correct level and check for any leaks in the braking system.

3. Test the Brakes When it is safe to do so, perform a test of the brakes in a controlled area to determine their response. Pay attention to any unusual sounds or sensations.

4. Adjust Brakes as Needed If your vehicle has adjustable drum brakes, take the time to adjust them according to your vehicle's specifications.

5. Consult a Professional If you are unable to identify or resolve the problem, or if the brake system requires repair beyond your skill set, seek assistance from a qualified mechanic. They have the tools and expertise to diagnose and fix complex issues.

Conclusion

Rear drum brakes are an essential part of your vehicle’s safety system. If you notice that they are not working properly, it is crucial to address the issue promptly to ensure safe driving conditions. Regular maintenance, inspections, and timely repairs will help keep your brake system functioning effectively, providing you with peace of mind every time you hit the road.