Causes and Solutions for Rear Drum Brakes Shaking in Vehicles

Understanding Rear Drum Brakes Shaking Causes and Solutions

Rear drum brakes are a common type of braking system found in many vehicles, particularly older models and some compact vehicles. While they are generally effective and reliable, drivers may occasionally experience issues such as shaking or vibrations during braking. This article will explore the potential causes of rear drum brake shaking, the symptoms to be aware of, and how to address the problem.

Causes of Shaking

1. Warped Brake Drums One of the primary causes of shaking in rear drum brakes is the warping of the brake drums. Over time and with frequent use, drums can become warped due to excessive heat generated during braking. This warping leads to uneven contact between the brake shoes and the drum, causing vibrations that can be felt through the brake pedal and the vehicle body.

2. Brake Shoe Misalignment Proper alignment of the brake shoes is essential for optimal braking performance. Misalignment can occur due to improper installation or wear and tear over time. When the brake shoes are misaligned, they may not contact the drum evenly, leading to shaking during braking.

3. Contaminated Brake Components The presence of oil, grease, or brake fluid on the brake shoes or drums can significantly impair braking performance. Contamination can create a slippery surface, which prevents the shoes from gripping the drum effectively. This lack of contact can result in vibrations and shaking.

4. Worn or Damaged Components Over time, the various components of a drum brake system can wear down. Worn brake shoes, damaged springs, or malfunctioning wheel cylinders can all contribute to uneven braking. If any part of the system is compromised, it can lead to vibration during braking.

5. Improperly Adjusted Brakes Drum brakes require periodic adjustment to ensure that the brake shoes make proper contact with the drum. If the brakes are not adjusted correctly, they may not engage fully, leading to uneven braking and shaking.

Symptoms to Watch For

Drivers should be attentive to several symptoms that may indicate problems with rear drum brakes

- Vibration The most obvious symptom is a noticeable vibration or shaking when applying the brakes. This can range from mild to severe and may increase with speed.

- Pulling to One Side If a vehicle pulls to one side while braking, it could indicate an issue with the rear drum brakes, possibly due to uneven wear or alignment problems.

- Noisy Braking Unusual sounds, such as grinding or squeaking, can signal problems within the brake system. These noises, especially if accompanied by shaking, warrant immediate attention.

- Increased Stopping Distance If braking feels less responsive or requires more force to slow down the vehicle, it could indicate that the rear drum brakes are not functioning properly.

Addressing shaking in rear drum brakes depends on identifying the underlying cause

1. Inspection A thorough inspection of the brake system is essential. Mechanics should check the condition of the brake drums, shoes, and all related components to identify any signs of wear or damage.

2. Resurfacing or Replacing Drums If the drums are warped, they may need to be resurfaced or replaced. Resurfacing can restore a smooth surface, while replacement may be necessary if the drums are significantly damaged.

3. Re-aligning and Adjusting Proper alignment and adjustment of the brake shoes is crucial. Mechanics should ensure that the shoes are correctly positioned and that the brake system is adjusted for optimal performance.

4. Replacing Contaminated Components If contamination is an issue, the affected brake components should be cleaned or replaced as necessary. Ensuring that all components are free of contaminants is vital for effective braking.

5. Routine Maintenance Regular maintenance of the brake system can prevent issues before they arise. This includes periodic inspections, adjustments, and timely replacements of worn parts.

Conclusion

Shaking in rear drum brakes is a symptom that should not be ignored. By understanding the potential causes and addressing them promptly, drivers can ensure their safety and maintain the reliability of their braking system. Regular inspections and maintenance will not only improve performance but also extend the life of the braking components. If you experience any symptoms of shaking or unusual behavior from your brakes, consulting a qualified mechanic is the best course of action.