new drum brakes dragging

Understanding New Drum Brakes Dragging Causes and Solutions

In the world of automotive maintenance, issues related to brakes are paramount to ensuring safety on the road. Among various braking systems, drum brakes are quite common in older vehicles and some modern cars, particularly in the rear wheel applications. However, with time and wear, these drum brakes can develop problems, one of the most frustrating being the phenomenon known as dragging. In this article, we will explore the causes of new drum brakes dragging and how to address this issue effectively.

What is Drum Brake Dragging?

Drum brake dragging occurs when the brake shoes do not fully retract after the brake pedal is released. This leads to the brake shoes partially remaining in contact with the brake drum, resulting in decreased performance, increased wear, and overheating. If left unchecked, dragging brakes can lead to significant safety hazards and further mechanical problems in the braking system.

1. Misalignment One of the most prevalent causes of dragging brakes is misalignment during the installation of new brake components. If the brake shoes are not aligned correctly with the drum, they may not retract fully, leading to constant contact with the drum surface.

2. Corrosion and Rust New drum brakes are often installed on vehicles that may have existing corrosion on the wheel cylinder surface or the brake drum itself. This buildup can impede the movement of the brake shoes, preventing them from retracting completely after braking.

3. Improper Adjustment Drum brakes require precise adjustment for optimal performance. If the adjusting mechanism of the brakes is improperly set, it may not allow for the necessary clearance between the brake shoes and the drum, resulting in dragging.

4. Faulty Wheel Cylinder The wheel cylinder is responsible for pushing the brake shoes outward against the drum. If the seals in the wheel cylinder are worn or damaged, it may not retract fully, causing the shoes to stay engaged with the drum.

5. Heat Expansion When brakes are used, they generate heat. In extreme cases, the heat can cause the brake components to expand and seize temporarily, leading to dragging. This is more common in newer installations where components may not yet have bedded properly.

6. Lack of Lubrication Components that should slide freely, such as the pivot points and adjusting mechanisms, require proper lubrication. If these parts become dry or dirty, they can bind, preventing the brake shoes from retracting.

Solutions to Brake Dragging

1. Inspection and Adjustment The first step in resolving dragging brakes is to perform a thorough inspection of the brake assembly. Look for any signs of misalignment or improper installation. Adjust the brake shoes according to the manufacturer’s specifications to ensure they are set at the right clearance.

2. Clean and De-grease Components If corrosion or rust is found, clean the affected surfaces with a suitable solvent and wire brush to remove any debris that could cause binding. Ensuring that the drums and shoes are clean will also improve performance.

3. Check and Replace Wheel Cylinder If there are signs of fluid leakage or damage to the wheel cylinder, it is critical to replace it. A properly functioning wheel cylinder ensures that the brake shoes retract fully.

4. Proper Lubrication Ensure that all pivot points and moving components are well-lubricated with high-quality brake lubricant. This will allow for smoother operation and reduce the chances of binding.

5. Heat Considerations If overheating is an issue, consider evaluating the weight of your vehicle and the type of driving conditions it commonly faces. Upgrading to high-performance brakes or using vented drums can help mitigate excessive heat buildup.

Conclusion

New drum brakes dragging can be a significant issue if not addressed promptly. Understanding the causes is the first step in ensuring proper function and safety. Regular maintenance and inspection can prevent dragging and prolong the life of your braking system. Always consult a professional mechanic if you encounter persistent problems, as they can provide the expertise needed to resolve these issues effectively. Safety on the road is paramount, and ensuring your brakes function correctly is an essential part of vehicle maintenance.