Common Issues with Rear Drum Brakes and How to Fix Them

Understanding Rear Drum Brake Problems Common Issues and Solutions

Rear drum brakes are a vital component of many vehicles, especially older models and some newer ones. While they are effective at stopping a vehicle, they also present a unique set of problems that drivers should be aware of. Understanding these issues can help in effective maintenance and can potentially save time and money on repairs.

What Are Rear Drum Brakes?

Before delving into the problems associated with rear drum brakes, it’s essential to understand how they work. Drum brakes consist of a hollow drum that rotates with the wheel and brake shoes that press against the drum's inner surface to create friction and stop the vehicle. When the brake pedal is pressed, hydraulic pressure forces the brake shoes outward, making contact with the drum and slowing down the car.

Common Problems with Rear Drum Brakes

1. Worn Brake Shoes Over time, the friction material on the brake shoes wears down due to constant contact with the drum. If the shoes wear too thin, they may not provide sufficient braking force, leading to longer stopping distances, decreased effectiveness, and potentially dangerous situations. Regular inspections and timely replacements of brake shoes are crucial to maintain optimal performance.

2. Drum Warping Excessive heat generated from braking can cause the drum to warp. This distortion can lead to uneven brake shoe contact, resulting in a pulsating brake pedal or vibrations when braking. To remedy this issue, the drum may need to be machined or replaced, depending on the extent of the warping.

3. Brake Fluid Leaks The brake system is a closed hydraulic system, and any leaks can compromise braking efficiency. If fluid leaks from the wheel cylinder (which applies pressure to the brake shoes), it could lead to reduced braking power or complete brake failure. Regularly checking for leaks and ensuring the brake fluid is at the proper level is essential.

4. Rust and Corrosion Exposure to moisture can lead to rust on the drum and other components. This corrosion can create rough surfaces that impede the brake shoes' ability to create adequate friction. Applying anti-corrosive treatment and properly maintaining the brake system can help prevent this issue.

5. Sticky Brake Shoes Sometimes, the brake shoes can stick against the drum due to corrosion, dirt, or improper alignment. When this occurs, the vehicle may drag slightly when rolling, leading to increased wear on both the shoes and drum. Cleaning and lubricating the components can often resolve this problem.

6. Faulty Wheel Cylinders The wheel cylinders are responsible for pushing the brake shoes outward when the brakes are applied. If they fail or leak, the shoes won’t engage properly, resulting in reduced braking efficiency. Replacement of faulty wheel cylinders is necessary to restore proper function to the braking system.

Drivers should pay attention to signs that may indicate rear drum brake problems. A spongy or soft brake pedal, squeaking or grinding noises, and a pulling sensation to one side while braking can all signal issues. If any of these symptoms occur, it’s wise to have the brakes inspected by a professional.

Maintenance Tips

To extend the life of rear drum brakes and minimize problems, regular maintenance is key. Here are some tips

- Regular Inspections Have a mechanic inspect your drum brakes at least once a year or every 12,000 miles. This can help catch issues before they become serious problems. - Brake Fluid Maintenance Change your brake fluid according to the manufacturer’s recommendations, as contaminated fluid can lead to brake failure. - Driving Habits Practice smooth driving habits by avoiding sudden stops and heavy braking when possible, as this can reduce wear on the braking components.

Conclusion

Rear drum brakes are a reliable system for vehicle braking, but like any mechanical components, they can develop problems over time. Understanding common issues and proactively maintaining your brake system can ensure a safe driving experience. If problems occur, addressing them promptly with the help of a professional can prevent minor issues from escalating into serious safety concerns. Always remember that efficient brakes are crucial for your vehicle's safety and performance.