Adjusting Rear Brake Drums A Comprehensive Guide

Rear brake drums are a crucial component of many vehicles, particularly older models and certain types of trucks. Properly functioning brakes are vital for safety and performance, ensuring that your vehicle can stop effectively when needed. Over time, the brake shoes that press against the inside of the brake drum can wear, leading to decreased efficiency and the need for adjustments. In this article, we will explore the importance of adjusting rear brake drums, the process involved, and some tips to ensure optimal braking performance.

Understanding Rear Brake Drums

Brake drums operate using a simple yet effective mechanism. When you press the brake pedal, hydraulic pressure forces the brake shoes outward against the drum's inner surface, creating friction that slows down the vehicle. As mentioned, over time, the brake shoes can wear down, and the drum itself can become out of round or develop grooves, affecting braking efficiency. Additionally, the gap between the shoes and the drum can widen as the shoes wear, necessitating adjustments to restore optimal performance.

Importance of Adjusting Brake Drums

Adjusting your rear brake drums is essential for a number of reasons

1. Safety Properly adjusted brakes ensure that your vehicle stops effectively, reducing the risk of accidents caused by brake failure.

2. Performance Well-maintained brakes contribute to a smoother driving experience. Unchecked brake wear can result in poor stopping power, leading to longer stopping distances.

3. Increased Lifespan Regular adjustments can prolong the life of your brake components. By maintaining the correct distance between the shoes and the drum, you reduce the likelihood of premature wear.

4. Cost-effectiveness Failing to adjust brakes can lead to more significant issues, such as drum replacement or brake shoe wear, leading to expensive repairs. Regular maintenance can help you save money in the long run.

How to Adjust Rear Brake Drums

Adjusting rear brake drums may seem daunting, but with the right tools and a bit of patience, you can do it yourself. Here’s a step-by-step guide

Tools Needed

- Jack and jack stands - Lug wrench - Brake adjustment tool or flathead screwdriver - Safety glasses and gloves

Steps to Adjust

1. Safety First Park the vehicle on a flat surface and engage the parking brake. Put on safety glasses and gloves.

2. Lift the Vehicle Use the jack to lift the rear of the vehicle, then secure it with jack stands.

3. Remove the Wheel Using the lug wrench, remove the wheel to access the brake drum.

4. Inspect the Brake Components Before adjusting, visually inspect the brake components for wear or damage. Look for any cracks or contamination on the shoes and drum.

5. Find the Adjustment Access There is typically an access hole on the backing plate of the brake assembly. Use the brake adjustment tool or flathead screwdriver to locate the star wheel adjuster through this access.

6. Adjusting the Shoes Turn the star wheel (usually clockwise) to expand the brake shoes outward until they just start to make contact with the drum. You may hear a slight scraping noise. Then, back off the adjustment slightly to create a small gap (approximately 0.010 inches) between the shoes and the drum.

7. Repeat for the Other Side Adjust the other rear brake drum in the same manner.

8. Reassemble Reinstall the wheel and lower the vehicle. Tighten the lug nuts in a star pattern to ensure even pressure.

9. Test the Brakes Before driving, pump the brake pedal a few times to ensure the shoes are seated correctly. Take the vehicle for a short test drive to verify that the brakes are functioning properly.

Conclusion

Adjusting rear brake drums is a critical part of vehicle maintenance that every car owner should understand. Regular checks and adjustments not only enhance safety but also improve the overall performance of your vehicle. If you’re ever unsure about your ability to make these adjustments, don’t hesitate to seek professional assistance. Keeping your brakes in top shape will ensure a smoother, safer ride for years to come.