how to adjust self-adjusting drum brakes

How to Adjust Self-Adjusting Drum Brakes

Self-adjusting drum brakes are a critical component of a vehicle's braking system, ensuring optimal performance and safety. Proper adjustment is essential to achieving maximum effectiveness and longevity. Here’s a step-by-step guide on how to adjust these brakes.

Understanding Self-Adjusting Mechanism

Self-adjusting drum brakes utilize a mechanism that automatically adjusts the brake shoes as they wear down. This is typically accomplished through a ratcheting system that engages with the brake pedal’s movement. However, sediment and debris can hinder this process, leading to premature wear and decreased braking efficiency. Regular checks and adjustments are crucial.

Tools You'll Need

Before starting the adjustment process, gather the necessary tools - A jack and jack stands - A lug wrench - A brake adjusting spoon or flat-head screwdriver - A flashlight for better visibility - Brake cleaner (optional)

Step-by-Step Adjustment Process

1. Park and Prepare the Vehicle Ensure the vehicle is on a flat surface, and activate the parking brake. Loosen the lug nuts slightly but do not remove them yet.

2. Jack Up the Vehicle Use a jack to lift the car and secure it with jack stands. Remove the wheel to expose the drum brake assembly.

3. Inspect the Brake Shoes Examine the brake shoes for even wear. If they are excessively worn, replacement may be necessary.

4. Locate the Adjusting Mechanism Inside the drum, find the adjusting slot, usually located at the bottom. This is where the adjusting mechanism is accessed.

5. Adjust the Brakes Using the brake adjusting spoon, turn the adjuster. Turn it until the shoes come into light contact with the drum. You should feel slight resistance as you spin the drum.

6. Recheck the Adjustment Rotate the drum to ensure it spins freely without dragging. If it drags, further adjust until there is a slight gap between the shoes and the drum.

7. Reassemble the Wheel Once satisfied with the adjustment, put the wheel back on, hand-tighten the lug nuts, lower the vehicle, and then torque the lug nuts to the manufacturer’s specification.

8. Test Drive Finally, take the vehicle for a short test drive to ensure the brakes function correctly and the adjustment holds.

Conclusion

Adjusting self-adjusting drum brakes is a straightforward process that can enhance your vehicle’s safety and performance. Regular maintenance and adjustment ensure that your brakes operate optimally, giving you peace of mind on the road. If you're uncertain or uncomfortable with the process, consult a professional mechanic for assistance.