What is an auto slack adjuster?

An auto slack adjuster, also known as an automatic brake adjuster or automatic adjuster, is a component used in the air brake system of commercial vehicles, such as trucks and buses. Its primary function is to automatically maintain proper tension and adjustment of the brake shoes in relation to the brake drums.
In traditional manual slack adjusters, the brake shoe clearance (the gap between the brake shoe and drum) needs to be manually adjusted periodically as the brake linings wear down. However, auto slack adjusters eliminate the need for manual adjustments by continuously monitoring and adjusting the brake shoe clearance.
Auto slack adjusters typically consist of a ratchet mechanism, an adjusting screw, and an actuator. The actuator senses the movement of the brake chamber diaphragm and applies the necessary force to rotate the ratchet mechanism and adjust the brake shoe clearance accordingly. This ensures that the brakes are always properly adjusted, maximizing their effectiveness and maintaining optimal braking performance.
By automating the adjustment process, auto slack adjusters help prevent excessive brake shoe clearance, which can lead to reduced braking efficiency, longer stopping distances, and increased wear on the brake components. Additionally, they help ensure consistent and balanced braking across all wheels, promoting safer operation and reducing the risk of brake-related accidents.
It's important to note that auto slack adjusters should be regularly inspected and maintained to ensure their proper functioning and adherence to safety regulations.
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