CDL Class B Pre Trip Inspection Practice Exam

The slack adjuster is a crucial component in the braking system, especially for vehicles equipped with air brakes. Its primary function is to ensure proper adjustment of the brake shoes relative to the brake drum. This adjustment is vital because it directly affects the effectiveness of the brake system. When the brake is applied, the slack adjuster translates the movement of the brake chamber into a corresponding movement of the brake shoes, ensuring they make sufficient contact with the drum to generate effective stopping power.

An improperly adjusted slack adjuster can lead to increased stopping distances or uneven brake wear, which can compromise vehicle safety. By maintaining the correct distance between the brake shoes and drum, the slack adjuster plays a vital role in the safe operation of the vehicle. Therefore, its function is integral rather than auxiliary, as it has a direct impact on the control and efficiency of the braking system.