Rev Up for Success: Conquer the 2025 Commercial Driver's License (CDL) Exam!

To check the free play of manual slack adjusters on s-cam brakes, parking on level ground, chocking the wheels, and releasing the parking brakes is the appropriate procedure. This method ensures safety and accuracy during the inspection.

By parking on level ground, you prevent the vehicle from rolling, which might cause an accident or injury during the inspection. Chocking the wheels adds an additional layer of safety, stabilizing the vehicle and preventing any unintended movement. Releasing the parking brakes allows the slack adjusters to operate freely, providing a clear view of the free play to be monitored. This is crucial, as it allows for an accurate measurement of the slack adjuster’s adjustment, ensuring that they function correctly and maintain proper brake performance.

Other methods, such as parking on a slope or inspecting while the truck is moving, do not provide a safe environment to check the slack adjuster’s play properly. Driving backwards or having the truck in motion complicates the process and can lead to unsafe conditions, making it difficult to evaluate the slack adjusters accurately.