To check the free play of manual slack adjusters of S-cam brakes, you should park on:

Question

Accepted Answer

C: Level ground, chock the wheels and release the parking brakes.. Prior to manually checking the slack adjusters of the service brakes, ensure the vehicle is parked on a flat surface, wheel chocks have been placed, and the parking brakes are released.

To check the free play of manual slack adjusters of S-cam brakes, you should park on:

Alaska CDL Air Brakes Test Info