Question Foundation brakes are used: Answers Only on the front wheels of a vehicle. Only on the rear wheels of a vehicle. On each wheel of a vehicle. Explanation Foundation brakes are used on each wheel of a CMV. The most common type of foundation brake is the s-cam drum brake. This questions appears in the following tests: Alaska Class A Knowledge Test Alaska Air Brakes Idaho Class B Knowledge Test Iowa Air Brakes Kentucky Class A Knowledge Test Louisiana Class A Knowledge Test Maryland Class A Knowledge Test Nebraska Air Brakes Oklahoma Class B Knowledge Test Oklahoma Air Brakes Oregon Air Brakes South Carolina Air Brakes South Dakota Air Brakes Vermont Air Brakes