Question The most common type of foundation brake used is the: Answers S-cam drum brake. C-cam drum brake. G-cam disc brake. P-cam disc brake. Explanation The most common type of foundation brake is an s-cam drum brake. Take a FREE Practice Test Now This questions appears in the following tests: South Dakota Knowledge Test Class A , West Virginia Knowledge Test Class A , Georgia Knowledge Test Class B , Wisconsin Double , Connecticut Air Brakes , Maryland Air Brakes , Minnesota Air Brakes , Mississippi Air Brakes , North Carolina Air Brakes , South Carolina Air Brakes ,