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. This questions appears in the following tests: Alabama Air Brakes Colorado Class B Knowledge Test Colorado Air Brakes Connecticut Air Brakes Florida Air Brakes Georgia Air Brakes Illinois Class A Knowledge Test Illinois Air Brakes Minnesota Air Brakes Montana Class B Knowledge Test New Hampshire Class A Knowledge Test New Hampshire Double New Jersey Class A Knowledge Test New Jersey Air Brakes New York Class A Knowledge Test North Carolina Air Brakes North Carolina Air Brakes North Dakota Air Brakes Pennsylvania Class A Knowledge Test South Carolina Double South Carolina Air Brakes South Carolina Air Brakes Texas Air Brakes Wisconsin Class A Knowledge Test