The most common type of foundation brake found on heavy vehicles is the:

Question

Accepted Answer

B: S-cam drum.. S-cam drums are the most common brake design used on foundation brakes for commercial vehicles. There will be one drum per wheel and operated by using an air-activated push rod to rotate an S-shaped cam to move the shoes into contact with the drums.

The most common type of foundation brake found on heavy vehicles is the:

Arizona CDL Air Brakes Test Info