2026 Wisconsin Air Brakes CDL Practice Test 2

S-cam drum brakes have an S-cam in each brake chamber. Why is it called an "S-cam?"

It is shaped like the letter "S." It makes the brake shoes move in an S-shaped path. It is constantly spinning whenever the wheel is spinning.

It is shaped like the letter "S."

Access more questions from this quiz

Continue to 2026 Wisconsin Air Brakes CDL Practice Test 2 for more practice questions and the full quiz experience.