Question In a newer vehicle, you apply the parking brake: Answers By using a diamond-shaped yellow knob. By using a round red knob. By using a square green knob. By using a black round knob. Explanation In a newer vehicle with air brakes, the parking brake is controlled by a diamond-shaped yellow knob. The knob is pulled out to apply the parking brakes and pushed in to release them. Take a FREE Practice Test Now This questions appears in the following tests: Texas Knowledge Test Class A , Mississippi Knowledge Test Class B , Illinois Air Brakes , New Jersey Air Brakes ,