Cdl Air Brakes Test Questions & Accurate Answers

What can legally hold a parking or emergency brake in position for a truck, truck tractor, or bus? {Ans: Spring pressure}A straight truck or bus air brake system should not leak at the rate of more than ____ psi per minute with the engine off and the brakes released. {Ans: 2}If your truck or bus has dual parking control valves, you can use pressure from a separate tank to: {Ans: Release the spring emergency/parking brakes to move a short distance}When brakes are applied, the brake shoes will press against the: {Ans: Brake drum or disc}Which of the following is not an air brake subsystem? {Ans: Spring brake system}During normal driving, spring brakes are usually held back by: {Ans: Air pressure}In newer vehicles, parking brakes are applied using: {Ans: A yellow diamond shaped push-knob}To test air service brakes you should: {Ans: Brake firmly while slowly moving forward}An air brake system is fully charged at what psi? {Ans: 125}If air pressure is not built up within the correct amount of time, then: {Ans: Air pressure may drop to low point while driving, requiring an emergency stop}Which one of these is NOT a