CDL AIR BRAKES QUESTIONS AND ANSWERS ALREADY PASSED

CDL AIR BRAKES QUESTIONS AND ANSWERS ALREADY PASSED When your vehicle is empty, start braking: Sooner than when loaded Modern air brake systems combine three different systems. They are the service brakes, the parking brakes and the : Emergency brake What does the air compressor governor do? It controls when air is pumped into the air tanks Oil and water that collects in air tanks can make brakes fail. If you do not have automatic tank drains, when should you drain the air tanks? Every day If your vehicle has an alcohol evaporator, why is it there? To reduce the risk of ice in air brake valves in cold weather The brake pedal in an air brake system: Controls the air pressure applied to put on brakes If your vehicle has an alcohol evaporator, everyday during cold weather what should you do? Check and fill the alcohol level Why drain water from compressed air tanks? Water can freeze in cold weather and cause brake failure Vehicle with air brakes must have: An air pressure gauge to show the pressure available for braking The driver must be able to see a warning light that is given when air pressure in the service tanks falls bellow: 60 PSI During Normal driving, parking and emergency brakes are usually held back by? Air pressure The parking and emergency brake on a heavy vehicle can only be held in position by something that can not leak away such as: Spring pressure What does the application pressure gauge shows you? It shows how much air pressure you are applying to the brakes Front brake limiting valves are used to: Reduce the chance of front wheel skids If your truck or bus has dual parking control valves, you can use pressure from a separate tank for what purpose? To release the emergency parking brakes to move a short distance The braking power of the spring brakes: Depends on the adjustment of the service brakes In air brake vehicles, the parking brakes should be used how? Any time the vehicle is parked To check for free play in a manual slack adjuster, you need: Park on level ground, chock the wheels and release parking brakes Your vehicle has a dual air brake system. If a low air warning comes on for the secondary system, what should you do? Bring the vehicle to a safe stop and continue only when system is fixed A straight truck or bus with air brake system, whit engine off and brakes released should not lose more than: 2 PSI ( Rule: If your brakes are applied or being used, add 1) A combination vehicle with air brake system with the engine off and brakes released, should not lose more than: 3 PSI (Rule: If your brakes are applied or being used, add 1 PSI) If you make an emergency stop, how should you brake? You brake so you can steer and your vehicle stays in a straight line