CDL Air Brake Questions and Answers 100% Pass

CDL Air Brake Questions and Answers 100% Pass Modern air brake systems combines three different systems. service brakes, parking brakes, and emergency brakes Oil and water usually collect in compressed air tanks. If you do not have an automatic tank drain, when should you drain the air tanks? After every working day. Why drain water from the compressed air tanks? Water can freeze in cold weather and cause brake failure. Air brake equipped vehicles must have: A supply pressure gauge. What can legally hold a parking or emergency brake in position for a truck, truck tractor or bus? Spring pressure Air loss in a straight truck or bus should not be more than ____ with the engine off and the brakes on. 3 psi in one minute To make an emergency stop with air brakes, using the stab braking method, you should: Brake as hard as you can, get off the brakes when the wheels lock, get back on the brakes when the wheels start rolling again. You should know that your brakes are fading when: You have to push harder on the brake pedal to control your speed on a downgrade. To check the free play of manual slack adjusters on s-cam brakes you should: Park on level ground, chock the wheels, and release the parking brakes. If the air compressor should develop a leak, what keeps the air in the tanks? The one way check valve When driving down a long steep hill you should: Release the brake when you are 5 M.P.H. below your safe speed. The brake system that applies and releases the brakes when the driver uses the brake pedal is the: Service brake system. The most common type of foundation brakes found on heavy vehicles is the: S-cam drum Vehicles 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 that is given before air pressure in the service air tanks falls below: 60 psi What makes the total stopping distance for air brakes longer than that for hydraulic brakes. Brake lag distance. The first thing to do when a low air pressure warning comes on is: Stop and safely park as soon as possible. The braking power of the spring brakes: