CDL Air Brakes Test Questions and Answers 100% Pass

CDL Air Brakes Test Questions and Answers 100% Pass To test air service brakes you should: Brake firmly while slowly moving forward The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below ____ psi 60 If your vehicle has an alcohol evaporator, every day during cold weather you should: Check and fill the alcohol level All air brakes equipped vehicles have: A supply pressure gauge The most common type of foundation brake found on heavy vehicles is the: S-cam drum Modern air brakes combine three different systems. They are the service, the parking, and the ___ brakes. Emergency To check the free play of manual slack adjusters of s-cam brakes, you should park on: Level ground, chock the wheels and release parking breaks Why should you drain water from compressed air tanks? Water can freeze in cold weather and cause brake failure The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below____ psi 20 With air brake vehicles, the parking brake should be used: Whenever you leave the vehicle unattended The safety valve is set automatically when pressure is 150 Repeatedly partially increasing and pressing the brake pedal may result in: A loss of air brake pressure If your truck has dual air brake system, and one of the systems loses its pressure, what will happen? Either the front or rear brakes will not be fully functional If you must make an emergency stop, you should brake so you: Can steer and so your vehicle stays in a straight line The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than: 3 psi in one minute You brakes are fading when: You have to push harder on a brake pedal to control your speed on a downgrade Which one of these is NOT a proper time to apply the parking brakes? If the brakes are very hot The braking power of the spring brakes: Depends on the service brakes being in adjustment Your truck or bus has a dual air brake system. If a low pressure warning comes on for only one system, what should you do? Bring your vehicle to a complete stop right away and safely park. Continue only after the system is fixed