Air Brakes Practice Test I Questions With Complete Solutions

Air Brakes Practice Test I Questions With Complete Solutions Oil and water usually collect in compressed air tanks. If you do not Automatic tank drain, when should you drain the air tanks? A.After every working day. b. After every four hours of service. c. Once a week. - ANSWER- A Why drain water from the compressed air tanks? a. To keep from fouling the air compressor oil B Water can freeze in cold weather and cause brake failure. C. The low boiling point of water reduces braking power. - ANSWER- B The air brake system for a straight truck or bus should not leak at a rate of more than __ psi per minute with the engine off and the brakes released. a. 1 b 2 c 3 - ANSWER- 2 To make an emergency stop with air brakes, using the stab braking method, you should: a. Pump the brake pedal rapidly and lightly. b. Brake hard until the wheels lock, and then get off the brakes for as much time as the wheels were locked. c Press on the brake pedal as hard as you can, release the brakes when the wheels locked, put on the brakes again when the wheels start rolling. - ANSWER- C You should know that your brakes are fading when: a. Pressure on the brake pedal is released and speed increases. b You have to the brake pedal harder to control speed on a downgrade. c The brake feels spongy when pressure is applied. - ANSWER- B