CDL Air Brakes Practice Test 1 with Verified Solutions

CDL Air Brakes Practice Test 1 with Verified Solutions Brake drums... A Are bolted to the wheels B Are located at each end of the vehicle's axles C Hold the brake shoes and linings D All of the above (correct answer) 2. When the low pressure warning is activated, you should... B Bring the vehicle to a safe stop while you still control the brakes 3. When the safety valve releases air it means that... A The pressure has exceeded 150 psi B Too much air is in the air compressor C Something is wrong, and you should have it checked by a mechanic D All of the above (correct answer) 4. In a single vehicle with a fully charged air system, air pressure loss (after an initial drop) should be less than... B 3 psi per minute 5. The service brake system... B applies and releases the brakes by using the brake pedal under normal driving 6. Your vehicle's single brake system needs adjustment if... C the compressor cuts out between 70 to 90 psi 7. Some air brake systems have an alcohol evaporator which helps... A Reduce the risk of ice in the air brake valves during cold weather 8. Air tanks should be drained... B Once a day 9. The safety valve in the air compressor tank is set to open at.. A 150 psi 10. Compressed air is stored... D In the storage tank 11. When you apply pressure to the brake pedal, you are.. A Pushing against a spring and against air pressure to the brakes 12. The air compressor is connected to the engine through... D Gears or a v-belt 13. Which type of brake is the most common in commercial vehicles? C S Cam brakes 14. An air pressure gauge... A