AIR BRAKES TEST Exam Questions Correct Answers

AIR BRAKES TEST Exam Questions Correct Answers 1) Why must air tanks be drained? a) For pre trip inspection purposes b) To check for leaks c) To release oil and water buildup d) To activate the low air pressure alarm - c) To release oil and water buildup 2) What is a supply pressure gauge used for? a) To check tire pressure b) To check tank pressure c) To activate the low pressure alarm d) To check for leaks - b) To check tank pressure 4) What are spring brakes? a) Hydraulic brakes b) Air brakes 2 | P a g e Author: Katelyn Whitman. ©2025, All Rights Reserved. c) Emergency/parking brake d) Trailer brakes - c) Emergency/parking brake 5) Front wheel brakes are good under all conditions. True or False? a) True b) False - a) True You should know that your brakes are fading when? a. You have to push harder on the brake pedal to control your down hill speed b. The brake pedal feels spongy when you apply pressure c. Pressure on the brake pedal is released and speed increases - You have to push harder on the brake pedal to control your down hill speed 2. If the spring brakes are on when should you push the brake pedal? a. Only when driving down hill b. Only on a slippery road c. Never - c. Never Repeatedly pressing and releasing (fanning) the brake pedal may result in? a. A loss of air pressure b. A build up of air pressure 3 | P a g e Author: Katelyn Whitman. ©2025, All Rights Reserved. c. No change in brake air pressure - a. A loss of air pressure 4. The driver must be able to see a low air pressure warning which comes on before pressure in the service air tank falls below _______PSI a. 40 b. 60 c. 80 - b. 60 5. If your truck or bus has dual parking control valves you can use pressure from a separate tank a. To balance the service brake system when you are parked b. To stay parked twice as long without using up service air pressure c. To release the emergency/spring/parking brakes to move a short distance - c. To release the emergency/spring/parking brakes to move a short distance 6. The brake pedal in a air brake system a. Controls the speed of the air compressor b. Controls the air pressure applied to put on the brakes c. Is connected to slack adjusters by a series of rods and linkages - b. Controls the air pressure applied to put on the brakes 7. To check the free play of manual slack adjusters of S-Cam brakes, you should 4 | P a g e Author: Katelyn Whitman. ©2025, All Rights Reserved. a. Park on level ground and apply the parking brakes b. Park on a slight grade, release the parking brakes c. Park on level ground, chock the wheels, release the parking brakes and pull on the slack adjusters - c. Park on level ground, chock the wheels, release the parking brakes and pull on the slack adjusters 8. Parking or emergency brakes on trucks or buses can be legally held on by ______ Pressure. a. Spring b. Fluid - a. Spring 9. Emergency stab braking is when you a. Press hard on the brake pedal and apply full pressure on the hand valve until you stop b. Use light steady pressure on the brake pedal c. Brake as hard as you can, then release the brakes when the wheels lock up and put on the brakes again when the wheels start rolling - c. Brake as hard as you can, then release the brakes when the wheels lock up and put on the brakes again when the wheels start rolling 10. The most common type of foundation brake found on heavy vehicles is the a. Wedge drum 5 | P a g e Author: Katelyn Whitman. ©2025, All Rights Reserved. b. Disc Brake c. S-Cam - c. S-Cam 11. If your truck has dual air brake system and one of the systems is low on pressure. a. The manual slack adjusters on S-Cam brakes are not set properly b. The brake drums will not be fully operational c. Either the front or rear brakes will not be fully functional - c. Either the front or rear brakes will not be fully functional 12. The most important thing to do when a low-pressure warning light comes on is to. a. Up shift b. Down shift c. Stop and safely park as soon as possible - c. Stop and safely park as soon as possible 13.With air brake equipped vehicles, the parking brakes shou