CDL AIR BRAKE COMPREHENSIVE SCRIPT 2026
QUESTIONS AND SOLUTIONS
◉ the braking power of the spring brakes: Answer: Depends on the
service brakes being in adjustment
◉ To check the free play of manual slack adjusters of S-cam brakes,
you should park on: Answer: Level ground, chock the wheels, and
release the parking brakes
◉ The driver must be able to see a warning before air pressure in
the service air tanks falls below _____ psi Answer: 60
◉ If you are driving down a steep downgrade and you have reached
your "safe" speed of 40 mph, you would apply the service brakes
until your speed drops to _____ mph Answer: 35
◉ Which of these is NOT a proper time to apply the parking brakes?
Answer: If the brakes are very hot (e.g. after coming down a steep
grade)
◉ Excessive heat caused by using your brakes too often can cause
the: Answer: Brakes to fade or fail
, ◉ If your truck or bus has dual parking control valves, you can use
pressure from a separate tank to; Answer: Release the spring
emergency/parking brakes to move a short distance
◉ With air brake vehicles, the parking brakes should be used:
Answer: Whenever you leave the vehicle unattended
◉ Some air brakes systems have an alcohol evaporator. What many
happen if you don't keep the unit filled with alcohol? Answer: Ice
may form in the air storage tanks and cause the brakes to fail
◉ When the brakes are applied the brake shoes (or linings) are
pressed against the: Answer: Brake drum or disc
◉ All air brake equipped vehicles have: Answer: A supply pressure
gauge
◉ Under normal conditions, in order to engage the parking brakes
the driver must first: Answer: Let the air out of the brake system
◉ Emergency stab braking is when you: Answer: Brake as hard as
you can, release the brakes when the wheels lock, then put on the
brakes again when the wheels start rolling
QUESTIONS AND SOLUTIONS
◉ the braking power of the spring brakes: Answer: Depends on the
service brakes being in adjustment
◉ To check the free play of manual slack adjusters of S-cam brakes,
you should park on: Answer: Level ground, chock the wheels, and
release the parking brakes
◉ The driver must be able to see a warning before air pressure in
the service air tanks falls below _____ psi Answer: 60
◉ If you are driving down a steep downgrade and you have reached
your "safe" speed of 40 mph, you would apply the service brakes
until your speed drops to _____ mph Answer: 35
◉ Which of these is NOT a proper time to apply the parking brakes?
Answer: If the brakes are very hot (e.g. after coming down a steep
grade)
◉ Excessive heat caused by using your brakes too often can cause
the: Answer: Brakes to fade or fail
, ◉ If your truck or bus has dual parking control valves, you can use
pressure from a separate tank to; Answer: Release the spring
emergency/parking brakes to move a short distance
◉ With air brake vehicles, the parking brakes should be used:
Answer: Whenever you leave the vehicle unattended
◉ Some air brakes systems have an alcohol evaporator. What many
happen if you don't keep the unit filled with alcohol? Answer: Ice
may form in the air storage tanks and cause the brakes to fail
◉ When the brakes are applied the brake shoes (or linings) are
pressed against the: Answer: Brake drum or disc
◉ All air brake equipped vehicles have: Answer: A supply pressure
gauge
◉ Under normal conditions, in order to engage the parking brakes
the driver must first: Answer: Let the air out of the brake system
◉ Emergency stab braking is when you: Answer: Brake as hard as
you can, release the brakes when the wheels lock, then put on the
brakes again when the wheels start rolling
