CDL - Class A Permit Study Guide – Alabama with
all Correct & 100% Verified Answers |Latest
Version |Already Graded A+
During normal driving, spring brakes are usually held back by: ✔Correct Answer-air pressure
The brake pedal in an air brake system: ✔Correct Answer-Controls the air pressure applied to put
on the brakes
The brake system that applies and releases the brakes when the driver uses the brake pedal is what
system? ✔Correct Answer-service system
All air braked equipped vehicles must have what? ✔Correct Answer-A supply pressure gauge
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:
✔Correct Answer-release the spring brakes to move the vehicle in an emergency
The most common type of foundation brake found on heavy vehicles is the: ✔Correct Answer-s-
cam drum brake
Parking or emergency brakes of trucks and buses can be legally held on by ✔Correct Answer-spring
pressure
If your vehicle has an alcohol evaporator, it is there to: ✔Correct Answer-reduce the risk of ice in
valves and other parts in cold weather
Some air brake systems have an alcohol evaporator. What may happen if you don't keep the unit
filled with alcohol? ✔Correct Answer-ice may form in the tanks and cause the breaks to fail
The most important thing to do when the low air pressure warning comes on is: ✔Correct Answer-
stop and park safely as soon as possible
The driver must be able to see a low air pressure warning that must come on before pressure in the
tanks fall below what? ✔Correct Answer-60 psi
Under normal conditions, in order to engage the parking brake the driver must: ✔Correct Answer-
let the air out of the system
To check the free play of manual slack adjustors on s-cam brakes, you should park on: ✔Correct
Answer-level ground, clock the wheels, and release the parking brakes
If your vehicle has an alcohol evaporator, every day during cold weather you should: ✔Correct
Answer-check and fill the alcohol level
For air brake systems in good condition, the air compressor should start pumping at ✔Correct
Answer-100 psi
, A straight truck or bus system should not leak at a rate of more than ✔Correct Answer-2 psi per
minute with the engine off and brakes released
A slack adjustor probably needs adjustment if it moves more than ✔Correct Answer-1 inch when
you pull on it
If you are driving down a steep downgrade and you have reached your safe speed of 40 mph, you
should apply the service brakes until your speed reaches what? ✔Correct Answer-35 mph
The use of brakes on a long and/or step downgrade is only a supplement to: ✔Correct Answer-the
braking effect of the engine
Under ideal conditions, a truck with air brakes going 55 mph would require a stopping distance of
what? ✔Correct Answer-more than 300 feet
Emergency stab braking is when you: ✔Correct Answer-Brake as hard as you can, release the
brakes when the wheels lock, put on the brakes again when the wheels start rolling
The braking power of the spring brakes: ✔Correct Answer-Depends on the service brakes being in
adjustment
If you must make an emergency stop, brake so you: ✔Correct Answer-Can steer and your vehicle
stays in a straight line and turn if it becomes necessary
The proper method of braking when going down hills is: ✔Correct Answer-to reduce your speed by
5 mph below your safe speed before releasing the brakes
ABS changes : ✔Correct Answer-the way you brake in an emergency
If your ABS is not working, you should: ✔Correct Answer-Drive normally, but get the system
serviced soon
The stop light switch: ✔Correct Answer-Turns on the brake lights to warn drivers behind you.
If air pressure does NOT build up to normal within the correct amount of time: ✔Correct Answer-
your air pressure may drop too low while driving, requiring an emergency stop
If the spring brakes are on, when should you push the brake pedal? ✔Correct Answer-never
If your truck's air compressor has its own oil supply, when should you first check the oil level?
✔Correct Answer-before driving
the safety valve is set automatically to reduce pressure in the tanks at what psi? ✔Correct Answer-
150 psi
The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more
than what? ✔Correct Answer-3 psi in 1 minute
Air brakes take longer to stop than hydraulic brakes because... ✔Correct Answer-air takes more
time to flow through the lines than hydraulic fluid
all Correct & 100% Verified Answers |Latest
Version |Already Graded A+
During normal driving, spring brakes are usually held back by: ✔Correct Answer-air pressure
The brake pedal in an air brake system: ✔Correct Answer-Controls the air pressure applied to put
on the brakes
The brake system that applies and releases the brakes when the driver uses the brake pedal is what
system? ✔Correct Answer-service system
All air braked equipped vehicles must have what? ✔Correct Answer-A supply pressure gauge
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:
✔Correct Answer-release the spring brakes to move the vehicle in an emergency
The most common type of foundation brake found on heavy vehicles is the: ✔Correct Answer-s-
cam drum brake
Parking or emergency brakes of trucks and buses can be legally held on by ✔Correct Answer-spring
pressure
If your vehicle has an alcohol evaporator, it is there to: ✔Correct Answer-reduce the risk of ice in
valves and other parts in cold weather
Some air brake systems have an alcohol evaporator. What may happen if you don't keep the unit
filled with alcohol? ✔Correct Answer-ice may form in the tanks and cause the breaks to fail
The most important thing to do when the low air pressure warning comes on is: ✔Correct Answer-
stop and park safely as soon as possible
The driver must be able to see a low air pressure warning that must come on before pressure in the
tanks fall below what? ✔Correct Answer-60 psi
Under normal conditions, in order to engage the parking brake the driver must: ✔Correct Answer-
let the air out of the system
To check the free play of manual slack adjustors on s-cam brakes, you should park on: ✔Correct
Answer-level ground, clock the wheels, and release the parking brakes
If your vehicle has an alcohol evaporator, every day during cold weather you should: ✔Correct
Answer-check and fill the alcohol level
For air brake systems in good condition, the air compressor should start pumping at ✔Correct
Answer-100 psi
, A straight truck or bus system should not leak at a rate of more than ✔Correct Answer-2 psi per
minute with the engine off and brakes released
A slack adjustor probably needs adjustment if it moves more than ✔Correct Answer-1 inch when
you pull on it
If you are driving down a steep downgrade and you have reached your safe speed of 40 mph, you
should apply the service brakes until your speed reaches what? ✔Correct Answer-35 mph
The use of brakes on a long and/or step downgrade is only a supplement to: ✔Correct Answer-the
braking effect of the engine
Under ideal conditions, a truck with air brakes going 55 mph would require a stopping distance of
what? ✔Correct Answer-more than 300 feet
Emergency stab braking is when you: ✔Correct Answer-Brake as hard as you can, release the
brakes when the wheels lock, put on the brakes again when the wheels start rolling
The braking power of the spring brakes: ✔Correct Answer-Depends on the service brakes being in
adjustment
If you must make an emergency stop, brake so you: ✔Correct Answer-Can steer and your vehicle
stays in a straight line and turn if it becomes necessary
The proper method of braking when going down hills is: ✔Correct Answer-to reduce your speed by
5 mph below your safe speed before releasing the brakes
ABS changes : ✔Correct Answer-the way you brake in an emergency
If your ABS is not working, you should: ✔Correct Answer-Drive normally, but get the system
serviced soon
The stop light switch: ✔Correct Answer-Turns on the brake lights to warn drivers behind you.
If air pressure does NOT build up to normal within the correct amount of time: ✔Correct Answer-
your air pressure may drop too low while driving, requiring an emergency stop
If the spring brakes are on, when should you push the brake pedal? ✔Correct Answer-never
If your truck's air compressor has its own oil supply, when should you first check the oil level?
✔Correct Answer-before driving
the safety valve is set automatically to reduce pressure in the tanks at what psi? ✔Correct Answer-
150 psi
The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more
than what? ✔Correct Answer-3 psi in 1 minute
Air brakes take longer to stop than hydraulic brakes because... ✔Correct Answer-air takes more
time to flow through the lines than hydraulic fluid
