CDL - Class A Permit Study Guide – Alabama Prep Exam Questions Fully Solved.
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Course
CDL Class A License
Institution
CDL Class A License
During normal driving, spring brakes are usually held back by: - Answer air pressure
The brake pedal in an air brake system: - 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 s...
CDL - Class A Permit Study Guide –
Alabama Prep Exam Questions Fully
Solved.
During normal driving, spring brakes are usually held back by: - Answer air pressure
The brake pedal in an air brake system: - 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? - Answer service system
All air braked equipped vehicles must have what? - Answer A supply pressure gauge
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to: -
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: - Answer s-cam drum brake
Parking or emergency brakes of trucks and buses can be legally held on by - Answer spring pressure
If your vehicle has an alcohol evaporator, it is there to: - 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? - 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: - 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? - Answer 60 psi
Under normal conditions, in order to engage the parking brake the driver must: - 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: - 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: - Answer check
and fill the alcohol level
For air brake systems in good condition, the air compressor should start pumping at - Answer 100 psi
A straight truck or bus system should not leak at a rate of more than - Answer 2 psi per minute with the
engine off and brakes released
A slack adjustor probably needs adjustment if it moves more than - 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? - Answer 35 mph
The use of brakes on a long and/or step downgrade is only a supplement to: - 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?
- Answer more than 300 feet
Emergency stab braking is when you: - 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: - Answer Depends on the service brakes being in adjustment
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