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Air Brakes Practice

CDL

QuestionAnswer
Which of the following is okay to find in the air brake system? AIR
Air loss in a single vehicle (not a combination unit) should not be more that _________ with the engine off and the brakes on. 3 psi in one minute
The vehicle must have a warning device which comes on when the air pressure in the air tanks falls below: 60 psi
If the air system should develop a leak, what will keep air in the air tanks? The one-way check valve
Which brake system applies and releases th brakes when the driver uses the brake pedal? The SERVICE brake system
When using the parking brakes or emergency brakes, what type of pressure is being used? SPRING PRESSURE
The aire loss rate for a straight truck or bus with the engine off and the brakes applied should not be more than: 3 psi in one minute
Air brake equipped vehicles must have: An air pressure gauge, to show th pressure available for braking
Which of the following statements about brakes is true? The heavier a vehicle or the faster it is moving, the more heat the brakes have to absorb to stop it.
Three different systems are found on modern air brake systems: service brakes, parking brakes, and ________________ EMERGENCY BRAKES
The purpose of engine retarders is to: Help slow the vehicle while driving and reduce brake wear
To use the STAB braking technique during emergecy braking, you: BRAKE HARD with the pedal until the WHEELS LOCK, then get off the brakes until the wheels begin to roll again
If your vehicle has an alcohol evaporator, it's there to: Reduce the risk of ICE in the air brakes valves in cold weather
If your vehicle is equipped with an alcohol evaporator, every day during the winter you should: CHECK the alocohol level and fill if necessary
The air supply pressure gauge shows the driver how much pressure: is AVAILABLE in the air tanks
The most common type of foundation brake found on heavy commercial motor vehicles is: S-CAM DRUM
A straight truck of bus air brake system cannot leak more that how many psi per minute WITH THE ENGINE OFF AND THE BRAKES RELEASED? 2 PSI
How do you check the free-play in manual slack adjusters? Park on level ground, chock wheels, release the parking brakes and pull slack adjusters
Which of the following answers is most correct about brake use on a long and steep downgrade? Use the braking effects of the engine, and when the vehicle speed reaches the "safe" speed, apply brakes firmly until vehicle speed is reduced to approximately 5 mph below "safe" speed
When a failure occurs in the service brake system, the system you need to use to stop the vehicle is the: EMERGENCY BRAKE SYSTEM
If your truck or bus has dual parking control valves, you can use pressure from a seperate tank to: RELEASE the emergency brakes to moce a short distance
The AIR COMPRESSOR GOVERNOR controls: When the compressor will pump air into the storage tanks
When you have to make a quick emergency stop, you should brake in a way that allows you to: Continue in a straight line and maintain steering control
What turns on the electrical stop light switch in an air brake system? AIR PRESSURE
In air brake equipped vehicles, you use the parking brakes when? Whenever you PARK the vehicle
What will determine how effectively the spring emergency brakes or the parking brakes work? THE ADJUSTMENT OF THE SERVICE BRAKES
A combination vehicle air brake system cannot leak more than how many psi per minute with the engine off and the brakes released? 3 psi
The brake pedal: CONTROLS the AIR PRESSURE applied to operate the BRAKES
During normal operations, the parking and emergency brakes are usually held back by: AIR PRESSURE
Why should you not fan the brakes on and off during long downgrades? The short time off the brakes does not allow for brake cooling
Created by: zedoc43
 

 



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