A Combination Vehicle Can Not Lose Air Faster Than
A dual air brake system has two systems. What are they?
Primary system
Secondary system
A combination vehicle (tractor-trailer) air brake system cannot leak more than _____PSI per minute with the engine off and the brakes released.
A straight truck or bus (single vehicle) air brake system cannot leak more than____PSI per minute with the engine off in the breaks released
A vehicle with a dual air system
Will have only one set of break controls
Air pressure loss in a combination vehicle must not exceed 1 psi per minute one pressure in on the brake pedal.
True
false
Air brake equipped vehicles must
Have an air pressure gauge, to show the pressure available for breaking
Air loss in a single vehicle should not be more than_____(after the initial pressure drop) with the engine off in the brakes on.
Air tanks should be drained at least
Air brakes cool very slowly
True
False
In a single air loss vehicle should not be more than_____(after the initial pressure drop) with the engines off and the brakes on.
Air tanks should be drained at least
Air brakes cool very slowly.
True
False
The extra time that it takes for air brakes to work when compared with hydraulic brakes is due to the time it takes for air to flow. This is called…
At 55 mph on dry pavement, the air brakes lag distant adds about 32 feet to total stopping distance.
True
False
Drum brakes are the only type of breaks in which brakes fade occurs.
True
False
During normal operations, the parking and emergency brakes are usually held back by…
Effective breaking distance is…
The distance your vehicle travels after the brakes actually apply
Emergency brakes are activated…
By a loss of air pressure
How do you check the free play in manual slack adjusters?
Pork on level ground, chock wheels, released the parking brakes, and pull slack adjuster.
If the air system should develop a leak, what will keep the air in the tanks?
If you have a dual air brake system and a low air pressure warning is activated, you…
Must stop in safely park your vehicle in get air system inspected and repaired.
If your truck does not have a dual air system in an emergency brake line ruptures…
The spring breaks will come on
If your vehicle is equipped with an alcohol evaporator, every day during winter weather you should…
Check the alcohol level and feel the evaporator, if needed
If your vehicle has an alcohol evaporator, is there too…
Reduce the risk of ice in airbrake tanks, valves, and other parts in cold weather
If your experience a sudden drop in the air system pressure you should…
Stop immediately when safe to do so
If your truck or bus has dual parking turn valves, you can use pressure from a separate tank to…
Release the spring breaks to move the vehicle and an emergency
If the lower air pressure warning comes on, you should stop in safely park your vehicle as soon as possible. True
or
False
If your vehicle pulls to one side while testing the service brakes, there may be a problem with the service brakes.
True
or
False
In air brake equipped vehicles, use the parking brakes…
Whenever you park the vehicle
Modern air brake system used three combined parking system called service, parking, and emergency.
True
False
On newer vehicles with air brakes, the parking brake control is…
A diamond-shaped, yellow, push-pull control
Parking or emergency brakes of trucks and buses can legally held
Slack adjusters on S-cam brakes need adjustment if they move more than 2 inches where the push rod attaches.
True
or
False
Some vehicles have a separate air tank which can be used to release the spring breaks
True
or
False
The air compressor governor controls…
When the compressor will pump air into the storage tanks
Controls the air pressure applied to operate the brakes
The braking power of the spring breaks…
Depends on the service brakes being in adjustment
The most common type of foundation break found on heavy commercial vehicles is
The purpose of engine retarders is to…
Help slow the vehicle while driving and reduced break wear
The air supply pressure gauge shows the driver how much pressure…
Is available in the air tanks
The spring breaks or emergency brake system…
Will work only if the brakes are adjusted properly
A warning device which you can see must come on when the air supply pressure dropped below____PSI or one half the compressor governor cut out pressure on older vehicles
The front brake limiting valves should be used…
The air loss (after initial pressure drop) for a straight truck or bus with the engine off and the brakes applied should not be more…
The alcohol evaporator condenses the air in the brake system
True
or
False
The most common type of foundation break is S-
cam drum
True
or
False
The tractor protection valve…
Is also called the breakaway valve
The governor is an air compressor regulator which controls when air the compressor will pump air into the air storage tanks
True
or
False
The total stopping distance for an average driver at 55 mph under good traction and break conditions is about 150 feet
True
or
False
The emergency brake on a heavy vehicle is usually held in place by spring pressure because air pressure Kim lost because of leakage
True
or
False
The first tank the air compressor pumps air to have a safety relief valve installed to protect the tank and to the rest of the system from too much air pressure
True
or
false
The breaking effects of the engine when going down a long and/or state downgrade may be supplemented by the use of the brakes
True
or
False
A Combination Vehicle Can Not Lose Air Faster Than
Source: https://www.flashcardmachine.com/air-brakes.html