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