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if your truck or bus has dual parking control valves it means that you can use pressure from a separate tank to
release the spring brakes to move a short distance
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a striaght truck or bus air brakessystem should not leak at a rate of more than ____ psi per minute with the engine off and the brakes released.
2
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if your vehicle has an alcohol evaporator, it is there to :
reduce the risk of ice in air brakes valves in cold weather
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if you must make an emergency stop you should brake so that you:
stay in a straight line and can steer
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your truck or bus has a dual brake system. if a low air pressure warning comes on for only one system, what should you do?
stop. safely park, and continue only after the system is fixed.
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if your vehicle has an alcohol evaporator, every day during cold weather you should:
check and fill the alcohol level
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during normal driving, spring brakes are usually held back by :
air pressure
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air brakes takes more time than hydraulic braking because air brakes:
need to have airflow through the lines to work
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in air brakes vehicles, the parking brakes should be used:
whenever the vehicle is parked.
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the brake pedal in an air brake system:
controls the air pressure applied to put on the brakes.
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which of the fooling makes the total stopping distance for air brakes longer than for hydraulic brakes.
brake lag distance
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of the choices below , the first thing to do when a low air pressure warning come on is :
stop and safely park as soon as possible
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the braking power of the spring brakes:
depends on the adjustment of the service brakes
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the air compressor governor controls:
when air is pumped onto the air tanks
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the application pressure guage shows the driver how much pressure:
is being applied to the brakes.
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when driving down a long steep hill you should:
release the brake when u are 5mph below your
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the brakes systems that applies and releases the brakes when the driver uses the brake pedal is the :
service brake system
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the most common type of foundation brakes found on heavy vehicles is the:
s-cam drum
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vehicles with air brakes must have:
an air pressure guage to show the pressure avaiable for braking.
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the driver must be able to see a warning that is given before air pressure in the service air tanks falls below:
60psi
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air loss in a straight truck or bus should not be more than ___ with the engine off and the brakes on.
3 psi in one minute
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to make an emergency stop with air brakes, using the stab braking method, you should:
brake as hard as you can,get off the brakes when the wheels lock,get back on the brakes when the wheels start rolling again.
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you should know that your brakes are fading when:
you have to push harder on the brake pedal to control to control your speed on a downgrade.
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to check the free play of manual slack adjusters on s-cam brakes you should:
park on level ground, chock the wheels, and release the parking brakes.
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if the air compressor should develop a leak, what keeps the air in the tanks?
the one way check valve
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