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Air Brakes System Test
Mann Driving School "Student Study"
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What is the most effective way to drain the air tank?
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0 points
Drain the tanks until they are empty and close the drain value
Fully open the drain valves and leave them open
Crack the drain valve fo a quic air pressure discharge
Drain the tanks until they are half empty
A normal brake application will give you an accurate feel as to whether the brakes are properly adjusted
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False
True
Maybe
All are correct
Pulling the park control valve (yellow button) on a tractor trailer unit will
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Apply both the tractor and trailer spring park brakes
Trailer spring park brakes only
Tractor spring park brakes only
All are correct
Air tanks must be drained regularly because
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Tanks will over heat
Tanks filled up with too much pressure
Moisture and contamination collect
Air compressor will pump more quickly
When adjusting the manual slack adjuster which of the following will confirm that the adjusting bolt is being turned correctly
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The 5-cam shaft will rotate clockwise
The push rod will pull out of the chamber
The S- cam shaft will rotate counter-clockwise
The S•cam shaft will rotate the same way as if a brake application was made
Brake chambers create greater application force if
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The diaphragm surface area is increased and air pressure is increased
The diaphragm surface area is decreased and air pressure is decreased
The diaphragm surface area is increased/decreased and air pressure is increased/decrease
All are correct
When a spring park brake chamber has been disabled by caging bolt
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The spring park brake will still apply
The service brake will not apply
The service brake will not release
The spring park brake will not apply
When air loss from air brake system exceeds the prescribed as limits
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The vehicle cannot drive on any highway or road
The vehicle must be driven to nearest service station
The vehicle must be driven on secondary roads
The vehicle must be driven slowly on the highway
When an air brake air supply is out of adjustment
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It must be corrected at the next time the vehicle is serviced
It must be corrected before entering an inspection station
It must be corrected at the next annual inspection
The vehicle must not be driven or operated on any road or highway
Air tanks must be drained at least:
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Daily
Monthly
Weekly
During an oil change
When the Trailer couplers or glad hands are cross connected
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The trailer spring park brakes will release and function correctly
The trailer spring park brake will not release
Trailer service brakes will function correctly
All are correct
A red trailer supply line failure of an operating Tractor Trailer Unit with spring park brakes released will result in
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The application of trailer spring park brakes
The application of both Tractor and trailer spring park brakes
The application of Tractor service brakes
The application of tractor spring park brakes
When a trailer's service brakes fail to apply, the trailer spring park brakes can be applied using the:
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Trailer hand valve
Brake pedal
Trailer protection valve
Trailer air supply valve
Vehicle with an air brake system must have air pressure guage that indicate the air pressure level in:
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Both service tanks
The air compressor
The air pressure governor
The Brake chamber
An antilock braking system (ABS) failure is recognized by:
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A warning light on the dash that comes on or the light near the rear of the left side of the trailer staying on when the brakes are applied
Warning light on the dash going out or the right near the rear of the left side of the trailer turns off when the brakes are applied
Brakes feeling spongy
Hazard lights automatically on
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