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32 terms

Air brakes

STUDY
PLAY
Modern air brake systems combine tree different systems. The systems are the service, parking and _______ brake systems.
Emergency
The driver must be able to see a warning before air pressure in the service tanks fall below ____ PSI
60
The brake pedal in an air brake system:
Controls the air pressure applied to the brakes
air braking takes more time than hydraulic braking because air:
It makes more time to flow through the lines than hydraulic fluid
If your vehicle has an alcohol evaporator, it is there to:
Reduce the risk of ice in the air brake valves in cold weather
If your truck has dual parking control valves, you can use pressure from a separate tank to:
Release the spring emergency parking brakes to move a short distance
to check the free play of manual slack adjusters on the S-cam brakes, you should park on
Level ground, chock the wheels, and turn off the parking brakes
Of the choices below, the first thing to do when a low air pressure warning comes on is:
Stop and safely park as soon as possible
The air compressor governor controls:
When air is pumped into the air tanks
The braking power of the spring brakes
Depends on whether the service brakes are in adjustment
All vehicles equipped with air brakes
A supply pressure gauge
If you must make an emergency stop, brake so you:
Can stay in a straight line and maintain steering control
If you do not have automatic tank drains, how often should you drain the oil and water from the bottom of compressed air storage tanks
At the end of each day of driving
The application pressure gauge shows how much air pressure you:
Are applying to the brakes
Your brakes are fading when:
You have to push harder on the brake pedal to control your speed on a downgrade
If your vehicle has an alcohol evaporator, everyday during cold weather you should
Check the alcohol level and fill the evaporator if needed
Why should you drain water from compressed air tanks
Water can freeze in cold weather and cause brake failure
You vehicle has a dual air brake system. If a low air pressure warning comes on for the secondary system, you should
Bring the to safe stop and continue only when fixed
During normal driving, spring brakes are usually held back by:
Air pressure
In air brake vehicles, the parking brakes should be used.
Any time the vehicle is parked
Emergency stab braking is when you;
Brake as hard as you can, release the brake when the wheels lock, then put on the brakes again when the wheels start rolling
A straight truck air brake system should not leak at a rate of more than _____ PSI per minute when the engine off and the brakes released
2
The air loss rate for a straight truck with the engine off and the brakes on should not be more than:
3 PSI in one minute
The supply gauge shows how much pressure
Is in the air tank
The brake system that applies and releases the brakes when the driver uses the brake pedal is the ___ brake system.
Service
When should you drain water from the compressed air tank?
Water can freeze in cold weather and cause brake failure
Total stopping distance for air brakes is longer than that for hydraulic brakes due to ___ distance
Brake lag
The most common type of foundation brake found on heavy vehicles is the:
S-cam drum brake
Which of the following makes total stopping distance longer for air brakes than for hydraulic brakes:
The one way check valve
If the compressor develops a leak, what keeps the air in the tanks?
The one-way check valve
WHEN AIR PRESSURE REACHES 100 PSI
AIR PRESSURE SHOULD CONTINUE TO BUILD UNTIL MY GOVERNOR CUTS OUT AROUND 120 AND 125 PSI
True or False: low Air Buzzer will not activate unless engine is running!
True