LOUISIANA CLASS D TEST EVALUATION QUESTIONS AND
ANSWERS GUARANTEE A+
✔✔service, parking, and emergency - ✔✔Air brake systems are three braking systems
combined: the ____ brake system, the ____ brake system, and the ____ brake system
✔✔Air compressor - ✔✔The part of the air brake system which pumps air into the air
storage tanks is ____
✔✔Air compressor governor - ✔✔The part of the air brake system which controls when
the air compressor will pump air into the air storage tanks is ___
✔✔Manual air tank drain - ✔✔The part of the air brake system which is operated by
turning a quarter turn or by pulling a cable and which must be drained manually at the
end of the day is ____
✔✔Automatice air tank drain - ✔✔The part of the air brake system in which water and
oil are automatically expelled is ____ (They may be equipped for manual draining as
well)
✔✔Safety valve - ✔✔The ___ part of the air brake system protects the tanks and the
rest of the system from too much pressure. it is usually set at 150 psi. if it releases air,
something is wrong
✔✔Supply pressure gauges - ✔✔This gauge shows you how much pressure is left in
the air tanks
✔✔Application pressure gauge - ✔✔This gauge shows you how much air pressure you
are applying to the brakes
✔✔60 psi - ✔✔If the air pressure in the tanks falls below ___, the low air pressure
warning will come on.
✔✔Spring brakes - ✔✔___ brakes are held back by air pressure and are the
mechanical force which keeps the emergency and parking brakes in place
✔✔Diamond shaped, yellow, pull-push control knob - ✔✔Used to engage the parking
brakes in newer vehicles with air brakes
✔✔Spring brakes - ✔✔Never push the brake pedal down when the ___ brakes are on
✔✔3; 1 - ✔✔The first step to checking the air brakes is to see if the air pressure drops
more than ____ pounds in ___ minute
, ✔✔low air pressure warning signals - ✔✔The second step to checking the air brakes is
to make sure the ____ are working
✔✔20-40 - ✔✔The third step of checking the air brakes is to make sure the parking
brake valve closes at ____psi
✔✔Air brake - ✔✔7 additional things that must be checked when doing an ______
check:
1) air compressor drive belt
2) manual slack adjusters on S-cam brakes
3) brake drums, linings, and hoses
4) rate of air pressure buildup
5) air compressor governor cut-in and cut-out pressures
6) parking brake
7) service brakes
✔✔controlled or stab - ✔✔2 methods of emergency braking are ____ or ____
✔✔Controlled braking - ✔✔The type of emergency braking in which you put on the
brakes as hard as you can without locking the wheels or turning the steering wheel (do
not turn the steering wheel while doing this)
✔✔Stab braking - ✔✔The type of emergency braking in which you press the break
pedal as hard as you can, let up when the wheels lock, and push on the brakes again
when the vehicle starts rolling
✔✔1/2 second - ✔✔With air brakes it takes ____ (or more) for the air to flow through the
lines to the brakes
✔✔Perception distance + reaction distance + brake lag distance + effective braking
distance - ✔✔The equation which equals the total stopping distance for vehicles with air
brakes is ______
✔✔Stop and safely park as soon as possible - ✔✔If the low air pressure warning for the
air brake system comes on you should __
✔✔Using them too much, engine braking, improper adjustment - ✔✔Brakes can fail or
fade from excessive heat caused by ___ and not relying on the ____ effect or ____
✔✔Very hot, very wet - ✔✔Any time you park, use the parking brakes unless:
1. The brakes are ____
2. The brakes are ____ in freezing temperatures
ANSWERS GUARANTEE A+
✔✔service, parking, and emergency - ✔✔Air brake systems are three braking systems
combined: the ____ brake system, the ____ brake system, and the ____ brake system
✔✔Air compressor - ✔✔The part of the air brake system which pumps air into the air
storage tanks is ____
✔✔Air compressor governor - ✔✔The part of the air brake system which controls when
the air compressor will pump air into the air storage tanks is ___
✔✔Manual air tank drain - ✔✔The part of the air brake system which is operated by
turning a quarter turn or by pulling a cable and which must be drained manually at the
end of the day is ____
✔✔Automatice air tank drain - ✔✔The part of the air brake system in which water and
oil are automatically expelled is ____ (They may be equipped for manual draining as
well)
✔✔Safety valve - ✔✔The ___ part of the air brake system protects the tanks and the
rest of the system from too much pressure. it is usually set at 150 psi. if it releases air,
something is wrong
✔✔Supply pressure gauges - ✔✔This gauge shows you how much pressure is left in
the air tanks
✔✔Application pressure gauge - ✔✔This gauge shows you how much air pressure you
are applying to the brakes
✔✔60 psi - ✔✔If the air pressure in the tanks falls below ___, the low air pressure
warning will come on.
✔✔Spring brakes - ✔✔___ brakes are held back by air pressure and are the
mechanical force which keeps the emergency and parking brakes in place
✔✔Diamond shaped, yellow, pull-push control knob - ✔✔Used to engage the parking
brakes in newer vehicles with air brakes
✔✔Spring brakes - ✔✔Never push the brake pedal down when the ___ brakes are on
✔✔3; 1 - ✔✔The first step to checking the air brakes is to see if the air pressure drops
more than ____ pounds in ___ minute
, ✔✔low air pressure warning signals - ✔✔The second step to checking the air brakes is
to make sure the ____ are working
✔✔20-40 - ✔✔The third step of checking the air brakes is to make sure the parking
brake valve closes at ____psi
✔✔Air brake - ✔✔7 additional things that must be checked when doing an ______
check:
1) air compressor drive belt
2) manual slack adjusters on S-cam brakes
3) brake drums, linings, and hoses
4) rate of air pressure buildup
5) air compressor governor cut-in and cut-out pressures
6) parking brake
7) service brakes
✔✔controlled or stab - ✔✔2 methods of emergency braking are ____ or ____
✔✔Controlled braking - ✔✔The type of emergency braking in which you put on the
brakes as hard as you can without locking the wheels or turning the steering wheel (do
not turn the steering wheel while doing this)
✔✔Stab braking - ✔✔The type of emergency braking in which you press the break
pedal as hard as you can, let up when the wheels lock, and push on the brakes again
when the vehicle starts rolling
✔✔1/2 second - ✔✔With air brakes it takes ____ (or more) for the air to flow through the
lines to the brakes
✔✔Perception distance + reaction distance + brake lag distance + effective braking
distance - ✔✔The equation which equals the total stopping distance for vehicles with air
brakes is ______
✔✔Stop and safely park as soon as possible - ✔✔If the low air pressure warning for the
air brake system comes on you should __
✔✔Using them too much, engine braking, improper adjustment - ✔✔Brakes can fail or
fade from excessive heat caused by ___ and not relying on the ____ effect or ____
✔✔Very hot, very wet - ✔✔Any time you park, use the parking brakes unless:
1. The brakes are ____
2. The brakes are ____ in freezing temperatures
