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warning signals must be places ___ behind and ___ in front of the vehicle and one ____
to the front or rear on the side of the vehicle facing traffic when it breaks down -
ANSWERS 100 ft, 100ft, 10ft
the draw bar used to tow another vehicle must not be more than ___ except when
transporting objects which can not be easily dismembers like poles, pipes, or machinery
-ANSWERS 15 ft
the rear view mirror must reflect an image reaching at least ____ behind the vehicle -
ANSWERS 200ft
vehicles weighing or carrying more than ___ must be equipped with extra brakes -
ANSWERS 3,000 pounds
___ brakes are a safe way of stopping large vehicle when used correctly -ANSWERS
air
the three braking systems that make up an air brake system are -ANSWERS service
brake, parking brake, and emergency brake
the part of the air brake system which pumps air into the air storage tanks -ANSWERS
air compressor
the part of the air brake system which controls when the air compressor will pump air
into the air storage tanks -ANSWERS air compressor governor
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 -ANSWERS manual
air tank drain
the part of the air brake system in which water and oil are automatically expelled -
ANSWERS automatice air tank drain
the ___ 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 -
ANSWERS safety valve
, the ___ part of the air brake system tells you how much pressure is left in the air tanks -
ANSWERS supply pressure gauges
the ____ shows you how much air pressure you are applying to the breaks -ANSWERS
application pressure gauge
if the air pressure in the tanks falls below ___, the low air pressure warning will come
on. -ANSWERS 60psi
___ brakes are held back by air pressure and are the mechanical force which keeps the
emergency and parking brakes in place -ANSWERS spring brakes
in newer vehicles, you engage the parking brakes by using this knob -ANSWERS
diamond-shaped, yellow, push-pull knob
never push the break pedal down when the ___ brakes are on -ANSWERS spring
brakes
the first step to checking the air brakes is to see if the air pressure drops more than
____ pounds in ___ minute -ANSWERS 3 pounds in 1 minute
the second step to checking the air brakes is to ____ -ANSWERS make sure the low
air pressure warning signals are working
the third step of checking the air brakes is to make sure the parking brake valve closes
at ____psi -ANSWERS 20-40 psi
7 additional things that must be checked when doing an air brake check -ANSWERS
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
2 methods of emergency breaking -ANSWERS controlled or stab
the type of emergency breaking in which you put on the brakes as hard as you can
without locking the wheels or turning the steering wheel -ANSWERS controlled 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