CDL COMBINA TION VEHICLE S
Terms in this set (49)
After coupl ing, how much
space shoul d be betw een
the upper and l ower 5th
wheel ?None
Describe what the ser vice
line is for.The ser vice l ine ( called the contr ol line ) carries air,
which is contr olled by the foot brake or the trailer hand
brake.
Depending on ho w hard you pr ess the foot brake or
hand valve, the pr essur e in the ser vice l ine will simil arily
change .
Describe what trailer air
suppl y contr ol does.You push it in to suppl y the trailer with air, and pul l it out
to shut the air off and put on the trailer emer gency
brakes.
The valve will pop out ( closing the tractor protection
valve ) when the air pressur e drops into the range of 20-
45 psi.
Fully loaded rigs are ___
times more likely to roll
over in a crash than empty
rigs.10
How can y ou test that air
flows to all trailers?Go to the rear of the rig. Open the emer gency line shut -
off valve at the rear of the last trailer.
You shoul d hear air escaping , showing the entir e system
is charged. How can y ou test the
tractor-protection valve?Push in the "air suppl y" knob, step on and off the br ake
pedal several times to reduce the air pressur e in the
tanks.
How can y ou test the trailer
emer gency brakes?Char ge the trailer air brake system and check that the
trailer rolls freely.
Then s top and pul l out the trailer air suppl y contr ol ( also
called tractor protection valve )
How can y ou test the trailer
service br akes?At normal air pressur e, release the p arking br akes. Mo ve
the vehicl e forward slowly, and apply trailer hand br ake.
How do you check for a
secur e connection?Pull tractor gentl y while the trailer brakes are still locked
to check that the trailer is locked on the trcator.
How do you know if the
trailer is at proper height?The trailer shoul d be l ow enough that it is raised sl ightly
by the tractor when the tractor is backed under it.
How much following
distance shoul d you ha ve
driving 50 mph?At least 1 second for every 10 feet of your vehicl e plus an
additional second.
How much follwoing
distance shoul d you ha ve?At leats 1 second for every 10 feet of vehicl e length
under 40 mph.
In any combina tion rig ,
allow lots of ___ distance
and l ook far ahead.Following
Large combina tion vehicl es
take longer to stop when
they are...Empty
Rollovers happen when y ou
turn too___Fast
TREU OR FALSE:
More than hal f of truck
driver deaths in crashes are
the result of truck rollovers.True
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