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22 Cards in this Set
- Front
- Back
- 3rd side (hint)
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what Is s-cam |
S shaped device, when turned, forces the brake shoes apart |
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what are spring brakes |
part of the emergency and parking brake systems. They engage automatically if the air pressure drops below 25-40 psi |
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which knob in the cab of the truck controls the parking brake |
the diamond shaped yellow knob |
diamond |
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how can you check to see if the spring brakes are operating properly |
chock the wheels, release the parking wheels and shut off the engine |
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how quickly should a vehicle build air pressure |
from 85 to 100 PS1 in 45 seconds |
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what is the dual air brake system |
this is the type of air brake system that relies on 2 separate sets of air tanks, lines and hoses to manage a single set of brake controls. |
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if the tested brake air leakage rate is above your state's standards you should.. . |
check for leaks and have them fixed before driving them |
check |
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where is the anti lock brake indicator located |
is a yellow detector located near the rear on the drivers left side of the vehicle |
yellow |
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What causes "brake fade?" |
excessive heat build up in break shoes |
excessive heat |
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what is combination vehicle that requires a class A designation on your CDL? |
any combination of vehicles with a gross vehicle weight rating with 26,001 or more |
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What are the "service" and "emergency" lines for In a combination vehicle |
these are the air lines used to supply air to the brakes of the trailor |
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what are spring brakes |
they are the type of brakes that come on automatically in case of lost of air pressure |
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how can you test the trailor emergency brakes |
charge the trailor air brake system and make sure it rolls freely. then stop pull supply air supply control |
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why would you drop a trailor |
improper procedure and inspection of the fifth wheel while hooking up |
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what is the most over looked item on the pre-trial inspection |
the permits and the vehicle registration |
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what is the purpose of sliding a fifth wheel on a tractor |
fifth wheel allows the operator to adjust the weight of the unit |
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what Is a kingpin |
a device that protrudes downward from the upside of the front of the trailor. the kingpin slides in the 5th wheel |
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what is the purpose of the service line |
is used to supply air to the trailer brakes |
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what are the colors of the service and the emergency air lines |
service line is blue emergency line is red |
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what are the trailor air tanks used for |
used to store and supply air pressure to trailor brakes |
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what is a bobtail |
a tractor without a trailor attached |
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what is the crack the whip effect |
sudden vehicle movements while pulling double triple trailors |
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