Combination Vehicles
Combination Brakes
Coupling and Uncoupling
Doubles or Triples
Tank Vehicles
100
The two things that are important to prevent rollover.
What is keep the cargo as close to the ground as possible, and drive slowly around turns?
100
This should only be used to test the trailer brakes.
What is the trailer hand valve?
100
The trailer may strike and damage the trailer nose.
What if the trailer is too low?
100
You must steer gently and go slowly around corners, on ramps, off ramps, and curves.
How can your prevent trailers from rolling over?
100
These control the forward and backward liquid surge.
What are baffles?
200
When you turn suddenly while pulling doubles, this trailer is most likely to turn over.
What is the rear trailer?
200
What is the trailer air supply control?
200
There should be none of this between the upper and lower fifth wheel.
After coupling, how much space should be between the upper and lower fifth wheel?
200
Never park a Double or Triple in this spot.
What is where you cannot pull all the way through?
200
This makes the vehicle top-heavy and easy to roll over.
What is the high center of gravity?
300
Don't use the trailer hand brake to straighten out a jackknifing trailer.
What caused the wheels to skid?
300
This is controlled by the foot brake or the hand valve.
What is the service air line?
300
The trailer may not couple correctly.
What if the trailer is too high?
300
Coupling device of one or two axles and a fifth wheel by which a semitrailer can be coupled to the rear of a tractor-trailer combination forming a double bottom.
What is a dolly?
300
Keep a steady pressure on the brakes. Do not release too soon when coming to a stop. Brake far in advance of a stop and increase your following distance.
What is controlling surge?
400
When a vehicle goes around a corner, the rear wheels follow a different path than the front wheels.
What is off tracking?
400
This caused the trailer emergency brakes to come on.
What is the loss of air power?
400
Look under the vehicle for the ECU and wheel speed sensor wires coming from the back of the brakes.
How do you know if the unit has anti lock brakes ABS?
400
This should pop out (or go from "normal" to "emergency" position) when the air pressure falls into the pressure range specified by the manufacturer. (Usually within the range of 20 to 45 psi.)
What is the trailer air supply valve?
400
Never load a cargo tank totally full. Liquids expand as they warm and you must leave room for the expanding liquid.
What is Outage?
500
Low slung units (lowboy, car carrier, moving van, possum-belly livestock trailer). Single-axle tractor pulling a long trailer with its landing gear set to accommodate a tandem-axle tractor.
What trailers can get stuck on raised crossing?
500
Use these when you park trailers without spring brakes.
What are chocks?
500
You should lift the trailer supports (landing gear) this high?
What is all the way up?
500
Check for normal air pressure, release the parking brakes, move the vehicle forward slowly, and apply trailer brakes with the hand control (trolley valve), if so equipped. You should feel the brakes come on. This tells you the trailer brakes are connected and working.
What is test trailer service brakes?
500
what happens when you steer, over accelerate, or over brake.
What is a skid?