Air brake equipped trailers made before 1975
After hooking up, you should check the fifth wheel connection by
After coupling a semi-trailer, you should crank up the front trailer supports (dollies) how?
How do you supply air to the air tank on the trailer? You supply air to the trailer tank by
A driver crosses the air lines when hooking up to an old trailer. What will happen?
You are hooking up a tractor and semi-trailer. You have connected both air lines. Before backing under the trailer you should
With the engine off and the brakes released, a combination vehicle air brake system should not leak more than how many psi in one minute?
Air lines on a combination vehicle are often colored to keep from getting them mixed up. The emergency line is ______.
When not pulling a trailer, why is it a good idea to lock the glad hands together or to a dummy coupler?
There are two things that a driver can do to prevent a rollover. They are (1) Keep the cargo as close to the ground as possible, and (2)
The hand valve should be used to park a combination vehicle when?
You are hooking a tractor to a semi-trailer and have backed up but are not under it. What should you do before backing under the trailer?
In normal driving, some drivers use the trolley (hand) valve before the brake pedal. Which of these statements is true?
The fifth wheel locking lever is not locked after the jaws close around the kingpin. This means that
_____ are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer.
After pushing in the trailer supply valve, you should not move the tractor until the whole air system is
How often should you drain your vehicle’s trailer air tanks.
The emergency air line supplies air to the trailer air tanks and
When backing up under a trailer, you should line up
How much space should be between the upper and the lower fifth wheel plates?