The air loss rate for a straight truck or bus with the engine off and the brakes applied should not be more than
Why should you not fan the brakes on and off during long downgrades?
What turns on the electrical stop light switch in an air brake system?
Air brake equipped vehicles must have
Which of the following is O.K. to find in the air brake system?
The vehicle must have a warning device which comes on when the air pressure in the service air tanks falls below
If the air system should develop a leak, what will keep the air in the air tanks?
You must make a quick emergency stop. You should brake so you
What will determine how effective the spring emergency brakes or the parking brakes work?
If your vehicle is equipped with an alcohol evaporator, every day during the winter weather you should
Which of the following statements about brakes is true?
During normal operations, the parking and emergency brakes are usually held back by
Which brake system applies and releases the brakes when the driver uses the brake pedal?
Which of the following answers is most correct about using brakes on a long and/or steep downgrade?
To use the stab braking technique during emergency braking, you
A straight truck or bus air brake system cannot leak more than ______ psi per minute with the engine off and the brakes released.
The air compressor governor controls
A combination vehicle air brake system cannot leak more than ______ psi per minute with the engine off and the brakes released.
If your vehicle has an alcohol evaporator, it is there to
When a failure occurs in the service brake system, the system you need to stop the vehicle is the
When using the parking brakes or emergency brakes, what type of pressure is being used?
Three different systems are found on modern air brake systems; service brakes, parking brakes, and the
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to
How do you check the free play in manual slack adjusters?
The most common type of foundation brake found on heavy commercial vehicles is
The air supply pressure gauge shows the driver how much pressure
In air brake equipped vehicles, you use the parking brakes when?
Air loss in a single vehicle (not a combination unit) should not be more than ______ with the engine off and the brakes on.
The purpose of engine retarders is to