CDL AIR BRAKES PRACTICE TEST - MASSACHUSETTS
11.
When going down a steep downgrade, you should:
|
use the parking brake.
|
|
|
use a low gear, and a proper braking technique.
|
|
|
avoid braking and rely on engine braking.
|
|
|
use escape ramps whenever possible.
|
12.
The Johnson bar is a valve that:
|
works the trailer brakes.
|
|
|
is installed in the first tank the air compressor pumps air to.
|
|
|
keeps air from going out if the air compressor develops a leak.
|
|
|
reduces the braking pressure to a safe level.
|
13.
With air brake vehicles, you should use the parking brakes:
|
as little as possible.
|
|
|
only if your vehicle is equipped with ABS.
|
|
|
only during the vehicle inspection test.
|
|
|
whenever you leave the vehicle unattended.
|
14.
The air storage tanks:
|
protects the tank and the rest of the system from too much pressure.
|
|
|
are used to hold compressed air.
|
|
|
are connected to the engine through gears or a v-belt.
|
|
|
stop the compressor from pumping air.
|
15.
On
a tractor-trailer equipped with a trailer brake hand
valve, the hand valve can be used to:
|
prevent movement of cargo.
|
|
|
keep from rolling back.
|
|
|
reduce the chance of the front wheels skidding.
|
|
|
hold compressed air.
|
Next page
NOT SURE YOU WILL PASS? GET CDL PREMIUM NOW! - Learn More