Alabama CDL Air Brakes: Practice Test
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When only the tractor is equipped with an Anti-Lock Braking System (ABS):
There is a decreased risk of jackknifing.
There is an increased risk of jackknifing.
The brakes will not work as effectively as they would without ABS.
The brakes will become more sensitive.
In cold weather, an alcohol evaporator should be checked and filled:
Once a week.
Every day.
Every hour.
Once a month.
The service brake system:
Applies and releases the brakes when you press the brake pedal while driving normally.
Applies and releases the parking brakes.
Applies and releases the emergency brake.
Applies and releases the axle brake.
When leaving a vehicle unattended, a driver should:
Always set the parking brake.
Only set the parking brake if the vehicle is parked on a slope.
Deflate the tires by 10 percent.
Friction inside a brake drum is caused when the brake shoes and linings:
Push against each other.
Separate from the axle.
Push against the inside of the drum.
Create excess heat.
If the spring brakes are activated, you should never:
Push down the brake pedal.
Open the hood.
Release air from the air storage tanks.
Open the door to the cab.
An application pressure gauge shows:
How much air pressure is being applied to the brakes.
How much air pressure is available.
How much air pressure is required to stop a vehicle.
A slack adjuster should move no more than ____ from where it is attached to the push rod.
Two inches
Five inches
One inch
A low air pressure warning signal should activate:
When tank pressure falls below 120 psi.
When tank pressure falls below 60 psi.
When tank pressure falls below 10 psi.
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