Ace Your DMV Written Test with our Guaranteed Cheat Sheet.
Cheat Sheet

Alabama CDL Permit Test - Air Brakes

Number of questions: 25
Passing score: 20
Directions: This endorsement is required for driving a vehicle with air brakes. To receive this endorsement, applicants must pass a written test. The test consists of 25 multiple choice questions. Each question has three or four answer choices. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the Alabama Commercial Driver License Manual. Questions come from the chapter covering: Air Brakes. The Air Brakes endorsement may be used with the Class A, B or C CDL.
You have made error so far
Passing grade —
5 or fewer errors
advertising
1.
Brake fading is caused when:
Brakes are not used often enough.
Brakes overheat.
Brakes are too cold.
Brakes are wet.
2.
If the low air pressure warning signal comes on, you should:
Continue driving, but have the brakes repaired within a week.
Pull over and inspect the brakes.
Phone a mechanic while driving.
3.
If using air tanks with manually operated drains, how often should you drain the tanks?
Every day
Once a week
Once a month
Once every 3,000 miles
4.
Before a vehicle with dual air brakes is driven, pressure of at least ____ should be built up in both braking systems.
10 psi
25 psi
50 psi
100 psi
5.
Pressing and releasing a brake pedal unnecessarily can:
Release air faster than it can be replaced.
Add more air to the braking system.
Make the brake pedal more sensitive.
Create a loud noise.
6.
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.
When tank pressure falls below 5 psi.
Our Latest Videos

Wait, before you go

Ace your DMV Written Test with our Guaranteed Cheat Sheet.

  • Cheat Sheets Save Time
  • Cheat Sheets pass on your first try