Connecticut CDL — Air Brakes Practice Test

The Connecticut CDL — Air Brakes knowledge test has ~25 questions; you need ~20 correct (80%) to pass.

Or take one of 10 full-length practice tests

25 questions · pass with 20 correct. You get instant feedback and an explanation after every answer.

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The full-length test, with feedback and an explanation after every answer.

Connecticut CDL — Air Brakes practice tests

10 full-length practice tests, each with 25 questions and a pass mark of 20, like the real test. You see the answers and explanations after you grade.

Test 1
25 questions · pass with 20
How are spring brakes held in the released position while you drive?
Test 2
25 questions · pass with 20
Why may a heavily loaded truck need a very long distance to stop once the spring brakes apply by themselves?
Test 3
25 questions · pass with 20
When should you NOT set the parking brakes?
Test 4
25 questions · pass with 20
What describes the controlled braking method?
Test 5
25 questions · pass with 20
On a tractor, truck, or bus, where is the yellow ABS malfunction lamp located?
Test 6
25 questions · pass with 20
What is a modulating control valve on the dash used for?
Test 7
25 questions · pass with 20
How do air brakes actually generate their stopping force?
Test 8
25 questions · pass with 20
With a manual transmission, when should you push in the clutch during a normal stop?
Test 9
25 questions · pass with 20
The governor lets the compressor begin pumping again once tank pressure falls to what level?
Test 10
25 questions · pass with 20
As overheated brake drums expand, what happens to braking performance?