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Air Brakes Practice Question 32

Restriction L if not passedAir Brakes · Question 32

The proper sequence for the seven-step pre-trip air brake check ends with:

• AAir loss rate, low-pressure warning, spring brake test, service brake test
• BEngine running test only
• CKnock test
• DTire pressure check

Correct answer: A. Air loss rate, low-pressure warning, spring brake test, service brake test

Why: After charging the system, the pre-trip ends with: governor cut-out and cut-in, air loss rate test, low-pressure warning test, spring brake auto-application test, and service brake test.

How this question fits the Air Brakes test

An air brake failure on a loaded combination vehicle can cause runaway, jackknife, or fire. The CDL Air Brakes test exists because air systems behave very differently from hydraulic brakes — drivers must understand pressure build, air loss tolerance, and stopping distance under load.

Study technique for this topic

Memorize the seven steps of the air brake pre-trip check, the leak-down rates for single and combination vehicles, the warning signal pressure threshold, and the spring brake automatic application pressure range. Practice the order of operations — never rely on muscle memory in the booth.

Related Air Brakes practice questions

• Q24. The required leak-down test before driving consists of:
• Q38. Air brake supply pressure should generally fall between:
• Q51. When testing the spring brakes during pre-trip you should expect:
• Q2. The compressor governor controls:
• Q15. A leaking air tank with the pressure dropping rapidly while parked indicates:

Continue your CDL preparation

The Air Brakes portion of the CDL knowledge exam covers more than this single question. Use this site's full Air Brakes bank to drill every topic, then test yourself with one of our state-specific practice sets to confirm you are ready for the actual DMV exam in your state. Always check your state's CDL handbook for any local addenda before the test day.

If you are still building your overall CDL foundation, start with the General Knowledge bank — every CDL applicant must pass it — and then work outward to the endorsements you plan to add.