Free Michigan (MI) CDL Air Brakes practice test 2026

The section applicants fail most often. Pressure figures differ by state manual.

What’s different in Michigan

Most Air Brakes questions are the same federal material in every state. One question in the app is written for Michigan alone, from the Michigan Commercial Driver's License Manual (2005 CDL Testing System, Rev. 03/24).

Low air warning on the written air brakes test: Before pressure drops below 60 psi. The national model manual says 55 psi.Michigan manual, section 5.1.4

A Michigan question, answer shown

On a Michigan air brake knowledge test, what pressure is given as the point the visible low air warning must come on before?

55 psi
60 psi(correct answer)
80 psi
45 psi

The manual used in Michigan sets the visible low air pressure warning at 60 psi, higher than the 55 psi in the AAMVA model manual. Older vehicles may use one half the governor cut-out pressure instead.

Handbook section 5.1.4

Practice every Michigan Air Brakes question

A sample question

One example, answer shown. Practicing the rest happens in the app.

At approximately what pressure does the air compressor governor stop pumping air into the tanks?

125 psi(correct answer)
150 psi
100 psi
60 psi

The governor 'cut-out' pressure is about 125 psi. When tank pressure falls to roughly 100 psi, the governor cuts back in and the compressor resumes pumping.

Handbook section 5.1.2

Get the app

More for Michigan

General Knowledge Combination Vehicles Pre-Trip Inspection Hazardous Materials Doubles & Triples Tank Vehicles Passenger Transport School Bus