Free Wisconsin (WI) CDL Air Brakes practice test 2026

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

What’s different in Wisconsin

Most Air Brakes questions are the same federal material in every state. One question in the app is written for Wisconsin alone, from the Wisconsin Commercial Driver's Manual.

Low air warning on the written air brakes test: Before pressure drops below 60 psi. The national model manual says 55 psi.Wisconsin manual, section 5.1.4
Skills test version: The modernized skills test, since November 4, 2024.Wisconsin's CDL manual and licensing pages

A Wisconsin question, answer shown

Wisconsin's manual states the low air pressure warning must come on before tank pressure drops below what figure?

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

The manual used in Wisconsin 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 Wisconsin 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

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