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Free Ohio CDL Air Brakes practice test 2026

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

A sample question

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

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

  1. 125 psi(correct answer)
  2. 150 psi
  3. 100 psi
  4. 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