CDL Air Brake PSI Drill

What this drill covers

Each round mixes 8 questions (about 90 seconds) on the low-air warning, when the spring brakes apply, the static and applied leak limits, governor cut-out and cut-in, air build-up time and slack adjuster travel, plus putting the SALE in-cab test and other air-brake checks in order. Every answer explains the number. The drill is free; the first time, enter your email to start, and we send study tips and a PSI cheat sheet. For the full test, see the Pre-Trip Inspection practice ($99, 10 days).