Air Break Practice Test

Results

#1. Air pressure must rise _____________ with the engine idling at 600–900 rpm within 2 minutes.

From 120 psi to 135 psi

From 100 psi to 120 psi

From 50 psi to 80 psi

From 85 psi to 100 psi

To test the air pressure build-up time, start by reducing the pressure to below 552 kPa (80 psi). If the vehicle has a trailer attached, ensure the trailer supply valve is closed (pulled out). With the engine idling at 600–900 rpm, the air pressure must rise from 587 kPa (85 psi) to 690 kPa (100 psi) within two minutes.