Air Warning Devices Test

  • Leave engine off
  • Slowly press and release service brake
  • Continue until warning devices activate
  • Warnings should activate before pressure drops to 55 psi

“Next I will test the low pressure warning devices. This is done by pressing and releasing the Service Brake, fanning off air pressure. The warning devices, in this case an alarm and red light on the gauges, must activate before the pressure drops to 55 psi.