The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below:

60 psi.. Section 5.1: A low air pressure warning signal is required on vehicles with air brakes. It must come on before the pressure falls

The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below:

ANSWER BREAKDOWN
  • A. Incorrect. "80 psi." is not correct. A low air pressure warning signal is required on vehicles with air brakes. It must come on before the pressure falls below 60 psi.
  • B. Correct. A low air pressure warning signal is required on vehicles with air brakes. It must come on before the pressure falls below 60 psi.
  • C. Incorrect. "40 psi." is not correct. A low air pressure warning signal is required on vehicles with air brakes. It must come on before the pressure falls below 60 psi.
  • D. Incorrect. "20 psi." is not correct. A low air pressure warning signal is required on vehicles with air brakes. It must come on before the pressure falls below 60 psi.