The low air pressure warning light must come on before the pressure drops below:

60 psi.. Section 5.1: The low air pressure warning signal must come on before the pressure falls below 60 psi.

The low air pressure warning light must come on before the pressure drops below:

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