What is typically the minimum air pressure requirement for safe operation of air brakes?

The minimum air pressure requirement for the safe operation of air brakes is generally 90 psi. This threshold is established to ensure that the braking system operates effectively, allowing for proper modulation of brake force and safe vehicle operation. When the air pressure falls below this level, the reliability of the air brakes can diminish significantly, potentially leading to brake failure or inadequate braking force.

Air brakes operate using compressed air to apply force to the braking system. If the pressure is too low, the brakes may not engage fully or may engage too slowly, which could increase stopping distances or cause loss of control. Therefore, maintaining the air pressure above the 90 psi mark is crucial for the safety of the vehicle and its occupants, as well as for the overall effectiveness of the air brake system.