What is the acceptable range for the air pressure gauge?

An air pressure gauge in a commercial vehicle is crucial for ensuring that the air brake system functions properly. The acceptable range for air pressure in a truck or bus typically stops moving in the proper range around 120 PSI. This range indicates that the air braking system has sufficient pressure to operate effectively.

At this pressure level, the brakes can engage and release properly, ensuring safe stopping power and overall vehicle control. If the air pressure drops below this threshold, the braking system may not work as intended, leading to potential safety hazards.

Maintaining the gauge within this range is essential for safe operation, as anything significantly lower can indicate a problem within the air system, such as leaks or compressor issues that could result in brake failure. Therefore, 120 PSI represents the acceptable standard that drivers and mechanics look for during a pre-trip inspection.