What is the primary purpose of an air pressure gauge in a commercial vehicle?

The primary purpose of an air pressure gauge in a commercial vehicle is to ensure that the air brake pressure is adequate. Air brakes are common in large vehicles due to their effectiveness and reliability. The air pressure gauge provides crucial information about the amount of compressed air available in the brake system, which is essential for safe braking operations. If the air pressure falls below a certain threshold, it can lead to brake failure, making it vital for drivers to continuously monitor this gauge to maintain proper brake function and ensure safety on the road.

By keeping an eye on the air pressure gauge, drivers can take necessary actions if the pressure is low, such as checking for leaks or ensuring the air compressor is functioning properly, thereby preventing potential accidents and ensuring the vehicle's braking system operates efficiently.