What is the standard pressure range for the main reservoir?

What is the standard pressure range for the main reservoir?

• A. 120-140 psi
• B. 90-110 psi
• C. 150-170 psi
• D. 100-120 psi

Answer: (A)

The main idea here is how compressed-air systems keep their working air ready. The main reservoir stores compressed air and is kept at a specific range by the compressor governor so there’s enough pressure to operate the brakes reliably without stressing the system. 120-140 psi is the typical operating range for that reservoir. It provides sufficient air for multiple brake applications and quick actuation, while staying within normal component ratings. Being below that range can lead to insufficient braking power, and going above it isn’t usually necessary and can risk wear or overpressure. That’s why 120-140 psi is the best fit.

The main idea here is how compressed-air systems keep their working air ready. The main reservoir stores compressed air and is kept at a specific range by the compressor governor so there’s enough pressure to operate the brakes reliably without stressing the system.

120-140 psi is the typical operating range for that reservoir. It provides sufficient air for multiple brake applications and quick actuation, while staying within normal component ratings. Being below that range can lead to insufficient braking power, and going above it isn’t usually necessary and can risk wear or overpressure.

That’s why 120-140 psi is the best fit.