At what psi should the air compressor stop pumping?

At what psi should the air compressor stop pumping?

• A. 120 psi
• B. 125 psi
• C. 130 psi
• D. 140 psi

Answer: (B)

Air brake systems are governed by a device that turns the compressor on and off to keep the system within safe pressure limits. The compressor stops pumping when the system reaches the cut-out pressure, which is typically about 125 psi. This stopping point prevents over-pressurizing the tanks while still leaving enough pressure to operate the brakes effectively. When the pressure drops to around 100 psi, the governor allows the compressor to start again. So, 125 psi is the standard stop-pumping pressure. The other values are outside the usual cut-out setting used in standard CDL systems.

Air brake systems are governed by a device that turns the compressor on and off to keep the system within safe pressure limits. The compressor stops pumping when the system reaches the cut-out pressure, which is typically about 125 psi. This stopping point prevents over-pressurizing the tanks while still leaving enough pressure to operate the brakes effectively. When the pressure drops to around 100 psi, the governor allows the compressor to start again. So, 125 psi is the standard stop-pumping pressure. The other values are outside the usual cut-out setting used in standard CDL systems.