What pressure range does the Main Reservoir maintain?

What pressure range does the Main Reservoir maintain?

• A. 100 to 120 PSI
• B. 120 to 140 PSI
• C. 140 to 160 PSI
• D. 80 to 100 PSI

Answer: (B)

In an air brake system, the main reservoir is charged by the compressor and regulated by a governor to stay within a specific pressure band. The compressor fills the reservoir until the governor reaches its upper limit and stops; when pressure falls to the lower limit, the governor starts the compressor again. This keeps the reservoir pressure high enough to release and apply brakes reliably, but not so high that it wastes energy or stresses components. The main reservoir is typically maintained in the range of 120 to 140 psi. This band provides a ready supply for brake operations while protecting parts from over-pressurization. (Exact numbers can vary by system, but the principle of a two-point governor control remains the same.)

In an air brake system, the main reservoir is charged by the compressor and regulated by a governor to stay within a specific pressure band. The compressor fills the reservoir until the governor reaches its upper limit and stops; when pressure falls to the lower limit, the governor starts the compressor again. This keeps the reservoir pressure high enough to release and apply brakes reliably, but not so high that it wastes energy or stresses components.

The main reservoir is typically maintained in the range of 120 to 140 psi. This band provides a ready supply for brake operations while protecting parts from over-pressurization. (Exact numbers can vary by system, but the principle of a two-point governor control remains the same.)