Air Brake Manual


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Air governor

The governor (Fig. 20), which is usually compressor mounted, operates in conjunction with the compressor and maintains reservoir air pressure between a predetermined maximum and minimum pressure.

  • cut-out pressure 120 to 145 psi (828 to 1,000 kPa) maximum
  • cut-in pressure 100 psi (690 kPa) minimum

The governor will normally cut in 20-25 psi below the cut-out pressure.

Air governor
Figure 20. Air governor

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Rev: 2018