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Each compressor cycle relies on the Mack Air Brake Governor to keep reservoir pressure inside its designed operating range. It signals the compressor to unload once pressure reaches the cut-out setting, then calls for compression again after pressure drops to the cut-in point. Threading the governor into the compressor's existing port lets the surrounding air lines remain in place. Replacing the Mack 85152913 restores normal pressure cycling when the old governor is stuck or drifting.
| Brand | Part Number |
|---|---|
| WABCO | 4008500632 |
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