Could be a several issues. It sounds like it happened fairly quickly. You also didn't mention hearing a leak. Sounds like the compressor stopped building pressure. Could be a stuck reed valve. If it was cold out see if the compressor head is freezing up.
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Blown or disconnected boost hose.
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I WOULD SAY MASSIVE AIR LEAK SOMEWHERE, DO YOU KNOW HOW TO CONFIRM IF THE AIR COMPRESSOR IS BUILDING AIR? YOU CAN REMOVE THE DISCHARGE LINE AND SEE IF THERE IS AIR COMING OUT, AND DISCONNECT THE SIGNAL LINE TO COMPRESSOR SHOULD BE BLUE AIR LINE, THAT WILL MAKE THE COMPRESSOR RUNN ALL THE TIME, IF THE AIR COMPRESSOR IS NOT PUSHING AIR OUT THE DISCHARGE LINE WITH THE SIGNAL LINE DISCONNECTED THEN THE COMPRESSOR IS BAD.
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