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Comments about Cardone Vacuum Pump - Domestic:
just make sure you remove the fill screw located on the backside of pump to make sure there is oil inside the pump.be careful though because that screw also positions the cam inside the pump.count the threads.and use thread lock sealent when replacing screw
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Q:where does the line go on the top of the vacuum pump
A:It is just an air compressor with the inlet and outlet exchanged. It take vacuum from the inlet side of the compressor. The pressure side is just exhausted away. Inside the power brake booster, is a large diaphragm that is linked to the pushrod from the brake pedal, that also goes into the master cylinder. The variable valve setup(on top of the vacuum pump) controls the amount of "pull" that is put on this diaphragm. It senses the pressure you have applied to the brake pedal.