Hey guys im installing a vf420 kit and ive noticed a lot of diys where they are installing a check valve on there brake booster sensor. When i read the vf install guide it says to cut and solenoid the senor by placing the cap provided? Could anybody clear it up for me because i thought this required a vacuum at all time. Pictures would be nice. btw my car is an 03 M3, if that helps.
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