PERFECT FIT - 28146 Vacuum Pump Switch fit for our electric vacuum pump for brakes,Many customers also like to use it for AC Delco (Hella) vacuum pump and 79 Corvette,etc. WORKING VACUUM RANGE - Our booster vacuum pump is designed to kick on when the vacuum falls below 0.04 MPa and kicks off around 0.06 MPa.This switch will turn the pump off or on at a preset amount of vacuum.It is a pressure automatic adjustment switch. VACUUM PUMP SWITCH FUNCTION - It keeps the pump from constantly running and preserves pump life.Switch controls vacuum pump on/off bu typically uses a pilot relay between the switch contact and the vacuum pump motor. PRESSURE SWITCH AUTOMATIC ADJUSTMENT - To prevent the screw from coming loose in transit, The adjustment screw of the switch has been glued with glue.This range is preset and cannot be adjusted.It will turn the pump off or on at a preset amount of vacuum. IMPORTANT TIPS - At the connection, be sure to tighten, otherwise there will be leakage, which will affect the use of the pump.After the correct installation,it works exactly as it s supposed to.If you have any questions, please contact us, we provide warranty. New Electric Brake Vacuum Pump Switch for Booster 28146SALES SALES SALES THE LOWEST PRICE IN THE HISTORY LOSE THE CHANCE, YOU WILL REGRET A WHOLE YEAR ONLY IN THIS WEEK Part Numbers:28146 Fit for 28146 Electric Brake Vacuum Pump Note: The link is only the switch , not contains other accessories. If you need the whole set 28146 vacuum pump, please contact with us We are factory ,so can bring lowest prices for you Exportedtomany countries,USA and Europe,can bring best quality for you