28146 Electric Brake Vacuum Pump Switch Brake Vacuum Switch For Brake Booster Vacuum Pump Kit Electric Vacuum Pump 100% tested PERFECT FIT - 28146 Vacuum Pump Switch fit for electric vacuum pump for power brakes, Many customers also like to use it for AC Delco (Hella) vacuum pump WORKING VACUUM RANGE - on at 16" of vacuum or less, turns off at 25-29" of vacuum based on the type of pump. PRESSURE SWITCH AUTOMATIC ADJUSTMENT - on at 16" of vacuum or less, turns off at 25-29" of vacuum based on the type of pump. 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.
