important to solve, first must know how the swicth vacum works, is it sensor works when lack of pressure or works when car after use..... my volvo problem is the swicth sensor vacum , motor works fine. after using positive from brakelight , everytime you push brake pedal, the motor will run. but you...

been try this method for 2 days, yes it work at morning or cool engines start, and can brake well..... but problem came up.... it sound when push pedal brake..... ha...ha....ha........... next step finding same relay that will delay on for 5 minutes to cut the power of light brake after ignition on....

i bought for two time volvo s40, in 2011 first car was fine...but sold ,then 2014 nov just bought another s40 with in not good condition, i have same problem with brake (very hard push) when in the morning or left for more than 5 hour's. the problem came in the swicth valve vacuum brake controler, w...