Hi good day gents ... I'm looking for someone that specializes in the braking system of the E46, I have a 318ti, my brakes doesn't hold the pressure and the pedal becomes hard , I've replaced the booster about three times , replaced the vacuum pump and now I've been told it's the master cylinder , had the car by two different workshops and at value brake and clutch and no one can give me a definite of what I need to replace or fix , all three places giving me three different answers ... if there's anyone that could help or point me in the right direction would really appreciate it guys ...