mushy brakes

[j930]

we just bought a 06 325i. the brakes were a bit mushy so i had a BMW mechanic replace the rear rotors and pads and he said the fronts were fine. also had all the fluid bled as i was figuring air in the lines. he said that he bled them for almost 2 hours and he thinks there is air in the abs and that BMW can open up the ABS and flush that as well. so 160.00 later i took it to BMW and they said its the master cylinder. i found a local BMW shop that has all the computers and had the master cylinder replaced. still same thing. now they are thinking its the actual abs system/computer and the rear brakes are not engaging. anyone have any experience like this.. we have done all the obvious and have not gotten anywhere. the car only has 106K on it and seems very solid but this brake thing is killing me.

[Dmitry at Pelican Parts]

Hey j930...really sorry to hear that you're going through this and have already spent some $$ to no fix. Hopefully I can help out a bit...I've included a link to our tech articles on the 3-Series brakes. Feel free to browse and see if anything is relevant and can help you further diagnose the issue. If you have anymore questions, feel free to post a Comment just underneath one of the articles and someone will get back to you with technical help. Best of luck!

BMW 3-Series Brakes Tech Articles - BMW 3-Series E90 (2006-2013) Technical Articles - Pelican Parts


-Dmitry

[gibby]

I just fixed a simliar problem on my 91 318is. I had installed a bad rebuilt master cylinder with an internal seal leak. Under light braking, the pedal would go to the floor...and I suspect the rear brakes weren't engaging.
If you had a rebuilt cylinder installed, it could be bad. When I replaced mine with a brand new one, everything went back to normal.