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  1. #41
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    I was an ASE Certified Master mechanic...

    I saw alot of this stuff. Air in the system will cause a soft pedal all the time, not just on the first push. IMO you have a M/C going bad.Fritracer
    Cincinnati, OH
    2000 540ia Sport Package 9/99 Silver/ Black
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  2. #42
    Craig in Canada
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    Some bleeding info from DaveZ

    I know that DaveZ is still well respected around here as a "brake guy". I happened to be googling a number of topics and came across a couple of places where even DaveZ himself echos the same things I had read about power bleeding alone not getting the job done as well as the old-fashioned method.


    Assuming censorship doesn't botch the URLs:

    http://www.m5board.com/vbulletin/e39...tml#post173994

    http://www.bmwtips.com/tipsntricks/b...ol/bleeder.htm


    I think I'll still look into a power bleeder for convenience and to reduce the time taken by the operation, but some portion of the old way will still be in the procedure. I may also look at replacing the MC if lots of winter ABS action and a spring time bleed don't have things working like I would like. It's $300 and a huge PITA I'd like to avoid though.

  3. #43
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    I've often thought about doing something like this

    But instead of having someone step on the brake I'd use my pressure bleeder and then connect a vacuum source to the bleeder nipple.
    Actually I could open the nipple and then step on the brake.
    Maybe I'll give this a try this winter.

  4. #44
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    excellent thread

    So i left my system open for a week with brake calipers removed and I forgot to pour fluid back into reservoir


    When i came back after a week main reservoir was empty
    ( I know my bad , but i am doing it for the first time )

    Now i installed new rotors, pads, rebuild calipers and bled the system with compressor under 15 psi ( CNN method )
    All went smooth , no air bubbles but my pedal is soft and i have excessive brake pedal travel

    I believe that is because reservoir was empty and i probably got air into the system

    Tomorrow i will try to re-bleed my system +ABS with help of BMW software ( DIS )

    Wish me GL and thanks for any help ;)
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  5. #45
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    You have air in your master cylinder. You will not get that out easily with it on the car. It will most probably need to be bench bled and then re-installed with caps on the outlets to retain fluid and then pressure bleed the entire system.

    2000 540ia w/sport package 9/99
    Silver/black, Eibach springs and Koni FSD equiped
    1998 528i 5 spd w/sport package
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    1987 535is
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    (stroked to 420cid, 5 spd Tremec TKO 500)
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