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Thread: Installed used brake master cylinder and fluid not bleeding out!

  1. #1
    Join Date
    Oct 2006
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    South Jersey
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    84 318i

    Installed used brake master cylinder and fluid not bleeding out!

    I installed a used master cylinder on my 86 325es and when I went to bleed the brakes fluid is only coming out of the driver's side rear caliper! If the master cylinder is bad would it cause this? Or is it just a large air pocket possibly? I am using a vacuum bleeding and had a friend also pump the brakes!

  2. #2
    Join Date
    Sep 2014
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    e24e30e36e39e90
    Are you sure the bleeder valves aren’t clogged?

  3. #3
    Join Date
    Oct 2006
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    South Jersey
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    84 318i
    I will check that when I get home, good idea. They put some much road salt around here in the winter time. If a master cylinder is bad would it cause the system not to bleed even with a vacuum pump?

  4. #4
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    Sep 2014
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    I had a clogged one on my e36, stick a wire through or unscrew it completely.

  5. #5
    Join Date
    Jul 2013
    Location
    CT
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    1989 325i 4 Door 5sp
    Did you bench bleed the replacement master cylinder? Look up the procedure.

  6. #6
    Join Date
    Oct 2006
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    South Jersey
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    84 318i
    I didn't bench bleed it. I cleaned the bleeder valves and fluid is coming out now. I noticed my fluid reservoir is not all the way in the master cylinder where it meets the rubber bushings. When I try pushing it down it won't go all the way in the rubber bushings. I bought new rubber bushings.

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