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Thread: Question on the power brake regulator

  1. #1
    Join Date
    Sep 2010
    Location
    Hagerstown,MD
    Posts
    1,027
    My Cars
    1984 Euro 635

    Question on the brake pressure regulator

    Ok. So I'm in deep. Brake master cylinder took a dump. Power brake booster leaking. Clutch master cylinder leaking and power steering pump leaking...

    I have sourced a new brake master cylinder, nitrous ball, stainless brake lines, power booster rebuild kit, remaned power steering pump, clutch master and slave, stainless clutch hose AND all the hoses going to and from the aformentioned.

    Only item in the mix not getting any attention is the brake pressure regulator I know there a test procedure in the Bentley manual. Other than that, is there a way to clean the internals (like a flush?) Don't want to damage the damn thing cause it's spendy. Thanks

    George
    Last edited by EuroGeorge; 05-18-2019 at 09:10 PM.
    '84 Euro 635
    '88 M6 (Gone but not forgotten)

  2. #2
    Join Date
    Feb 2009
    Location
    Pittsburgh, PA
    Posts
    1,718
    My Cars
    '86 635CSi, '08 128i
    IMHO I'd run it as-is. It'll self-purge once you've bolted it all together again. I might be tempted to replace the pressure switches since they always leak. That's the only problem I've ever had with those units. I'm sure you've run clean ATF in the system for years, it will be in good shape. ATF tends to preserve everything very well, and the lack of any air in the system keeps it that way.
    Save the manuals!
    '08 128i 6MT, '86 635CSi 5MT (B32, Motronic 1.3, WBO2, G265, 18# FW, 3.46 torsen)
    Past projects:
    '96 318iS, sold 4/23 '90 535iM, RIP 1/23 '90 535iA RIP 6/22 '91 318i, sold 7/19 '97 M3 sedan, sold 11/18 '85 735i, RIP 2/18 '92 325iC, sold 7/16 '91 318iS, sold 6/16 '84 745i, sold 10/14 '82 633CSi, traded 9/12 '90 325i, RIP '87 325 sold '89 525i, traded '87 325iS, RIP

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