Front brake issues R100GS/PD

Discussion in 'Airheads' started by seez0916, Dec 27, 2012.

  1. seez0916

    seez0916 n00b

    Joined:
    May 19, 2011
    Oddometer:
    2
    Location:
    Brisbane QLD
    :eek1 Help, the front brake on my '95 R100GS/PD is locking on? Trying to bleed it but it is still locking the front wheel up. Ideas?
    #1
  2. hoss18

    hoss18 Been here awhile

    Joined:
    Sep 24, 2009
    Oddometer:
    123
    Location:
    Perth WA
    Been wet / salt? - Corrosion on pistons or pin.
    How old is brake line? - possible is crap inside line blocking master cylinder / line / piston
    #2
  3. camgregus

    camgregus riding gently now

    Joined:
    Feb 24, 2006
    Oddometer:
    3,023
    Location:
    on the banks of the mighty mississippi, AR side
    caliper needs cleaned/rebuilt?
    #3
  4. Big Bamboo

    Big Bamboo Aircooled & Sunbaked

    Joined:
    Sep 29, 2010
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    8,272
    Location:
    Big Island of Hawaii
    Sounds like the return port on your master cylinder is plugged. Pull the cap off and look down at the bottom of the reservoir. You should see two tiny holes into the bore of the master cylinder. Use a toothpick or similar to clean them both.
    #4
  5. supershaft

    supershaft because I can

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    That's my guess too. I have seen a rash of troubles caused in the last few years from the rubber hoses coming apart on the inside. Especially on oilheads for some reason but still . . . .
    #5
  6. seez0916

    seez0916 n00b

    Joined:
    May 19, 2011
    Oddometer:
    2
    Location:
    Brisbane QLD
    Thanks guys, the little holes in the master cyclinder were clogged and the brake lines are also crumbling. Tried to get a new master cyclinder but none available in Oz at the moment so rebuilt it. Will order new lines and a caliper kit and it should be all good. Thanks for the help.
    #6
  7. dm635

    dm635 I Roll

    Joined:
    Sep 15, 2012
    Oddometer:
    382
    Location:
    Louisville Ky-actually 30 miles east
    Agree on that. Been driving old bimmers since around '95 & there's been many a brake problem fixed by replacing the rubber lines. They can even fail by acting as a one way valve holding pressure & not releasing.
    #7
  8. supershaft

    supershaft because I can

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    Sep 9, 2010
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    9,116
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    San Francisco Bay area
    +1
    #8
  9. hoss18

    hoss18 Been here awhile

    Joined:
    Sep 24, 2009
    Oddometer:
    123
    Location:
    Perth WA
    Yes the rubber hoses do eventually fail on the inside - but lets be realistic - in many cases 20+ years from a rubber hose is not bad. BMW does recommend their replacement at 10yrs.
    #9