6 bleed nipples on servo

Discussion in 'The Garage' started by guzzimark, Jul 24, 2011.

  1. guzzimark

    guzzimark Adventurer

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    I changed the brake fluid yesterday on my 2004 r1150gs using a link from this site. Everything went fine, but i was wondering what the 6 bleed nipple were for on top of the servo unit under the tank, just for future refence. Anybody out there know????
    #1
  2. Anorak

    Anorak Woolf Barnato

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    They're for bleeding the front and rear control circuits. The master cylinders on the handlebar and foot brake. So, yes there are four brake circuits for two brakes.
    #2
  3. tbarstow

    tbarstow Two-wheelin' Fool

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    There are 6 circuits, you missed two of them on the servo. Each one goes like this: master cylinder to servo, servo to servo, then servo to caliper.

    http://www.advrider.com/forums/showthread.php?t=455142

    Flushing and bleeding the middle circuit for both the front and rear circuits keeps your servo from dying.
    #3
  4. Anorak

    Anorak Woolf Barnato

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    Yes, the source of the fluid that issues forth from those six bleed nipples are the front and rear brake master cylinder reservoirs. BMW calls that the control circuit. They call the circuit that leads to the caliper the wheel circuit.
    #4
  5. guzzimark

    guzzimark Adventurer

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    Excellent replies, looks like i'll be re-doing this weekend.. Thanks again guys....
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  6. JimVonBaden

    JimVonBaden "Cool" Aid!

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    From my web site:

    [​IMG]

    NOTE: There was a change in the need to bleed all the ABS controller fitting in a BMW service bulletin. Specifically in Bulletin # 34 002 06 (019) dated Apr 2006

    Maintenance:
    For maintenance work, the brake fluid replacement in the control circuits is now only to be carried out via the control circuit bleeding ports (see arrows in pictures). It is no longer required to replace the fluid via the bleeding ports of the metering cylinder and of the Integral circuit during routine brake fluid replacement.


    Jim :brow
    #6
  7. mcstark

    mcstark Living brappy...

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    That should be added to the GS Maintenance manual...of course, it's probably already on your DVD's, right Jim? :ear
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  8. JimVonBaden

    JimVonBaden "Cool" Aid!

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    It is.

    Jim :brow
    #8