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Thread: 78 100/7 master cylinder help

  1. #1
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    78 100/7 master cylinder help

    1978 100/7 front brake master cylinder cable adjustment. My Clymer manual instructs to have 0.010 clearance between the lever and the piston and to adjust the nut and adjuster to achieve this. What about the rod that is between the lever and piston? Also, the adjuster on my bike has zero thread on it and no nut. I take it that I need to replace this adjuster and nut? I am performing this task as I installed a new piston repair kit. Thanks.

  2. #2
    Liaison 20774's Avatar
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    The small rod should be in placed when making the adjustment as I remember. Here's a couple of past threads that are generally about the master cylinder:

    http://forums.bmwmoa.org/showthread....rake-free-play
    http://forums.bmwmoa.org/showthread....gauge-question

    Probably should spend some time and read this page:

    http://bmwmotorcycletech.info/brakes.htm

    On that page, there's a link to one of our member's rebuild of a /7 master cylinder:

    http://s428.photobucket.com/user/gru...?sort=2&page=1

    and another member's rebuild:

    http://brook.reams.me/bmw-motorcyle-...-disk-caliper/

    Hopefully there's an answer in there somewhere!!
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  3. #3
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    Thanks for the links. I've read them and have my answers. awesome

  4. #4
    Registered User AntonLargiader's Avatar
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    There are no threads at the hand lever because you don't adjust there. It's actually dangerous to do so on that model.

    Adjust the cable at the MC to get the correct piston protrusion.
    Anton Largiader 72724
    Tech articles - YouTube
    Virginia Motorrad Werkstatt BMW motorcycle service and repair in central Virginia

  5. #5
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    I am a rookie, read idiot. I did not realize the cable is reversible. I had the threaded adjuster up at the lever. Thank you Anton
    Last edited by 79woodsie; 10-03-2016 at 12:58 AM. Reason: discovered error in assembly

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