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Thread: verify pls a REAR CALIPER ~circa 78 R100

  1. #1

    verify pls a REAR CALIPER ~circa 78 R100

    Will somebody pls describe their rear disc R bike caliper ? Where are your bleed ports ?


    I cant hang the caliper just yet to look at the position of the ports, and its been too many moons apart to recall,

    but this caliper that came off my '78 r100 had both ports ( hose & bleed) on one end

    while the MAX diagram shows the similar body casting but a version with a pad on the puck cavity drilled for bleed hole ....

    I figured this caliper that came with bike was original but I didnt get to pick it from the litter in the showroom either..


    Seems easy enough to bleed the "original" caliper even if hanging free from the disc ( thus should be able to get the bleed port upper most) but would like to know.

    The both-ports-same-end style is available under as a Ducati part for what I'd call "not outrageously expensive " ($120) for a NIB.

    thanks for reply !

    bmw r100s rear caliper - 1.jpeg
    Last edited by gtgt_bangbang; 09-23-2022 at 11:20 PM.

  2. #2
    Registered User melville's Avatar
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    Quote Originally Posted by gtgt_bangbang View Post
    Will somebody pls describe their rear disc R bike caliper ? Where are your bleed ports ?


    I cant hang the caliper just yet to look at the position of the ports, and its been too many moons apart to recall,

    but this caliper that came off my '78 r100 had both ports ( hose & bleed) on one end

    while the MAX diagram shows the similar body casting but a version with a pad on the puck cavity drilled for bleed hole ....

    I figured this caliper that came with bike was original but I didnt get to pick it from the litter in the showroom either..


    Seems easy enough to bleed the "original" caliper even if hanging free from the disc ( thus should be able to get the bleed port upper most) but would like to know.

    The both-ports-same-end style is available under as a Ducati part for what I'd call "not outrageously expensive " ($120) for a NIB.

    thanks for reply !

    bmw r100s rear caliper - 1.jpeg
    Here's what I just pulled off my 1979 RS:



    I hadn't noticed the date code on the hose before!!!!

    My guess is that bleeding will go better if you do it before you mount it so you can move it around until the bleed port is the high point of the caliper. Otherwise I can see air just staying in the bores above the bleed port.

  3. #3
    Quote Originally Posted by melville View Post
    Here's what I just pulled off my 1979 RS:

    bleeding will go better if you do it before you mount.
    yep, thanks

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