Hi-res images of R100RS rear disc brake setup needed

[the quinner]

You need to make certain that 1)...your swingarm has the tab for the forward end of the support arm. and, 2)...that your frame has the tab to mount the master cylinder...the rest is just swapping parts. I'm reasonably certain your bike will have the necessary tabs...there is an early 80s R100 in my shop right now (with drum rear brake)...it has all the necessary tabs...photos to expalin:

Master cylinder mounted on its bracket:





Master cylinder mounting points on the frame...front tab on lower cross-member and right side muffler mount:



Master cylinder in place:



Tab on underside of swingarm:



Caliper mounting plate acts as a spacer between the shoulder of the axle and the rear wheel:



The support strut that prevents the caliper from rotating with the wheel:

[StephenB]

Perfect pictures. The m/c mount poses a question though: "front tab on lower cross-member and right side muffler mount". First picture: does the muffler mount has the weld nuts on the inside of the bracket ... or was that only in my dreams?

[the quinner]

Perfect pictures. The m/c mount poses a question though: "front tab on lower cross-member and right side muffler mount". First picture: does the muffler mount has the weld nuts on the inside of the bracket ... or was that only in my dreams?

Yes...the M/C bracket sandwiches between the muffler and the frame. IOW, the muffler mounting bolts will go 1) through the muffler tab...2) through the M/C bracket...and, 3) into the threads of those welded on nuts...

I can get better pictures today if that's not clear.

[StephenB]

No, that's clear, I though as much. I think I am all set. I confirmed the support strut bracket, but not yet the 2nd tab at cross-member.