Thanks Ken, on researching a little further I discovered that the residual valve is needed in all applications if you want to keep the pads or shoes tight against the disc/drum for a solid pedal feel. As you pointed out, the 10lbers are for drums (more effort needed on drums) and the 2lbers are for discs.
I've still gotta research which M/C will be best for me to use on my 4 whl disc conversion. Thinkin' maybe a 944 unit, seems to be what several others are using.
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