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>From: parkkj@orion.crd.ge.com (Keith Park) >Tim has given the important data... the disc system needs a much larger bore master as the calipers displace much more fluid than wheel cylinders. > >This is also true for the late disc systems as opposed to the early ones, >the late ones need a larger master. While the idea you have expressed here is true, the facts are not quite so simple. All type IIIs used a 3/4" dia MC except for pre-66 squarebacks which were 13/16. All disk brake type IIIs used a 3/4" master cyl; all type IIIs have 42mm pistons in the calipers; the pads were larger in the late years, but the pistons are the same. (The rebuild kits are different only because they include different spreader springs, caliper bolts, and bolt locking plates.) Jim --------------------------------------------------------------------- Melissa Kepner Jim Adney jadney@vwtype3.org jadney@vwtype3.org Laura Kepner-Adney Madison, Wisconsin ---------------------------------------------------------------------