Tinker,
Your "diatribe" was on the mark.
Further to that; someone stated that calipers must be disassembled to
enable boring, sleeving, and reboring for the piston bores. With few
exceptions (that being the old "Dunlop" style calipers on Jags, etc), there
is no need to machine, hone, or go any further than cleaning well, by hand,
the caliper bores. Unlike wheel cylinders, the bores of a caliper do little
work and need not be polished or have a special finish. All of the sealing
is done by the caliper main seal and the polished piston. The seal stays
put in the bore groove, the piston moves and is wiped by the stationary
seal. In a wheel cylinder (or the afore-mentioned Dunlop calipers or in
master and slave cylinders), the seal moves with the piston sealing against
the bore. In these cases the condition of the piston is less important and
the bore is critical.
I wont say there is never any need to split calipers, but it needs to
be
done with the full knowledge of the inherent risks, not unlike rebuilding a
master cylinder or a wheel cylinder. For fear of litigation, most
"professionals" will recommend against it.
Peter C.
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