You should be measuring the thickness of the disc where the pads rub it.
This is not quite as easy as it should be, because the pads don't rub right
to the edge, so you end up with a thicker lip around the outside (after many
years wear) that makes measuring more difficult.
The best way to do this would be with a screw micrometer - a device a bit
like a C-clamp that tells you the distance across its gap by how many turns
you have turned it (to an accuracy of 1/100 mm - more than we really care
about!). Most people don't have one of these hanging around their workshop!
You could use a Vernier gauge (kind of like a slide rule with jaws attached
to the main bit and the sliding bit, and tells you the distance between the
jaws to 1/10 mm), but you would need a couple of small blocks to put either
side of the disc. Then you could measure the distance across the blocks,
and then subtract the block thicknesses - do this to get over the thick-lip
problem.
Without a Vernier gauge (which should be quite cheap from a tool supplier) I
can't think how you could measure your discs with enough accuracy to make it
worth doing.
Richard & Daffy
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