Hmmm does not really make sense to me. Sandeep told me though that there are differences though in calipers that are mounted either in the front or in the back of the spindle. The smaller piston is supposed to be the first one in the driving direction which means that if you have a back mounted caliper it should be the bottom one. All the 993TT calipers have a mounting arrow on them. Not sure about the others.
Alex
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