15/16 or 1 1/32

junkyardhero said
if it's power you won't really notice much.

if it's manual with that set up i'd recommend the 15/16. it'll be firm but not overwhelmingly so. you can fine tune the pedal feel with different calipers and rear pistons (specific years have different diameters) and the master diameter if you're looking for a certain outcome.
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The pedal feel is actually firmer with 1 1/32” bore. The 15/16 has better clamping force but longer pedal travel which some equate to as being softer. I’ve run the 15/16 ona manual brake body and was happy with the results. K=just about to install another one in an A body.
just leave your rear brakes as 10”