I fitted 278mm x 10mm discs with standard pads and caliper with 38mm piston to the rear of my 1987 b2 coupe GT and only had them on for one track day, on the slowest bend on the track braking from 75mph in third to 35mph in second I found myself facing the wrong way more than once due to rear wheel lock up, yes the car did not have ABS and did have the load leveling valve on the rear beam. I think fitting 269mm x 20mm discs and calipers with 43mm pistons may prove to have the same problem under heavy braking.
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