Good Afternoon Guys –

I have an interesting brake question. I purchased a set of used Big Reds for the front of my car and new 993RS rear calipers. I purchased a rebuild kit for each piston in the Big Reds – 44mm and 36mm. The 44mm pistons fit without problem. The 36mm pistons were way too small for the cylinder bore. I measured the piston that came with the calipers (remember these were purchased used) and they measured 40mm. I have four (4) 40mm pistons and rebuild kits on order and will write back if they mate properly with the cylinder bore. I also measured the bore and sure enough they measure 40mm. I am unsure if the PO had these custom machined or ??? Anyone have an idea if this set up was available from Porsche? I appreciate the feedback and help in my search.

Sincerely,
Michael Bishop

 

should check over on rennlist if you never got an answer. Bill V. knows everything there is to know about these caliper options