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Porterfield R4S are a *street only* pad - don't use them for track use! R4 is for track.
Bottom line is:
You are boiling the fluid. Brake system heat capacity isn't up to snuff, ie fluid old or not at a high enough boiling point, brake cooling, or sometimes (yet rarely) the braking system itself is not robust enough to handle the heat.
If you were my customer I'd say:
*Motul or ATE Blue
*Get as much cooling as possible
*Get some decent pads - Pagid or Performance Friction.
Many, many people absolutely hate Hawks and have had trouble with them. I will never recommend or carry them for this reason.
Changing to steel calipers will not cure your issue one bit.
My 2 cents based on 3 1/2 years of brake biz -
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- Craig 3.4L, SC heads, 964 cams, B&B headers, K27 HF ZC turbo, Ruf IC. WUR & RPM switch, IA fuel head, Zork, G50/50 5 speed. 438 RWHP / 413 RWTQ -
"930 is the wild slut you sleep with who tries to kill you every time you "get it on" - Quote by Gabe
Movie: 930 on the dyno
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