Reply to "Brake question...."

Turbo, trying to calculate this stuff is full of possibilities for error. Assuming you want to modify your brakes, here's a real-world baseline: I run vented rotors the same dia & thickness as stock solid rotors, Wilwood Superlite 2s in front with Porsche 911S (front calipers) in the rear, stock pedal lengths and a late GM power brake assembly with stepped master cylinder bores as converted for the Pantera by Precision Pro-formance. The car uses no shuttle valve, aeroquip lines and a manual Kelsey-Hayes proportioning valve, all plumbed to generate adjustable pressure in back with full pressure in front (stock plumbing is exactly backwards of this). To get a verifyable adjustment, I added small liquid filled 0-2000psi gauges permanently mounted on the brake lines. The combination is adjusted for about 1100 psi on the fronts and 950 on the rears with the engine at idle, using firm but not panic-stop foot pressure. This gives a nice pedal feel with outstanding stability under heavy braking, without over-braking the fronts in the rain. Mid-engined MR-2s use a temporary plug-in gauge set that screws into a front and rear bleeder screw to verify the balance of their non-adjustable proportioning valve settings, and they're pretty close in pressure to what I found to work well with our Pantera's assembly. This should give you a starting point without wearing out your calculator.