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Originally Posted by CSG Mike
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Actually the mc needs a diaphragm type seal under the cap otherwise the piston would create a partial vacuum every time you tried to apply the brakes. Make no mistake, water contamination of brake fluid remains a problem. Car makers and brake system makers all recommend routine and regular flushing of brake fluid for this reason.
As for the performance of "race pads" equalling that of street pads under all conditions I will defer to your racing experience. Whether race pads are better for a road car then street pads is the issue I am discussing. On that metric race or track pads are dangerous, in my opinion. Brake pad makers agree. The first time you rear end someone would prove my point. However, most drivers will be unaware that they do so because of their track biased brake setup.
Thanks for the link but an understanding of high school physics is sufficiently sophisticated to understand braking systems. "Impulse" is not a helpful concept. The cause of brake overheating is simply the delta between heat creation and dissipation. The resulting net quantity is absorbed by the rotors. Conduction eventually raises the temperature of the brake fluid above its boiling point. The pads will continue to brake the car as long as the driver is able to apply sufficient line pressure. Unlike a drum brake which fades to nothing regardless of mc piston stroke, lining material or driver strength. That is the fundamental difference between real brake fade, as is still experienced by heavy truck drivers, and disc brake "fade" which rarely occurs in reality. Just recently I observed a Red Bull F1 car with a dragging left front brake resulting from overheating of the brakes, the mechanic was using a dry ice cooled blower to free up the caliper. Thermal expansion assists the driver using disc brakes.