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Message: <blockquote data-quote="Jack Hidley" data-source="post: 1357950" data-attributes="member: 21070">Cpotts,I guess I wasn't completely clear. Vintage Venom is  essentially out of business. They have zero inventory left and will not  be manufacturing any more products. I am 100% sure about this.My  point about the caliper piston areas is that it is incorrect to count  both sides of the caliper. This will lead people to make incorrect  caliper choices. As an example, you currently show that the 1994-98 Mustang Cobra front calipers have a piston area of 7in^2 and that the 2000 Mustang Cobra R front calipers have a piston area of 14in^2. Since the Cobra R calipers appear to have twice the piston area, at the same brake line pressure, they should have double the clamping force and therefore double the brake torque, but they don't. They have exactly the same brake torque as each other. The reason is that sliding calipers (ones with pistons on only one side), have virtual piston(s) on the opposite side of the caliper. When the hydraulic pressure pushes on the real pistons, it also pushes on the inside of the caliper in the opposite direction. (In a hydraulic chamber, the pressure everywhere is constant.) This force pushes the caliper away from the pistons. This is the same thing as the pads on the opposite side of the caliper being pushed onto the brake rotor. This is where the virtual pistons come from.If you did have a caliper with pistons on one side that was fixed, the brake pad on that side would create friction, but the pad on the opposite side would not, since it can't move. As a result you would have 1/2 of the normal brake torque for a sliding caliper with this configuration.BTW, here are some piston information for some of the missing calipers in the thread. Baer 6P 31mm, 35mm and 41mm2007-12 GT500 40mm 44mm2013-14 GT500 30mm 34mm 38mm  I'm 90% sure that the F14 kit uses 40mm and 44mm pistons.</blockquote>