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Most of the aftermarket brake companies, be it Wilwood, AP Racing, or whatever manufacture calipers intended for front wheel applications, and others for rear wheel applications. The rear oriented calipers will have smaller overall piston area to give you a default "bias" that is in the ballpark for most cars. The bias is fine tuned/corrected with either dual master cylinders and a balance bar, or with an adjustable proportioning valve. Each method has strengths and weaknesses. In general racing/track cars would be best served by a balance bar, and street cars with an adjustable proportioning valve. The relevant data are combined (assuming multiple piston calipers) piston size for each front caliper, combined piston size for each rear caliper, brake disc diameter front/rear, and tire diameter. With this information, companies like Tilton Engineering can make sound recommendations for front/rear master cylinder sizes. None of this is rocket science, but there is a lot of data and arithmetic involved in sizing everything correctly. I agree with the prior post that many brake "upgrades" are actually not always true performance upgrades. People get away with just bolting on huge discs and 4-piston calipers on the front brakes only, because generally such a mod just dramatically increases front brake bias. Front brake bias is "safe" (it won't cause the car to spin), but many of these aftermarket front brake upgrades will actually increase stopping distance from stock. To do it right, brakes need to be a system involving front/rear, master cylinders, and proportioning systems. If this is done correctly, you can dramatically improve on the stock brakes in terms of weight, "feel", stopping distance, and fade resistance.