[DanEC]

That sounds odd but I don't know what Jag used for front brake calipers.

Another way of looking at it is - since typically your front brakes provide over 50% of the braking effort, the pistons in the calipers are larger in the front than on the rear calipers. In order to maintain reasonable pedal effort and uniform line pressures in the two hydraulic systems for even braking, a larger diameter master cylinder would be used on the front system to match the larger pistons.

Using a large diameter master cylinder with smaller rear brake calipers and a smaller diameter master cylinder with the larger front brake calipers would no doubt provide a very interesting stopping system. Rear wheel lockup and high pedal effort would seem to be certain.

But again, I don't know what Jag did with their front brakes so maybe I'm missing something.