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This is how it was explained to me. Drum brakes and single pot calipers require more fluid to move the pads until they contact the rotor or drum. The larger 21mm 944 unit usually came with a vacuum servo. The reason is that the larger diameter MC has less mechanical advantage. In other words if you use it without the booster the petal is harder to push for a shorter distance to get the same braking response. 2, 4, 6 pot calipers require less fluid movement to achive contact with the rotor so they work best with a smaller MC which has a higher mechanical advantage. Less petal pressure, but more travel to get the same braking force. In some disk drum race cars, they use dual MCs matched to the front and rear systems with an adjustable balance bar to adjust brake bias. I will be using Wilwood 4 pot calipers on all four wheels. Until I identify a problem I am staying with the dual circuit Bug MC. While looking for some thing else, I ran across a 21mm MC for a 944 without the brake booster. It may come on the turbo model as it has four pot calipers all around I think.
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