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The front brakes will be 4 piston and the rear is shown as a single piston. A bug requires near to a 50/50 brake bias. That is to say that the braking power should be about the same front and rear because of the heavy rear weight bias transfers forward under braking. On a front engined car with a weight bias of 55% front and 45% rear the brake bias will be around 75% front and 25% rear to take care of the weight transfer under braking.
The way to calculate your current bias is to compare the total front caliper piston area/front master cylinder piston area with the total rear caliper piston area/rear master piston area. Also, the brake disc diameters will moderate the final figures but I am assuming that the front and rear discs are about the same diameter?
You say that the master cylinder is larger - why? The smaller the master cylinder the more power you can apply to the brakes as the hydraulic advantage = total caliper piston area/master piston area. The downside of the smaller master piston is the longer pedal travel but generally this is minimal on a well set system. The bug 19/19 master cylinder is usually big enough for almost all applications and it will be only where massive caliper piston areas are used will you need a larger master cylinder to compensate.
Clive
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