Here is some data of brake configurations often discussed and sometimes used on our ti's. The data includes the weight of the brake kit, calculated static bias on a 318ti/323ti and estimated stopping length for a selection of combinations.
The weight (or mass) includes the disc, caliper, carrier, pad, brake shield and bolts.
As is seen from Table 1, increased unsprung weight and stopping distances may be the result if the brake configuration is not carefully selected. E.g. as much as 19kg is the difference between the configuration I have and a commercial available alternative.
Tabe 1: Weight, bias and estimated stopping distances for some brake configurations
Disclaimer: Note that the equations and relationships used in this work represent approximations of the real braking system. The results are based on my current level of knowledge and may change without further notice.