question

[smettie]

hello,

yesterday i received a scale model of a 360 modena 1:18. i was/am happy like a small child and have observed it already for a long time. i saw that at the rear tires, there are like 2 braking calipers. i checked it at some pics and saw that it also is like that in reality.
( http://img51.exs.cx/my.php?loc=img51...rari360062.jpg ) i can't immediately see the purpose of this second (grey) braking caliper. or is is something else?

should be nice to know what it is!

ps: the f430 also has this

thx