I find that very strange regarding the brakes i ve spoke to quite a few 200 owners who have tracked their car and taken it to the ring and have had no issues. I must admit my fluid did boil on the last afternoon I was at ring but wasnt a massive issue in the wee twingo. Might just be the brake fluid. For the twingo there are only 3 heavy braking points at the ring, mainly with it being light you can just lift off instead of braking.