[Rui]

are u talkin about the brake master cylinder? if u are i have a lil bit of idea on what its like since its basically bout the same for my car as ur car.... if there are u lines on the left side of the master cylinder take those off but try not to screw up the nut for them its goin to be a pain for it if it has never been replaced then unbolt the master cylinder from that big black thing (forgot what its called) there should be 3 bolts on that one (or nuts cant remember at the time) and just pull the assembly apart order the new part and just bolt on what u took off.... after all of that u might have to bleed the brakes (this is my way of doing it there is another but i forgot how to do it that way) oh and this is for a car with no abs..... if u got abs... sorry cant help u.....