I got some FRS Brembos and i do need to change the knuckle because they're stronger and easier to mess with, when it comes to make the bracket for the Brembos.

My one and only problem was really with the spindle of the driveshaft (think it's the correct way to say it...) would fit the ST170 hub, because my box is an IB5 and don't know if it really as something to do with it.

Thanks for the replies. I think the brake cylinder has to be upgraded too, but not the servo....