I bought a 2003 ST4S this year and was very surpised by the ineficiency of the rear brake. I changed 3 times the pads for Brembo parts. The only result is lot of noice, claws in the disc and nothing more. I understand that in single you can ask more from the front brakes, but when you host a passenger, this is not a solution, except if you look to make this last one pass above yourself... Is there any kit with 4-caliper, larger floatting disk, more serious master cylinder? Thank you for your input