I have 355mm stoptech rotors and 6 piston calipers. Is it possible to use rotora's 380mm rotors with these stoptech calipers with some bigger braket ?

 

Aside from the bracket to space the rotor out further, you have to make sure that the height of the pad is not larger than the face of the rotor that it is contacting. There's also the thickness issue. If the rotor is too thick, the pads won't fit when new. If the rotor is too thin, you have the threat of the pistons falling out when the pad wears down.

So if you happen to get it to fit correctly, you'll have to deal with the change in brake torque from the larger rotor which will throw off the brake bias, and lengthen your stopping distance.

If you are trying to place a 380 6 piston kit on a 370Z, We have a 380mm kit for that car. Usually the most cost effective way to is to sell your old kit, and use that money towards a new kit. Then you'll have a new system that is specifically designed for that vehicle.

 

Stoptech while your here ive got a question about my rear kit. Is it really a st-40 or st-45 caliper? Its the 4 piston, 355mm kit for the rear.

 

Our rear 370z kit is a St-45 on a 355mm.