CQ Brake upgrade?

[Gaz]

I want to improve the brakes on the CQ.

I'm not really up on braking systems, so I don't know much about there components tbh.

I'm guessing a 280mm upgrade on the front is the way forward. Is there also an upgrade option for the rears too? like maybe using the discarded 256mm brakes from the front? or is this not possible?

Also, I have some requirements, if possible.
Firstly, I wish to retain the 4x108 stud pattern.
Secondly, I want to keep the ABS.
& Thirdly, I'd like to throw some Black Diamond Disc's and pads in to the mix.

please tell me all this is possible.

(sorry if this has already been covered)

Gaz.