What is the biggest brakes I can go on my fabia vrs mk1 1.9 tdi would like brembo??

8pot K-Sport

Sorry was meant to add in there standard wheels :/

If you mean disc size, then 312mm dia is a common upgrade (standard are 288mm). I'm not sure if you can fit even larger ones with standard wheels.

Some people even put larger (and vented) discs on the rear too, however most people point out that fronts do most of the braking anyway so it's pritty pointless upgrading rears.

do the octavia vrs rears have the same faults as the fabia ?

What calipers can I have will lcr brembos fit?

LCR Brembos wont fit behind standard 16's. Unless youre seeking big power 312's are plenty.