help my brakes

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did some adjusting and cleaning on my 06 avanlanche 2.0 disk and the brakes just arent enough.
does anyone know if its worth goin to a 203mm disk?
where can i get an adapter from in sydney?
i dont want to go hydraulic an im lookin at gettin the avids up front, do the avids work with the shimano v-brake levers i have?
help!!!!!!!!!

did some adjusting and cleaning on my 06 avanlanche 2.0 disk and the brakes just arent enough.
does anyone know if its worth goin to a 203mm disk?
where can i get an adapter from in sydney?
i dont want to go hydraulic an im lookin at gettin the avids up front, do the avids work with the shimano v-brake levers i have?
help!!!!!!!!!

probably not worth switching to 203mm disk no.

yes they would work but avids levers are way better and would probably be included in a brake set. why have you rejected hydros?