Dean, it's been parked so long the rubbers in all the wheel cylinders and MC will be stuffed, also I bet some of the wheel cylinder pistons are frozen in their cylinders.
I'd be buying new wheel cylinders all round, or replace the rears and then fit discs to the front. As for the MC it may just need a clean out and new rubbers, otherwise get it sleeved or replace it.
Brakes are not worth cutting corners with.. for your sake and everybody else's.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.
