Thanks..Brake wise im using 7.5 s disks braided lines at wheel end..Master cylinder ( CLUTCH ) is 0.75" bore with 0.50" rear wheel cylinders..check the sizes when ordering as they vary otherwise you could get sent the wrong ones...Also depending on your back plates the location dowel on the rear cylinders may need re-drilling..from memory i think the rear cylinders came standard on early GT's..
Re your brake set up, I found this on Keith Calvers site
For information sake, the Mini master cylinder has a 0.70” bore. The old Cooper 997 had a bore of 0.750” largely because of the pathetic size of the discs - a great deal of pressure was needed to slow the car down but would be ace on a four-piston caliper set-up. The old Austin 1300 also had a 0.750” master cylinder. Both of these types are desperately rare now though. Some misguided folk have actually fitted a clutch master cylinder in place of the brake one as it also has a 0.750” bore. This is EXTREMELY fool-hardy as it has no internal return feature, so could leave the brakes on all the time once applied!
How have you overcome this or has this never happened to you?