Rear Disc Brakes

[Andrew Shrimpton <andrew@hickeycontractors.co.nz>]

I am in the process of installing disc brakes (off Nissan
Silvia/180SX) to the rear of my BT7, already have 4 pot Austin
Princess calipers on front.

Plan to run dual circuit system with adjustable brake bias but now
need to decide what size master cylinders to use. Has anyone done a
similar installation who can give me some pointers. Also did you use
brake boosters?

Thanks
Andrew Shrimpton
BT7
Rotorua
New Zealand