Series 3 brakes

Hi got a series 3 on Range Rover axles with the dual braking system but I can't bleed the brakes not sure if the master cylinder is leaking or if I've piped it up wrong.
I've got a master cylinder off of a discovery which has the 4 ports as you look at it the 2 on the right I've sent to the front right hand caliper and the 2 on the left one goes straight to the caliper and the other goes down to a t piece then to front caliper and the other goes to back any help much appreciated thanks