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

even though its piped up wrong by the sounds of it it should still bleed up, does it splash in res when pedals pumped

Hi yes it does if you pump pedal you do get a bit of a pedal and it will hold but as soon as you let go and push back down again it goes straight to the floor there are 3 bleed nippels on each front calipers one either side of the pads and one at the bottom seems the pedal will only go to floor when you slacken the bottom bleed nipple not sure what the other 2 are there for ??