Help please!

i have just installed on my 1977 Mark 2 Wilwood four spot Midilites and rear Audi rotors and Pintara calipers to the rear (courtesy of Paul Dunstan's great Brake Kit Adaptors). I also installed a brand new master cylinder and all braided brake lines.

Now here is my problem. The back brakes remain on and I think it might be the Pressure Differential Warning Switch. I cannot find any other limiting valve in the brake lines. i am told that a liliter was put in to make the old drum brakes at the rear stary 'just' to the face of the drum.

What to do from here? Do I remove the PDWS altogether, or instal a limiter after or before it, so that I can restore brake balance bewteen front and rear?

Any advice would be greatly appreciated.

Start un doing lines to see which one free's up the rears.
Make sure the master is not holding on by undoing the mounting bolts first.

Will try that Mickas. Thanks.

Do I go from the master, then to the PDWS and then progressively towards the back?