Also tried a few more tests on the handbrake of fail. 100% confirmed i am conected post proportioning valve. I also put my bob janes on. These tyres arent very grippy, so a good test for doing skids. And i disconnected the DCCD. Still no joy.

I also did a little test of holding the HB on, and driving a small amount to 'heat' up the brake pads a bit incase it increased grip. Still no lock up. I did promptly get out and feel the rear disc rotor temps by hand and can confirm that both left and right seam to working as both rotors were quite warm. Fronts were cold as would expect for a short drive. So this indicates that each side is plumbed correrctly.

And i also tried a few cable drum brake handbrakies aswell. The standard brake locks up the bob janes with ease, in a straight line as i have been testing the hydro. So the hydro is definitely WORSE than the regular park brake.

Not sure where to go from here other than try a different rear brake setup?

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Doing it for all the wagons out there