Thanks Bfit. What do you think, the valve maybe?
I have read that the proportioning valve can cause these sort of problem , I personally can’t see how.
I have not striped a valve out of a 75 model , I’m familiar with the earlier models.
Which control rear whell pressure with what I would call a modulation valve.
The spool moves to restrict the port area to the rear hence reducing the pressure.
I’m thinking do you have any line pressure valves fitted , your original calipers should have springs behind the pistons to keep the pads out .
If you have no line valve to hold residual pressure in the lines , then that can cause this problem.
What I don’t get , if I read your post correctly .
With the line clamps , soft pedal yes
Removed clamps and hard pedal . If that’s right it is odd to say the least.
I have to say I do not agree with clamping brake lines.
Now when I had wilwood calipers I did not have line valves, I always had to two tap the brakes the get a full pedal