many thanks for that, feel like I'm going mad with this, never had this problem before.
Re bleeding, I have used a high pressure bleeder, though I didn't have the car running at the time.
Re servo, I have put the original one back on though just about to re-check the connections to it from the pedal as you suggested.
Hopefully your advice will put me back on the right track.
Many thanks again
Hi Mike, thanks for getting back to me.
I'm afraid I have not been able to pin down the original problem again.
Here's the outcome of my investigations.
Today I put a new seal in the servo and that fixed the servo problem but I'm still back to the initial problem with losing pressure.
I also pipe clamped all 4 corner flexes after bleeding air out of system. This gives full pedal even with engine started and holds pressure. If I released 1 clamp only a slight drop in pressure found, which I would think is normal but as soon as I release any of the others in addition to the first one, the pedal drops to the floor.
Have bled the system with engine running as you suggested and taken the car for a considerable drive, to no avail.
Thinking about it tonight, I have a questions you may be able to answer.
As the system holds pressure: engine started with all 4 flexis clamped, everything I have replaced, i.e. master cylinder and all steel brake pipes must be holding pressure and not bypassing or leaking. Do you agree with this?
Just wanted to highlight, 1 brake pipe burst during mot test. Don't know if this has anything to do with my problem.
ps next course of action, a box of swanvesta's!!
Look forward to your response.