Trouble with brake bleeding, I can't get any pressure in the system Options

[Lozgib]

Hi. I'm new to Porsche 914 ownership so please go easy on me. I have owned vw splitscreen buses for 30 years and restored loads of them though.

I bought a California 914 a few months back that is running fine now but had been sitting for a number of years needing the brakes restoring as all four callipers had sized and master cylinder leaked.

I replaced all four callipers with rebuilt OG units from a reputable USA supplier together with a new master cylinder. I've bled the system 4 times using the easy self pressure method and combined traditional two person method and also combined both together as described on forums.

I get clear brake fluid at each wheel with no bubbles but I have no pressure at all at the pedal. It goes straight to the floor.
I've read every brake thread on this and other forums and can't find a solution. I have not replaced the pressure regulator as they aren't available her in the uk but would that cause zero pressure?

I'm thinking there may be an issue with one or more of the callipers. I've got no leaks I can detect on the system. I'm stumped and lost for what to try next?

Any help would be appreciated.

[Lozgib]

Wow guys thanks for all the helpful comments and suggestions. Really appreciated.

I guess it's my fault not giving enough detail but to clarify. I've searched all threads I could find and followed all the advice I could find re bleeding. I'm using a self bleed system we call easy bleed in uk with 15psi pressure. I've done the advised pressure bleed together with the pump the pedal too as described. I've done it so many times I've used over 2litres of dot 4.

I like the idea of blocking off the four calipers and seeing if I can get any pedal. I will def try that to see if it's the MS that's failing rather than a calliper. So thanks for that advice. I can there after if ok work out which wheel is the issue one by one.

I can't recall which MS I bought but it was via Porsche dealer in USA but I'm beginning to suspect that the MC may be the issue. I did have issues getting the two inlet grommets to fit snug and although they don't leak I wonder if these are not seated correctly. If the MC is failing internally it may be the answer. Blocking all four callipers as suggested will hopefully give the answer next weekend.

The issue of the font callipers being the wrong way round as suggested will be explored too. From memory the bleed nipples are at the bottom of the calliper not the top. The rears have two nipples each.

So to Summarise I have no pedal at all. Never any pressure but have no bubbles in the system. Used the high pressure bleed and traditional friend bleed methods and also combined with pumping the pedal together with the pressure system. All a number of times and never any pedal resistance. After thinking and getting all your helpful comments it makes me think it's the new MC that must be the issue. I am reluctant to remove and refit as it was a pain to fit with the two inlets but if needs must then that's the way forward.

I'll update next weekend after hopefully finding the issue. Once again thanks for all the very helpful suggestions.
Loz