wammers said:

Yes, basically if the rear brakes have air in the circuit then the pedal will go down until that air and the first chamber return spring is compressed before the front brakes receive any push from the servo. So you will get a longer pedal travel. As you would if the rear brake circuit had failed.

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So: bleed the whole system, even if you have only worked on the fronts. I discovered this yesterday afternoon, after fitting new calipers on the front. Somewhere along the way, air has got into the rear system. Take heart, if the pedal was good/hard before, you can get it back there.

Air in the system is more than likely the culprit, just waiting for the pipe clamps ordered to arrive so that i can clamp all three flexi pipes then eliminate front to rear or new master cylinder at fault.

Regards bleeding the system I used an eezibleed with air pressure then with somebody pumping the pedal to the floor closing the bleed nipple before releasing the pedal with the eezibleed connected to try and blast the air out which did push more bubbles through. My next thought is to use the landy for the next couple of days to see if the air accumulates together ready for another bleeding session this weekend, hopefully the jiggling about will help any air to move to a common spot, will wait and see and post a report.

In the past ive never had much of a problem bleeding brakes even when a full new system was fitted to a few classic cars I've done over the years so this is a first, I wonder how they bleed the new system on a production line.