Hi

I hope that someone reading this can help out here - I'm lost.

Step son currently has his mondeo on the driveway, and has replaced front discs and pads. Changed them properly as far as I can tell - pressure bled etc.

With the front end on stands, the wheels off and the engine on, the brake travel is fine.

Put the wheels on, engine running, all is fine.

Put the car back down on the deck, and pedal travels an alarming distance, appears to be a couple of inches away from end of travel. Pumping the brakes bring it back to normal. If the accelerator is blipped, either driving or sitting at neutral, the brake pedal drops drastically in terms of where the brake point is. Servo has been tested as per the suggested Haynes manual method i.e. cvaccum is fine. No fluid leaks can be found. It appears to happen only when on the ground. Can anyone help?

Common sense tells me that if the problem is there only when the car is on the ground then the flexi hose is the problem, but cannot find anything wrong at all.

Thanks in advance.