Help!! Golf Mk4 probs

[Audidave]

Hi all, I recently bought a mk4 1.6 2003 golf as a second car,
It had been sat for about six months without moving,
I have stripped & cleaned the brakes + new pads but the pedal goes to the floor & the red stop lights flashes then the engine goes berserk. Can't find a vacum leak anywhere & I also changed the master cylinder as I was convinced that was the issue.
Any advice would be much appreciated
Cheers
Dave

[Wazzzer]

if the fluid has run dry you will need to find someone with vag com to prime the ABS unit with fluid again

[Audidave]

I had this problem before there was anything removed, the pedal is fine with the engine off, if I disconnect the vacum pipe at the throttle body & plug it then start the engine the brakes are fine.

[Wazzzer]

Checked the one way valve?

[Audidave]

Is that the one on the vacum pipe?

[Wazzzer]

Yeah that's the one. You've also got one going to the servo from the other side of the inlet

[Audidave]

Where exactly is that one? Cheers