Hi guys hope you can help, this one has got me baffled.


Audi A4 B8 2.0 TDI S-line 2008.

Ok Changed out the front and rear pads over the weekend and now I have a soft brake pedal that travels to the floor, at first I though air might have got into the system somehow so used my easy bleed and flushed the system out but know change.


When engine is not running the brake peal is hard with no movement at all even with a good amount of pressure on the pedal, but when engine is running the pedal is soft and will travel to the floor. My first thoughts are master cylinder but how can the brake peal be hard with no movement t all when engine is off ? but when engine is running the pedal is like a wet sponge.

I would be most grateful if you can help in this matter as I have MOT due soon and nee to fix the problem.

Also if you think it is the master cylinder where is the best place to get one?

Thanks again in advance.