Brake Master Cylinder

[FiveBellies]

Good evening all, my problem started with my original master cylinder leaking into the servo which was then slowly being pulled to the vacuum pump, so during the Easter holidays decided to change the master cylinder and servo and bought both from a breakers yard. My car is a 2008 E320 Cdi W211 so no SBC. I've installed the new master cylinder and servo and have bled the calipers so no air comes out, but my pedal when car is running, still slowly sinks to the floor. I've bled it multiple times, using 2 man method and with the pressure bottle method. I've even tried bleeding the ABS Module, I've also bled straight from the master cylinder itself. So started suspecting another faulty master cylinder, but the breakers is saying that it has to go on Star, does it really need that??
Any help is much appreciated.

Thanks

 

[Martin 1]

No, the "new" cylinder is shot, tell him you've been to MB.

 

[FiveBellies]

No, the "new" cylinder is shot, tell him you've been to MB.

Thanks Martin, knew I wasn't going mad.