Need Help with low brake pedal/air possibly in brakes

Hi All:

Brought my wagon into my mechanic to have a couple things done, and 3 days later, still no car! The brake pedal had long travel to stop and he identified that it should have a new master cylinder. Bled the brakes several times and the pedal went down to the floor. Switched out with another master cylinder and after spending almost seven hours trying every bleeding pattern, the pedal still goes down to the floor. All brake lines have been checked, brakes like new front and back. Proportioning valve working correctly.

Any ideas here? There are no bleeders on the Bosch ABS controller. Not sure if this is the Bosch 2 or 3 system (1994). He sees no possible way for air to be getting in the system.

HELP!

Did you bench bleed the master cylinder? If not, there is air in it. I just went through the same thing. I can not seem to get the bench bleed thing right. There were some other issues, but that was one. You have to have the MC on the bench and level. Then transfer it to the car. You could also jack the rear of the car up until the MC is level (real pita). My mechanic bled mine.

Fred thanks. I think he has done this already but will ask first thing in the morning.

So my mechanic got tired of re leering the brakes to no avail. He took it out to test drive it, slammed on the brakes so the ABS would kick in (and it did) and went back to the shop and bleed them again.

Bingo! That is what it needed as now all the air is out and the brake pedal is up and firm once again.

I had the same trouble with a car I did and no matter how I bled the line I always had soft pedal. I ended up taking it to a shop that had a pressure bleeder and it worked the first time. He said it was because of the ABS system. So now when I take apart a system I do it one at a time and clamp lines to calipers before removing anything then do the same to the other side. The back isn't as crucial.