Trying to bleed the rear brakes. We have a vacuum system to bleed the brakes and it seems to be working properly. We were sucking lots of bubbles through the system along with some fluid but still more bubbles than we thought we should have. I thought maybe I had the bleeder valve open more than I should and it was sucking air down through the threads. So I kept closing the valve a little more and I still see bubbles. Finally I closed the bleeder as tight as reasonable and still seeing bubbles. I am thinking that the bleeder valve has been cycled so many times that the seat is no longer air tight. I don't think the hose is leaking at the bleeder valve because we have a new hose that came with the vacuum kit and its a very tight fit.

I am thinking o purchasing a new bleeder valve fitting and hopefully that will solve my problem?. Has anyone heard of or had a similar problem with a defective leaking bleeder valve, I sure hope so.
Thanks for any come back.
Cleve