I am flumoxed with bleeding the brakes on my 1979 MGB LE--I got the car a couple weeks ago, pedal was very spongy and low, tried to bleed the brakes a few days ago, bleed screw (actually the rear wheel cylinder) was stripped, couldn't tighten it down to seal good, don't mess with cheap fixes on brakes, so got a new RWC.
Installed today, acting odd, hard to bleed, if I open it enough to really let the fluid out it gets awfully bubbly, read about bleeding these, suggests a short opening of the bleed valve just as the pedel goes down. Tried this, seemed to work better as far as air coming out the hose, but still kind of bubbly, but I ran and ran fluid through, it has to have cycled through the system.
Anyway I bled and bled the right rear, then moved on to the other wheels, they all seemed to come out pretty normal-clean, bubble free.
Anyway, the more I bleed the worse they seem to get, now they pretty much go all the way to the floor no pumping up either, they didn't really seem to pump up before, which make me think it might not even be an air issue.
I am thinking there is some issue with the right rear or the master cylinder, so first question, which fitting should be used to bleed the master cylinder?
Other thing, I have worked on lots of british car brake systems, but always older, this is the first with boosted brakse, don't know if the booster could be causing the problem, I don't really know how they work.
Last thing, my bleeding assistant (wife) is running out of patience--so I sure hope the next thing works.
I have a Haynes manual coming but not yet here.