I had a hell of a time getting the rear brakes to bleed on my 72B. It
turned out I had a small pinhole on the metal tube that runs over the
rear axle. It didn't leak (just a seep around the hole) but it pulled in
air.
What I ended up doing was backtracking the lines to see where there was
brake fluid. There are a lot of areas where you could have a plug or a
leak (fluid and/or air). On my 72B, there is a place in the rear of the
car where the metal tube from the master cylinder ends in a rubber tube
which joins that tube to the tubes that feed both rear lines. I took
that apart to see if brake fluid came out there and then worked my way
back. I hope that makes sense. You could have a collapsed brake line or
a plug. Maybe even a problem still with the master cylinder. Or the
wheel cylinders have a leak pulling air into the system.
You just need to check the system/lines at certain points to see where
the fluid flows and where it does not.
I also now use an Eezi-Bleed system so I don't have to rely on a helper.
David Councill
67 BGT
72 B
73 B
-----Original Message-----
From: mgs-bounces@autox.team.net [mailto:mgs-bounces@autox.team.net] On
Behalf Of Keith G.
Sent: Monday, July 13, 2009 10:50 AM
To: Mgs@autox.team.net
Subject: [Mgs] Brake frustrations
So my '79 B is sitting up on jackstands while a summer marches on. I'm
frustrated with the brakes, being unable to get fluid to the rear bleed
valves.
The background is this: I finally got around to replacing the rear
brake
cylinders, as one was leaking. After getting that done, I was able to
bleed
the brakes to get good pressure in the pedal and good, clear fluid
coming
out of each valve. Feeling good about that, I moved on to other matters
that needed tending to.
The next time I tried he brake pedal, it went to the floor. Any
subsequent
bleed attempts have failed. I can get great pressure to the fronts, but
nothing good is happening at the rear. A replacement master cylinder
helped
only the depletion of my dollars. Someone I talked to suggested I just
remove the valves and let gravity do its thing to see if any fluid leaks
out. Well, not in this case.
Any ideas would be much appreciated. I want to get this thing back on
the
road this summer if possible. Our summers here in the upper American
midwest are entirely too short.
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