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1979-1993 & 94 Conv [Subscribe to Daily Digest] |
I do not have a definite answer, but here is what I would check.
Since you did not report any master bubbles while pumping any other caliper, I am leaning away from a bad master cyl seal. However, if your pedal slowly sinks under light pressure(when all bleeder valves are tight), then you probably have a bad master seal. You can rebuild, but often old cylinder bores are pitted, which can quickly tear the new seals.
If there were bubbles at other corners, I would also check the orings on the resevoir nipples tht plug into the master cylinder.
You also have reported no fluid leaks at master brake line connections, so I don't think air is coming in at the fittings(double check these to make sure). Also, loosen the nuts that hold the master to the pressure booster and take a peak behind the master for fluid leaks that could let in air.
You might not be closing the bleeder completely when your helper lifts off the pedal. I would close the bleeder valve completely and clean off the threads with brake solvent spray and wipe it dry. I'm wondering if there is a piece of dirt in the threads that makes the screw feel tight, while it is really not, and you are pulling air back in when the pedal is released. This is far fetched, and the more I think about it the less I like it.
Why not build yourself a pressure bleeder out of an old bike tire. Cut a tube about 1 foot on either side of the valve. Close one end off with two strips of metal or wood clamped with a vice grip or small C-clamp. Then stretch the open end over the resevoir opening and hold the turbe there with a hose clamp. Next pump up the tube until it swells like a small balloon...give or take 10 psi. Open the bleeder screw and bleed until no more bubbles. Keep an eye on the resevoir so it doesn't run dry. Look for leaks when the bleeder valve is closed while the tube is pressurizing the system.
Good luck.
posted by 208.208.152...
, Tue, 30 Dec 2003 10:46:33
, Tue, 30 Dec 2003 06:30:26, Tue, 30 Dec 2003 20:53:39
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