So after rebuilding all my calipers and switching back to DOT 4 fluid, even without the engine running I found
the brake pedal would just go all the way to the floor with only mild
resistance, while making a swooshing or mechanical wheezing sound.
I took the master cyl to the local Napa store but we were unable to identify
which new one would replace it( it is an aftermarket cylinder, but I have no idea which one), so I sent it out for rebuilding.
Brought it home, bled all the lines, and the brakes are doing exactly the same
thing-- pedal behaves in same way (engine not running).. No change in fluid
levels in the reservoir, no leaks. There was no fluid at the pushrod end of the
m/c when I took it off before.
AFAIK there are 1.0 possibilities-- the master cyl main seals are letting the
fluid pass from one chamber to the other inside.
Which means the "rebuild" job wasn't done at all or was done poorly.
Any other ideas?
Jim
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