"duckbill" <ltcauth13@nospam.cs.com> wrote in
news:47a59dcb2be108e0cbed856546008470@localhost.ta lkaboutautos.com:

> Elle, what you said makes perfect sense, except I never let that big
> master cylinder get below half full. When bleeding the brakes with a
> short stroke, because of the wood, I was especially careful not to
> introduce air. At that point, I only thought I had air in my system.
> I thought I may have introduced air months ago when I used a one
> person brake bleed setup. Never got any air during the bleed. This
> time there were two of us doing the bleed. When It went to floor, I
> thought this could not be possible. Fluid level was fine and by
> continuing to pump the brakes, pedal came up and then we lost it
> again. Yes, I have also introduced air into a brake system before on
> a different car by letting reservior get too low. Did not want to
> repeat that mistake when I was trying to get air out of the brake
> lines. Thanks for your input.
>
>

If the master cylinder piston seals fail,fluid seeps around the seal
instead of being pushed into the brake lines,thus the pedal moves,but no
braking;bacause no pressure is applied to the hydraulic fluid.
I've read that moisture can cause corrosion in the aluminum MC bore and
that erodes the seals(neoprene?),affecting both sides of the system.

--
Jim Yanik
jyanik
at
kua.net