Several years ago some new master cylinder caps got out into the market
without a vent hole....it is a tiny hole, but very important.
This is a long reach for a solution to your problem, but something that
should be checked.
Joe (A)
>
> I had a brake incident yesterday that I have never come across before so
> I am hoping people with more experience may have encountered it and can
> help me make a diagnosis. My daily driver's brakes worked fine in the
> morning (I note that it was below freezing outside). In the afternoon
> the brake pedal went almost completely to the floor and I had what I
> would guess was about 10 per cent of my normal braking capacity. There
> is lots of fluid in my near new master cylinder, the brake warning light
> did not trigger, and there is no visible fluid leak. When I put my foot
> on the break and start the engine the pedal does go down a little so I
> seem to be getting some boost. I did not pump a number of times and
> then try this. I am stumped so I would appreciate any suggestions to
> point me in the right direction. Thank you very much.
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