This would cause a problem due to every time you depress the brakes or
clutch the fluid is pumped to the slave cylinders causing a vacuum in
the MC which probably managed to suck some air in from the atmosphere
then when you release the pedal the air was unable to get back out
causing the MC to pressurize just like a bicycle pump. This is how your
fluid eventually gets contaminated with water vapour as well, every time
you use the brakes or clutch a small amount of air is pulled in and
expelled and the moisture absorbed by the Brake fluid. Most american
cars have a rubber diaphram under the cover to prevent this, even back
in the sixties.
Just my opinion.
Peter.
>From: Jim Rowan <jimrowan@uic.edu>
>
> Thanks for your all the responses. I think I may have solved it. I
>re-read the brakes troubleshooting
>section of the manual. It said if the brakes are dragging look to see
if
>the filler cap hole
>is plugged. This rung a bell because I recently changed from a plastic
>replacement cap to
>an old original metal cap. I also put an o-ring around the base of the
>filler neck to make an even tighter seal. Sure enough the hole was
plugged
>and I removed the o-ring. I switched back to the
>plastic cap. It also said to not over fill the MC. The fluid should be
1/4
>inch from the filler threads.
>My fluid was way above that to the point that the MC weeped through the
>cardboard gasket.
>This done I went for a ride and the pedal stayed put, no excessive
firming
>up.
>
>Could the problem possibly be that simple? Why would no hole in the cap
and
>an over filled
>MC cause a firming of the pedal?
>
>Thanks again,
>Jim Rowan
>60 Sprite
>
>
>
>
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