Randell's scenario is the most likely, but there is another possibility,
depending on how your brakes are set up. Many many years ago
the brakes on my Cobra exhibited the identical symptoms. I asked
around (no Internet in those days) and was told by a British car
mechanic that the problem was in the calipers. I rebuilt them, but
the symptoms remained. Finally I decided the problem must be
in one or both of the master cylinders. Cobras have two brake
master cylinders with a balance bar in the pedal linkage. While
I was trying to disconnect the linkage, I noticed that I couldn't budge
the balance bar, which was cocked at a slight angle. Turns out the
problem was corroded linkage causing there to be continuous pressure
on the front master cylinder push rod. A little grease fixed the
problem.
Roland
On Mon, 4 Aug 2003 08:39:16 -0700 "Randall Young" <Ryoung@navcomtech.com>
writes:
> > Could this be caused by the piston in the master
> > cylinder not being allowed to return all the way back to the end
> > cap of the master cylinder where the push rod enters the master
> cylinder?
>
> Yep, exactly. Try cracking the fitting right at the MC outlet, to
> be
> certain it's not something funky with the line between the MC and
> the 4-way;
> but the piston in the MC not returning all the way is the most
> likely cause.
> Since you've obviously checked the spring inside the MC, I'd guess
> either
> the pushrod is too long or the pedal is hanging up and not returning
> fully.
>
> Randall
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