<VV> Brake System Difficulties

MarK Durham 62vair at gmail.com
Mon Feb 16 11:01:55 EST 2015

Phil, I think your suspicions are correct. You can get a rebuild kit or
Mark Durham
Hauser Idaho
62 Coupe
On Feb 16, 2015 7:56 AM, "P.H. Raker via VirtualVairs" <
virtualvairs at corvair.org> wrote:

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> ---------- Forwarded message ----------
> From: "P.H. Raker" <n556p at yahoo.com>
> To: "virtualvairs at corvair.org" <virtualvairs at corvair.org>
> Cc:
> Date: Mon, 16 Feb 2015 15:56:27 +0000 (UTC)
> Subject: Brake System Difficulties
> Hello, all,     My '63 Greenbrier has a dual master cylinder that the PO
> says he got from "The Source".  It has always worked perfectly.  Recently
> that has changed.     If I depress the pedal only once and hold it without
> allowing it to move at all (exactly constant pressure), it will hold
> pressure for several minutes.  It will hold either light pressure or very
> hard (panic stop) pressure.  There are no external leaks in the system. A
> "hard, harder, hardest" test is easily passed.  This is the way things
> should be.     If I depress the pedal till it stops and then release a
> little of the pressure, allowing the pedal to move upward perhaps 1/16
> inch, then I can press the pedal significantly farther than on the original
> push.  If I repeat this process 5 or 6 times, the pedal finally reaches the
> floor.  Once I release the pedal completely (to the top of its travel), all
> is normal again.     If I hold exactly constant pressure, the system acts
> normally.  If I allow a little bit of variation in the pressure but never
> completely release the pedal (a situation one can easily enconter such as
> in slowing on a freeway exit ramp), the pedal keeps getting lower each time
> pressure is increased.     It seems as though when the pedal is released
> slightly, the pressure initially vents past the M/C seals rather than just
> reducing pressure in the brake lines.  I don't know how that could happen.
> That's just what the symptoms seem to look like.     Anyone have any
> suggestions? Phil Raker'65 Corsa Cpe - 140/4'63 Greenbrier - 95/4    .

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