<VV> Brake master cyl failure

Mark Durham 62vair at gmail.com
Mon Dec 27 22:52:36 EST 2010

Mike there you go, I didn't know enough about that year to know if
there was a shuttle, but that is probably the culprit. Mark Durham

On Mon, Dec 27, 2010 at 7:49 PM, Ed Dowds <ed_dowds at hotmail.com> wrote:
> "1969 with recent new master cylinder in past few years using Dot 5 silicon. I
> blew out the right rear hose and have NO brakes. I thought the dual master
> cylinder was supposed to give me something..."
> This comes up on this list, the Corvair Center and some street rod forums I post to.
> I'm beginning to think that the shuttle switch that was included on factory installs  is not working correctly.
> We all know that it turns on a light when you lose brakes on half the system. It works by seeing low pressure on one side and then sliding the shuttle toward that side and allowing the pin switch to drop into the hole created by the movement of the shuttle.
> I suspect that it is also supposed to seal off the low pressure side once it moves the shuttle.
> Perhaps the shuttle seals leak after so many years and once the shuttle moves to the low pressure side it allows the high pressure side to overcome the seals and leak into the low pressure, leaking side.
> Ed
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