[Mgs] Fw: MGB rear brakes

[Simon Matthews]

Paul,

Thanks for that explanation. I think that it matches the diagram on
the second page of that patent that I referred to.

Presumably, the way it works is that when the pedal is initially
pressed, the spring causes the secondary cylinder to move until the
primary cylinder has moved enough to begin to raise the pressure in
the primary circuit, at which time the force from the fluid will
exceed the force from the spring. Is that right? Or is the spring only
there to limit the movement of the secondary piston when the pedal is
NOT pressed?

Simon

On Thu, Feb 26, 2009 at 1:15 AM, Paul Hunt <paul.hunt1 at blueyonder.co.uk> wrote:
> The pressure *does* equalise in the MGB master cylinder.  The pedal pushes on
> the first stage of the piston, that pushes on the fluid for the primary
> circuit (front brakes) which pushes on the second stage of the piston, which
> pushes on the fluid of the secondary circuit (rear brakes).  There is a spring
> keeping the two sections of the piston apart.  It is not until both circuits
> have taken up all the free play that either circuit starts developing any
> pressure, which means that the pressure in both circuits is equal - under
> normal circumstances.
>
> PaulH.
>  ----- Original Message -----