Re: [DML] Rear Calipers on Ebay

[Martin Gutkowski <martin@xxxxxxxxxxxxxx>]

Can you clarify this please, Steve? The m/cs are identical apart from 
the springs internally. The way they work is very clever and very 
simple, but the maths is a bit brain-bending. (NB this is how I was told 
they work and it makes sense, but a disclaimer applies!)

There are two plungers in a tube. Your foot pushes the first plunger 
directly. The fluid on the other side has an "exit" which is connected 
to the rear circuit. Inside this fluid is a spring #1 which pushes 
against a second sealed plunger, behind which is an exit for the front 
circuit and then spring #2 which rests against the end of the cylinder. 
The proportioning is set purely by the difference in spring rates 
between the two springs.

You can convert a 50/50 cylinder to a 68/32 by swapping out the springs 
from your old unit. Well, in theory anyway, in practice you need to rig 
up compressed air to force the lower plunger out.

I'm running a 50/50 and jag calipers on my own car.

Martin

Steve Stankiewicz wrote:

> The original Delorean MC is a "68/32" and the Saab unit is a "50/50". 
> On the surface it would seam like the difference in the rear is only 
> the difference bewteen 50 and 32 or the Saab unit is 18% more pressure 
> in the rear. This is NOT correct. Automotive braking systems give full 
> pressure to the front wheels, then use an internal or external 
> proportioning valve to reduce pressure to the rear wheels. If the 
> proportioning is done internal to the mastercylinder, you see a value 
> like the Delorean and "68/32". If the proportioning valve is separate 
> from the matercylinder, then no proportioning is done inside the 
> master cylinder and it puts out equal pressure to the front and rear, 
> "50/50" like the Saab unit.
>
>
>  




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