proportioning valve effectiveness - was monkeylads

[Huw Powell]

> Just how effective (accurate?)can the proportioning valve be?
>   Under braking, the relationship between the body and the axle
> changes due to the nose of the vehicle dipping and I guess the rear lifting,
> which activates the lever and reduces the brake fluid flow to the rears so
> they don't lock up.  Seems pretty imprecise.

I don't see why... whatever relationship there is between body/wheelbase
angle and braking traction should be easy to build into that simple
flow control lever - especially if that relationship is linear.

This also takes into account vehicle loading (fore/aft).  More weight in
the rear, for instance, allows more use, relatively, of the rear brakes.

--
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/