proportional valve: how important to have working one?

[james accordino]

I think something is definitely wrong.  After I got
mine to work again, I played with the setting (that
slide nut the spring attaches to) with the ABS off
until the rears (usually the right rear) locked up
first.  Then I backed it off just a hair.  Now after a
real hard run with some serious braking, the rear
rotors are smoking hot.  They do stay nice and shiny,
and I can definitely say the cars braking is more
stabile (much less nose dive or porpoise) and is
accomplished in a shorter distance.

Jim Accordino

--- Erik Gerrits <erik_gerrits at yahoo.com> wrote:
> I took mine out completely and I haven't noticed a
> difference.  The rears still don't seem to be
> working
> very much.
> Erik Gerrits
> 87 5KCSTQ
>
> --- Bernard Littau <bernardl at acumenassociates.com>
> wrote:
> > > This is a dealer-only part, I'm told, and is
> quite
> > expensive even
> > > with List
> > > discounts.
> >
> > > >Did anybody feel a difference in praking after
> > replacing bad proportional
> > > >valve?
> > > >
> >
> > I replaced mine with a used one fresh off a
> > front-end wreck 18 months ago.
> > I remember it was expensive for a used part.
> >
> > My original had been left connected when the
> > suspension was dropped, so the
> > spring was over-stretched and the arm was mangled.
> > Near as I could tell it
> > was always allowing the minimum brake effect.
> >
> > The replacement appears to be working correctly,
> but
> > I have never noticed a
> > difference.  I've certainly never locked up the
> > rears without the fronts
> > locking first with either proportioning valve.
> >
> > I did buy a fitting that can be used to "bypass"
> the
> > valve, which would
> > present the maximum brake effect to the rears, but
> I
> > never installed it.
> > One of the reasons I didn't try it is because it
> > appeared to me the
> > proportioning valve never lets 100% brake effect
> > through, which the fitting
> > would do.  I guess I should try it some time and
> > report back.
> >
> > Best,
> >
> > Bernard Littau
> > Woodinville, WA
> > '88 5ktq
> >
> >
>
>
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