proportional valve: how important to have working one?

[Erik Gerrits]

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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