proportional valve: how important to have working one?

[Erik Gerrits]

I am with you in thinking that something may still be
wrong.  I have bled the brakes numerous times to make
sure that I have fluid.  Now with the proportioning
valve removed and a rebuilt MC the rears are slightly
engaging but the fronts lock up.  It has made today's
driving really fun, 6 inches of new snow.  Every time
I used the brakes the fronts were locking up.  The ABS
will not turn on and that is the only thing left that
I can think of as to what the problem is with my
brakes.  The fuse is fine.  If anyone has any idea let
me know.

Thanks,
Erik Gerrits
--- james accordino <ssgacc at yahoo.com> wrote:
> 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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