Andrew Mace wrote:
>
> On Fri, 1 May 1998, Andrew Dixon wrote:
>
> > On the topic of the PDWA, I firmly believe one should go through the
> > centering technique whichever method one uses. It's purpose is to shift
> > braking power from a leak in the front or rear.
>
> Well, no, not really. The Pressure Differential Warning Actuator (Warning
> being the keyword here) only serves to indicate a problem in the system.
> If there is any "fail-safe" at all in the braking system relative to
> shifting braking power from a leak, that would be in the dual master
> cylinder (I think that is what the "tipping valve" does.)
>
> > When you bleed the brakes
> > you create a leak and I've found any method causes the PDWA to shift.
>
> Again, you don't create a leak when the PDWA shifts. All you do is
> activate the warning light circuit by means of a mechanical shift of bits
> within the PDWA. Perfectly normal brakes can be experienced with the PDWA
> "uncentered." And it is quite possible, although not always easy, to
> bleed brakes successfully without disturbing the PDWA.
>
> I'll grant you that sometimes it is as hard or harder to recenter the PDWA
> than it is to get it "uncentered" during bleeding. And I'll also grant you
> that when the PDWA itself DOES start to leak, you've got a whole new set
> of problems!
>
> --Andy
>
> * * * * * * * * * * * * * * * * * * * * * * *
> * Andrew Mace, President and *
> * 10/Herald/Vitesse (Sports 6) Consultant *
> * Vintage Triumph Register *
> * amace@unix2.nysed.gov *
> * * * * * * * * * * * * * * * * * * * * * * *
I agree with Andy. Same issue on my SPIT; brakes are great after a
complete rebuild, but could never get the !@#$%PDWA to recenter. The
bleeding went without a hitch on each cornor.
One good thing, I guess....got a pretty red light glowing when we run.
I'm told there is a manual method to recenter the thing, i.e. remove the
end cap nuts, but haven't screwed the courage up to do that yet.
Anyone ever do it that way?
Dennis
75 SPIT
Omaha, NE
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