Having re-set the pwa myself, it's not very difficult. Simply remove the
electrical sending unit (I think it's plastic?), and insert a small rod (a
small awl will do) and re-centre the device. I had to do this after
replacing the master cylinder and bleeding the brakes on my TR6.
Hopefully if I missed something here, someone else will correct me.
Robert Carley
73TR6
On Tue, 28 Jan 1997, Barry Schwartz wrote:
> > the ŞBRAKEŞ light had been pulled from its red lens by the DPO and left to
> > dangle behind the dash. He did it, apparently, because the light is
> constantly on, > even though the all brakes are working fine. Who can tell
> me how I ought to > track down the reason for its activation??
>
> *************************************************************
> What it sounds like, as has already been discussed on this subject is that
> the previous owner had a failure that caused the shuttle to become off
> center, indicating a failure. Just simply fixing the problem and not
> re-centering the shuttle would cause the symptoms you describe. So, it
> appears that you must re-center the shuttle. Barring a shorted swith
> contact inside the PWA itself or some other electrical problem you must
> detirmine which side was originally the failed side. If you take the switch
> itself out of the PWA you can look down inside and see which way the shuttle
> has moved. The side that the center section of the shuttle has moved to is
> the 'failed' side. Some members of the list have suggested or indicated
> that you can lever the shuttle back into position with a small diameter
> stiff rod. The other way would be to hydraulic the shuttle back into
> position by opening a small amount, a bleed screw on the 'un-failed' side
> and carefully apply pressure until the shuttle snaps back into position.
> Having never done either procedure I can't say how easy or difficult either
> one would be. Although any good repair manual should have a more detailed
> description of the process.
>
> There is also a good article on the VTR website about the PWA.
>
> Hope that helps-
>
> Barry Schwartz
> Bschwartz@encad.com (work)
> Bschwart@pacbell.net (home)
> (San Diego)
> 70' Spitfire (major surgery almost done) , 72'-V6 Spitfire (daily driver)
> 70'GT6+
>
>
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