Ed,
We agree on the function of the PDWA.
It doesn't appear that the switch holds back any real pressure in the
PDWA so the sealing methodology for a bolt is not a big issue IMHO.
The way I sealed my PDWA was to put one of the EP O-Rings into the
switch hole and snugged down a bolt on top of it. No damage; no leak.
Gary
'75 TR6 Digest
Severn, MD
> I must disagree, I am 99 and 44/100ths percent sure that the PDWA does
not close off the
> brake line with low pressure. It merely moves enough to toggle the
switch which then lights
> the lamp.
>
> It doesn't DO anything mechanical it only senses a pressure
differential.
>
> If I was going to put a bolt in the hole to temporarily seal a leak, I
would first check
> that there is no flange area that might be damaged. For example, a
brake line seals at a
> flared surface, a bolt would damage the surface so that it would never
seal the proper way
> again. A banjo bolt seals on a copper washer (no problem) and a pipe
thread is an
> interference fit (probably no problem but a pipe plug would be
better). I have never looked
> inside the PDWA so I don't know what type of seal it uses.
>
> Ed McGuirk
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