[6pack] PDWA switch leak

[David Friedlander]

Cool! I should have remembered that as I rebuilt the PDWA just 3-4 years
ago. Seems 'early' for the o-rings to fail. I know they make o-rings out of
many different rubber compounds.So, because of the 'early' failure, I now
suspect I may have used a correct o-ring size when I last rebuilt the PDWA
but perhaps the WRONG O-RING MATERIAL.

For those interested, see the first chart here, for compatibility of static
and
dynamic seal materials used with brake fluids:

http://www.efunda.com/designstandards/oring/oring_chemical.cfm?SM=none&SC=Brake%20Fluid

I may go with teflon rings, this time.....

Thanks to all for your inputs!

Dave
'74 Six


On Sun, Jul 10, 2011 at 9:54 PM, <lfm614 at aol.com> wrote:

> The electrical switch does not hold pressure the little o-rings on the
> piston inside do.  Not hard to push the piston out and replace the o-rings.
>  If you take the old ones and piston to a local supplier you can probably
> get them for less than $0.50 if you order them you'll pay many times more
> just in S&H alone.
>
> Lou
> 72 Pimento
> ------Original Message------
> From: David Friedlander
> Sender: 6pack-bounces at autox.team.net
> To: TR-6 list
> Subject: [6pack] PDWA switch leak
> Sent: Jul 10, 2011 8:11 PM
>
> Hey team ~
>
> I noticed my brake pedal getting lower, of late. Each time I went for a
> drive I noted it
> was a bit softer pedal. Now I'm at the point of saying I'm not driving ther
> car until I
> figure it out. Tried to bleed the brakes but kept getting bubbles and the
> pedal wasn't
> improving. So, I figured I had a leak in the system somewhere. After
> investigation, it
> appears that when I pump the brake pedal some, I get brake fluid (DOT 5)
> coming up
> out of the PDWA switch though the *top* of the nylon switch, around the
> warning light
> wire. Anyone (everyone) ever had this problem before? TRF wants $58.91 for
> that little
> nylon switch and, if there's a way to fix it without replacing it, I'd sure
> like to know....
>
> Thanks in advance, for any BTDT advice offered.
>
> Dave
> '74 Six
>
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