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
76 TR6
86 Rx7
88 MR2 Supercharged
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Date: Tue, 12 Sep 2000 22:57:09 -0400
From: "Russ Pagano" <pagano@home.com>
Subject: Re: Pressure Differential Warning Switch
Gary,
I though the PDWA actually moved a shuttle valve to close off a leaking
circuit when it sensed a pressure differential. That's the click you may
hear when bleeding the brakes and have to recenter the valve. I would agree
the electrical switch/warning light is not a safety device in itself and a
bolt to cover the hole where the electrical connection should still allow
the PDWA to operate as intended. I wouldn't want to disagree with the
President of the newly formed TRiumphs Around the Chesapeake (TRAC) I just
don't want someone thinking they should do without the PDWA-guess I'll never
get the new O-rings you have sitting around.
Russ Pagano
71 TR6
Columbia, MD
>>Date: Mon, 11 Sep 2000 20:09:27 -0400
>>From: Gary & Priscilla Klein <gklein@toad.net>
>>Subject: Re: Pressure Differential Warning Switch
>>
>>Jim,
>> [msg edited for space-rp]
>>the device is merely an indicator for the
>>lamp on the dash and not in itself a safety device; you can live without
>>it's services.
>>
>>Gary
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