In a message dated Thu, 27 Jun 2002 2:35:09 PM Eastern Standard Time,
ptegler@gouldfo.com writes:
> The VTR site has it right. I once drove a Spit for 130 miles
> with no back brakes. No fluid loss either (other than the orig
> when the line broke) So I'm inclined to believe what I always
> have... it seals it off.
In response to the note from "Woods, Ed":
> I thought that it was the consensus of the List that the PDWA did not shut
> off the offending part of the braking system when tripped; that it is only a
> device to give an electrical warning. Then I found the following on the VTR
> website.
>
> What gives??
>
> "Front or Rear brakes bled, but no luck at other end
> Your Pressure Differential Warning Actuator (PDWA) may be tripped.
> This would close off either the front or back hydraulic circuit and leave
> the other
> functional...."
I can only say that the VTR site is WRONG in this instance. (I'll have to take
a look at that and see about getting it changed.) Various Triumph Official
Workshop Manuals are quite clear in their explanation of the PDWA as just that:
a pressure differential WARNING ACTUATOR. It turns on the dash warning light
when tripped; nothing more.
In the Girling dual-circuit master cylinders, it is a "tipping valve" that
blocks off the leaky side of the system.
--Andy Mace
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