Check Ken Streeter's writeup at
http://www.vtr.org/maintain/brake-bleeding.html. The section "Front or Rear
brakes bled, but no luck at other end" describes what I was talking about.
If the PDWA shifts, it cuts off the failed circuit.
But, as I said in my earlier reply (which won't make the list because I
forgot to remove the trailer), Andy is clearly correct about the safety
function in the master cylinder.
- Hugh
> -----Original Message-----
> From: owner-triumphs@autox.team.net
> [mailto:owner-triumphs@autox.team.net]On Behalf Of ZoboHerald@aol.com
> Sent: Sunday, December 08, 2002 5:37 PM
> To: hfader@usa.net; ryoung@navcomtech.com; triumphs@autox.team.net;
> jerryvv@alltel.net
> Subject: Re: Brake System Conversion TR4A to TR 6 Dual System
>
>
> Randall wrote:
>
> >Jerry, I haven't tried it (yet), but removing the PDWA
> should not be a
> >problem since you're making up new lines anyway. It's only
> >purpose in life
> >is to run the dash light.
>
> Hugh replied:
>
> > Not quite true. It is also a safety device. It isolates the
> front and rear
> > hydraulic circuits. In the event that one of them fails,
> the shuttle valve
> > shifts to cut it off and also turns on the light. The other
> circuit will
> > still work giving you some stopping power.
>
> Sorry, Hugh, but Randall IS CORRECT. The PDWA is a safety
> device, but only
> inasmuch as it serves to activate the warning light. It is
> part of the
> function of the dual-circuit MASTER CYLINDER to shut off one
> circuit in a
> failure and divert pressure to the other circuit.
>
> > It is not a proportioning valve though. So normal brake
> function will be OK
> > without it.
>
> This part is correct.
>
> It's all very clear in the Workshop Manuals.
>
> --Andy
>
> Andrew Mace, Vice President, Member Services
> and 10/Herald/Vitesse (Sports 6) Vehicle Consultant
> The Vintage Triumph Register <www.vtr.org>
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