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1. PDWAs and tandem master cylinders... (score: 1): Author: Unknown; Date: Wed, 22 Jan 1997 22:53:11 -0500 (EST); At the risk of a: putting my foot in my mouth and/or b: fanning yet another flame war (one on this list at a time is quite enough, thank you, could we move on?), I'd like to briefly address the quest; /html/triumphs/1997-01/msg00826.html (8,721 bytes)
2. Re: PDWAs and tandem master cylinders... (score: 1): Author: Unknown; Date: Thu, 23 Jan 1997 09:30:50 GMT; This is entirely correct, as anyone can find by disassembling one of these devices. There is a piston internal to the PDWA, normally centered. When a pressure difference occurs, the piston will move; /html/triumphs/1997-01/msg00833.html (9,164 bytes)
3. Re: PDWAs and tandem master cylinders... (score: 1): Author: Unknown; Date: Thu, 23 Jan 1997 09:00:49 +0000; Here's my .02 cents worth on the PDWA. I'm with Andy on this one. My experience with Brake warning lights is that the warning light comes on when the pedal is heading into the firewall! Usually the s; /html/triumphs/1997-01/msg00834.html (8,555 bytes)
4. Re: PDWAs and tandem master cylinders... (score: 1): Author: Unknown; Date: Thu, 23 Jan 97 17:23 EST; Andy, et al, I know I am joining this discussion late, but since my braking system is in pieces, and I am replacing a leaking PDWA , I thought I'd add my understanding. As one of the circuits (front; /html/triumphs/1997-01/msg00852.html (8,477 bytes)
5. Re: PDWAs and tandem master cylinders... (score: 1): Author: Unknown; Date: Thu, 23 Jan 1997 17:25:20 +0500 (EST); Not according to the workshop manuals. Any closing of the system is done in the master cylinder. --Andy * * * * * * * * * * * * * * * * * * * * * * * * Andrew Mace, President and * * 10/Herald/Vitess; /html/triumphs/1997-01/msg00853.html (8,788 bytes)
6. Re: PDWAs and tandem master cylinders... (score: 1): Author: Unknown; Date: Thu, 23 Jan 1997 15:04:51 -0800; Anybody have first hand experience with this happening, whenever I've bled the brake's (effectivly creating a leak in one system) the pedal will fall to the floor. Unless this dual action only happen; /html/triumphs/1997-01/msg00855.html (8,452 bytes)
7. Re: PDWAs and tandem master cylinders... (score: 1): Author: Unknown; Date: Thu, 23 Jan 1997 21:21:13 -0600; i couldn't disagree more with some of the comments about dual circuit brakes- the brake system has two sealed circuits, if a leak develops in one, you'll still have brakes in the other circuit in add; /html/triumphs/1997-01/msg00871.html (8,470 bytes)
8. Re: PDWAs and tandem master cylinders... (score: 1): Author: Unknown; Date: Thu, 23 Jan 1997 22:30:07 -0500; It seems to me that Joe Schneider, Andy M, and others are correct here, the PDWA is merely the device that switches on the brake warning light, and should not be confused with the safety function of; /html/triumphs/1997-01/msg00874.html (7,972 bytes)
9. Re: PDWAs and tandem master cylinders... (score: 1): Author: Unknown; Date: Thu, 23 Jan 1997 22:53:10 GMT; Have you inspected the internals of the unit at all? There are end stops that limits the piston travel - the piston does not block any flow of brake fluid in any position. Period. Egil -- Email: egil; /html/triumphs/1997-01/msg00875.html (8,786 bytes)
10. Re: PDWAs and tandem master cylinders... (score: 1): Author: Unknown; Date: Fri, 24 Jan 1997 09:17:53 -0500; Actually, there has to be. Although there are two separate circuits starting at the master cylinder as noted in other posts, IMHO, the piston itself ~must~ block the flow of fluid; otherwise when you; /html/triumphs/1997-01/msg00883.html (8,746 bytes)
11. Re: PDWAs and tandem master cylinders... (score: 1): Author: Unknown; Date: Fri, 24 Jan 1997 10:22:19 +0500 (EST); Barry, I know exactly what you're saying; I've "been there, done that" as well. But I've also experienced the systems working as they are designed to work. In one of those "catastrophic" failures, on; /html/triumphs/1997-01/msg00888.html (10,695 bytes)
12. Re: PDWAs and tandem master cylinders... (score: 1): Author: Unknown; Date: Fri, 24 Jan 1997 08:28:10 -0800; I have come across two kinds of Girling dual master cylinders. one type has a mechanical connection between the two master cylinder pistons and rely on the PDWA as a warning that one of your brake ci; /html/triumphs/1997-01/msg00892.html (8,543 bytes)
13. Re: PDWAs and tandem master cylinders... (score: 1): Author: Unknown; Date: Fri, 24 Jan 1997 15:33:08 GMT; Sorry if I stated this in a manner that could be misunderstood, but the piston does of course block fluid from one circuit from entering the other - indeed a piston seal, if broken, would cause brake; /html/triumphs/1997-01/msg00894.html (9,766 bytes)
14. Re: PDWAs and tandem master cylinders... (score: 1): Author: Unknown; Date: Mon, 27 Jan 1997 20:46:18 -0500; Actually, this sounds a lot like the type of master cylinder most American cars have, which is referred to as a "floating piston" unit. The pedal is mechanically linked to the piston in the rear half; /html/triumphs/1997-01/msg00980.html (9,282 bytes)

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