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Subject: "PDWA Switch questions..." Archived thread - Read only
 
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Conferences Spitfire Hangar General Spitfire Discussion Topic #142
Reading Topic #142
Jeff McNealadmin
Charter Member
7230 posts (Someone who doesn't have as much free time as he used to)
Sep-28-02, 11:11 PM (PST)
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"PDWA Switch questions..."
 
I made an interesting discovery this afternoon as I attempted to connect one of the short brake lines from my 1968 brake master cylinder to the PDWA valve and switch I purchased separately some time ago. The threads on the PDWA are larger than those coming from the brake line. I think the brake M/C is maybe 7/16ths and the PDWA unit is 1/2".

What's the deal here? Did Triumph change the thread spec on later brake systems and perhaps this is what the PDWA is from?

Oddly, I noticed that one of my brake circuits terminates with the larger fitting while the other uses the smaller connector. Very curious. Looks like the double flaring kit is going to be pressed into service very soon! Or are there adapters that I can purchase to give me the correct sizes for the fittings all the way around?

Best wishes,

Jeff
San Diego, California
'68 Spitfire Mk3 project aka "Mrs. Jones"
'70 GT6+, my "accidental" resto project


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catfishphil
Charter Member
11 posts (Aims window washers to squirt other drivers)
Sep-29-02, 05:47 PM (PST)
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1. "RE: PDWA Switch questions..."
In response to message #0
 
   Hmmm - I ran across this when shoving a small cap (dual line 1976-1980) brake master on my '75... I doubt the DOT would allow adapters for critical safety's sake. Anyhow, I've never, ever seen 'em. Luckily I grabbed the small brake lines with the MC from that Florida junk yard after the big cap MC gave up, and switched the fittings so I could make it back home to LA. As you have probably discovered by now, you can get the fittings at most auto parts shops - even if they are already installed on brake line. Which reminds me - better get my brakes done and get back on the road now that cooler temps are here!

Catfish Phil, 1975 Topaz, uh, okay, Orange Spitfire 1500


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Richard & Daffy
Charter Member
1434 posts (An "official" TTN Senior Wrangler)
Sep-30-02, 01:27 AM (PST)
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2. "RE: PDWA Switch questions..."
In response to message #1
 
To quote from the Rimmers catalogue:

"Imperial brake hydraulics and fittings were used on all Spitfire models (whether single or dual-line sytems) up to, and including, the Spitfire 1500 (to chassis numbers FH80,000 for export, & FH 130,000 for the UK).

"On the Spitfire 1500 only, from FH80,000 (export) and FH130,000 (UK), a curious mixture of Metric and Imperial brake hydraulics was introduced. The Brake Master cylinder and the PDWA valve had metric threads, as did the 2 connecting pipes. However, the 2 pipes that 'exited' form the valve had metric threads, but where they connected to the 3-way brake junction (front circuit), and the double male connector for the rear hydraulic circuit, the threads were imperial. All other brake hydraulic parts used imperial threads."

Don't know how helpful or relevant this is - for Jeff this should be totally irrelevant, unless you've managed to get a 1500 PDWA valve somehow. Anyway, thought I should bring it up in case it helps.

Richard & Daffy


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Jeff McNealadmin
Charter Member
7230 posts (Someone who doesn't have as much free time as he used to)
Oct-01-02, 09:08 PM (PST)
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3. "RE: PDWA Switch questions..."
In response to message #2
 
Just an FYI, I found out what's happening thanks to Nigel at Spitbits. These tandem brake masters and the PDWA switch have both large and smaller sized openings to prevent anyone from mixing up the lines, or some such thing! I've got my fuel system in place now and the brakes will be ready to bleed just as soon as I get my hands on the fittings to connect the forward port of the brake M/C to the PDWA assembly. Unfortunately, I do not have this short piece and finding the correct fittings is going to be a challenge.

Best wishes,

Jeff
San Diego, California
'68 Spitfire Mk3 project aka "Mrs. Jones"
'70 GT6+, my "accidental" resto project


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