Last time I posted on this I think I called it PWDA, but hey what's a little
transposition of letters. Here's Nelson Riedel's tome on the subject.
http://lotus-europa.com/files/mc%20rebuild.pdf
I successfully refurbed mine using his techniques after I polished and PC'd
it with clear PC. Looks great. As with Vance, I went down to my local Ace
hardware store. Riedel recommends ethyline propolene material, as you point
out, but hardware store versions will apparently work with DOT 5. I don't know
much about the difference between Buna (nitrile) and EP but this site says not
to use it with brake fluids on one hand , but says Buna is ok with silcone
oils and greases, so go figure. See
http://www.sisweb.com/vacuum/o-rings/buna.htm Tried my nitrile gloves with
silicone brake fluid w/o melting them.
Quoting from Nelson's article
"I've been told there were PDWAs made with different size cylinders. I have
PDWAs from years '68,'70, '73 & '76 and all have 5/16" cylinders. Three use
O-Ring seals as the lower piston in the photo and one uses the more
substantial seal as the upper piston in the photo. I haven't been able to find
a source for the upper piston seals. The O-Rings for the lower piston are
3/16" ID & 5/16" OD with 1/16" cross section --- O-Ring size # 008.; See
http://www.marcorubber.com/ . Ethylene Propylene (EP/EPR/EPDM) is the correct
material. I understand they are available from American Packing and Gasket Co,
www.apandg.com (713) 675-5271 or (800)888-5223. I bought 100 from McMaster
-Carr for a little over $8."
Jerry
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Date: Mon, 22 Jan 2007 10:16:13 -0800 (PST)
From: ronald weber <rmweber_99@yahoo.com>
Subject: PDWA Seals
Hello List,
I'm installing a new brake system into the TR6 and am switching over to DOT5
silicon fluid. Supposidly the new seal kits I used to rebuild the MC & brake
cylinders are suitable for use with DOT 5 however, I have not been able to
locate seals for the double o-ring spool in the PDWA. All the supply shops
around here (Harrisburg) only carry nitrile rings and not the EP or EPDM seals
recommended for DOT5. Does anyone know what size these rings are and where I
might find a couple? Ive seen both #008 & #009 sizes referenced in various
places.
Thanks,
Ron W
71TR6
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