When I rebuilt the Greenman (My departed TR4), I went with Dot 5. I was more
worried about the caustic effects of Glycol on automotive enamel. By some
accounts Dot 5 causes swelling of the rubber parts. I didn't observe anything
like that in the 18 years I owned the car. The only brake issue I did have was
finding out I had installed the PDWA valve backwards. Otherwise Dot 5 worked
just fine.
I did flush the system yearly though, which is what they advise you to to with
Glycol brake fluids too. Greg Petrolati Champaign, Illinois That's not a
leak... My car's just marking its territory...
From: don@carterdesignassociates.comTo: greenman62@hotmail.com;
hottr6@hotmail.comCC: fot@autox.team.netSubject: RE: [Fot] Brake PDWA
blockDate: Thu, 23 Aug 2007 10:46:32 -0500
Thanks Greg.
You're not the first to suggest that Dot 5 may be the problem. I've used it
for years because the car sits-up without running much most of the year. I
will use it one or twice each month. Glycol based fluid (Dot 4) just caused
me so much trouble with eating up Master cylinder, brake cylinder, and slave
unit seals, not to mention the paint surrounding the master cylinders after it
ruins seals when the cars sit for two weeks at a time without running. If
this cause turns out to be the silicone fluid, I would really be surprised,
but as I've said I'm almost ready to try anything. I'll try another weekend
of test and let you know. I do know the PDWA is not in backwards. Thanks
again.
Don W. Carter, AIA
Carter Design Associates
6213 Skyline Dr., Suite 100
Houston, Texas 77057
(713) 529-2288 Telephone
(713) 789-2330 Fax
don@carterdesignassociates.com
-----Original Message-----From: greenman62@hotmail.com
[mailto:greenman62@hotmail.com] Sent: Wednesday, August 22, 2007 9:38 PMTo:
Shane Ingate; don@carterdesignassociates.comCc: fot@autox.team.netSubject: RE:
[Fot] Brake PDWA block> My $0.02. Could the DOT 5 fluid be the cause, I mean,
if there> is air/water in the RF caliper could this cause the LF to lock
earlier?Ermm... Isn't Dot 5 silicone? If so it's not hydrophyllic. Dot 4 and
the other glycol-based brake fluids are Hydrophyllic and will absorb water.You
may want to check if the PDWA valve is installed in the correct direction. If
it's in backwards it could be causing your symptoms (don't ask me how I
know)Greg Petrolati Champaign, Illinois That's not a leak... My car's just
marking its territory...
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