Denatured alcohol.
...Art
On Tue, 30 Nov 1999, James Nazarian Jr wrote:
> After using DOT 5 for the past four or so years mine have started to leak
> as well and at $10 pint it is too much. What do I use to flush the system
> before rebuilding calipers and going back to dot 4.
>
> James Nazarian
> '71 B roadster
> '71 BGT rust free and burnt orange
> '74 BGT going by-by soon
> '63 Buick 215
>
> On Tue, 30 Nov 1999, Florrie & Allen Bachelder wrote:
>
> > Finally, after listening to the debate for years, ' thought I'd try DOT 5
> > myself last summer. Despite THOROUGH flushing, in less than 400 miles my
> > calipers were leaking. In 15 years and untold hundreds of thousands of
> > miles, I have NEVER had an MGB caliper leak. You can bet I was back on DOT
> > 4 LMA (and new calipers!) in a matter of hours! I learned my lesson.
> >
> > Allen
> >
> > >From: Tab Julius <tab@penworks.com>
> > >
> > >Not to dig up an old thread :) but recalling the conversation on silicone
> > >brake fluid and all that fun stuff, and came across this on the
> > >mgcars.org.uk site....
> > >
> > >--------------------
> > >A Tip for all MG's with Pressure Type Brake Light Switches
> > >by Paul Kile, Fair Oaks, California
> > >
> > >For all of you with MGs that have pressure type brake light switches (
> > >MGA's and MGBs/Midgets with single circuit brakes) - DO NOT use silicone (
> > >DOT 5 ) brake fluid in these systems, unless you want to replace your brake
> > >light switch every three months or so. Although none of the recent debates
> > >on silicone fluid seem to mention this, I have had three brake light
> > >switches fail on two different cars, both using silicone fluid. Others on
> > >the Internet have noticed this also. It appears that the silicone fluid
> > >acts as an insulator and prevents the switches from making contact.
> > >
> > >The solution? Stick with DOT 4 fluid and change it yearly, or put in a
> > >mechanical type switch on the brake pedal.
> > >
> > >--------------------
> > >
> > >'s true?
> > >
> > >- Tab
> > >'78 B
> > >
> > >At 01:54 PM 8/30/99 -0700, Max Heim wrote:
> > >>No, I think you are a little confused. *Silicone* brake fluid has never
> > >>been accused of dissolving seals (or anything else). That is its chief
> > >>benefit. DOT 3 or 4 brake fluid is notorious for dissolving paint
> > >>everywhere it drips. It has also been known to dissolve the seals on
> > >>LBCs, *except* for Castrol GT LMA brand fluid. Why is this? Who knows?
> > >>DOT 3 and 4 are performance specs, not materials specs, so it is possible
> > >>that Castrol uses a different formulation than Pep Boys, Mechanics Brand,
> > >>etc. At any rate, there is plenty of evidence in on this subject, and the
> > >>recommendation is clear:
> > >>
> > >>Use exclusively Castrol GT LMA brand DOT 4 brake fluid, *or* completely
> > >>flush your system and convert to silicone brake fluid (DOT 5, any brand),
> > >>since silicone fluid is incompatible with the other variety.
> > >>
> > >>Note that DOT 5 is not an "improved" spec compared to DOT 4, it is merely
> > >>a different chemistry with different benefits. DOT 4 = higher boiling
> > >>point; DOT 5 = non-corrosive.
> > >>
> > >>Some people may not have had any trouble with "off-brand" DOT 4 fluid in
> > >>their MGs -- if so, congratulations, but be aware that there are many
> > >>different sources for brake system rubber components . The next time you
> > >>rebuild, you might not be so lucky.
> > >>
> > >>'nuff said!
> > >>
> > >>
> > >>James Nazarian Jr had this to say:
> > >>
> > >>>I have had dot 5 (silicone) in my brakes and clutch of my mg for about 5
> > >>>years now and I haven't had a single problem. My understanding is that
> > >>>the original and early replacement seals couldn't stand up to silicone,
> > >>>but that the newer replacement seals (within the past 5 years or so) are
> > >>>designed with a slightly different compound will have no problems with
> > >>>silicone. I don't know the difference in the two kinds of rubber or
> > >>>fluids, but I would guess it is related to the same properties that make
> > >>>dot 3/4 take off paint and dot 5 prevent paint from bonding. So far I
> > >>>haven't had any problems with the silicone, but I think there must be
>some
> > >>>truth to the rumor so I would make sure the seals in m/c and s/c are
> > >>>fairly new.
> > >>>
> > >>>James Nazarian
> > >>>'71 B roadster
> > >>>'74 BGT bastardization with big aluminum heart :)
> > >>>'63 Buick 215 cubic inch 'heart'
> > >>>
> > >>>On Sat, 28 Aug 1999, Larry Hoy wrote:
> > >>>
> > >>>> Ken Payne said (in part)
> > >>>>
> > >>>> > I used AP550 for a while ... and [it] seemed to be harder on some
>seals.
> > >>>>
> > >>>> So can anyone tell me about rubber seals?
> > >>>>
> > >>>> What's the deal with certain brake fluids destroying certain fluids?
> > >>>>
> > >>>> Is this problem a thing of the past? Some how I gotta think that
>today's
> > >>>> brake rubber parts must be compatable with DOT 3, 4, and 5 brake
>fluids?
> > >>>> Can anyone enlighten me?
> > >>>>
> > >>>> Larry Hoy
> > >>>>
> > >>>>
> > >>>
> > >>>
> > >>
> > >>
> > >>--
> > >>
> > >>Max Heim
> > >>'66 MGB GHN3L76149
> > >>If you're near Mountain View, CA,
> > >>it's the red one with the silver bootlid.
> > >>
> > >>
> > >>
> > >
> >
> > mg-mg-mg-mg-mg-mg-mg-m-gmg-mg-mg
> >
> > Allen Bachelder
> > '73 B - "done"
> > '76 B - daily driver
> > '73 GT - awaiting front wings
> > '65 B shell - awaiting paint
> > '67 GT - awaiting everthing
> > '57 ZB - parts car or resto-candidate? - awaiting decision
> > '49 YT - in "progress"
> >
> > mg-mg-mg-mg-mg-mg-mg-mg-mg-mg-mg
> >
> >
>
>
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