The old British DOT3 is actually DOT4. BMC used Castrol GT LMA, which is
still available. USA spec DOT3 fluid causes seals to swell. (Or is it not
to swell? To swell or not to swell...that is the question.) Anyway, I
don't think anyone on this list uses DOT3 after all the brake fluid
discussions we have had over the years. ;-)
The most important issue is to change the brake fluid. Every year or two,
depending on how much you drive. Between races if you race. They make red
and blue fluids for racing so you can visually be sure all the old stuff is
out when changing.
Allen Hefner
Norristown PA
On 3/27/06, Jim Johnson <bmwwxman@gmail.com> wrote:
>
> Hey Allen,
>
> Why DOT4 and not DOT3?? Just curious. Didn't these old cars come
> with DOT3 originally?
>
> Cheers!!
> Jim - reassembling Midget in Dodge City
>
> On 3/27/06, Allen Hefner <ajhsys@gmail.com> wrote:
> > David,
> >
> > I would recommend replacing sillycone fluid with a good DOT4 fluid,
> > preferably one designed for racing. Suck the old fluid out of the
> master
> > cyl with an old turkey baster. Fill it with new fluid and bleed until
> the
> > new stuff comes thru at all corners. DOT4 is compatible with the little
> bit
> > of silicone that will be left.
> >
> > For boiling points of wet and dry fluid, check out this chart:
> > www.pegasusautoracing.com/group.asp?GroupID=BRAKEFLUID
> >
> > If he will be racing, he should change the fluid after each race. If he
> is
> > only an occasional racer, change it every racing season.
> >
> > Allen Hefner
> > Norristown PA
> >
> >
> >
> >
> > On 3/26/06, SDOliner@aol.com <SDOliner@aol.com> wrote:
> > >
> > > Going over a friend's recently purchased Bugeye race car, which has
> not
> > > been
> > > driven for quite some time.
> > >
> > > The PO told him that he used silicone brake fluid in the brakes. I
> dipped
> > > my
> > > finger in the master and the fluid is purple, so my guess is that this
> is
> > > silicone.
> > > There is no clutch pedal pressure, and no fluid in that master. I am
> guess
> > > that there is still some in the line. Before topping up the master,
> how
> > > can we
> > > be sre if this is also silicone?
> > >
> > > David Oliner
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