[T3] Battery Install, Oil Change & Brake Fluid Reservoir

[William Hoyer]

DOT 5

Here is what I found about DOT 5 brake fluid.  Looks like 5.1 will work OK
but it may not be non hygroscopic.  I think I will stick with DOT 3.


As counterintuitive as it is, DOT 5 is not intended for use in active
braking systems. This a silicon-based fluid meant to be used in show
vehicles. It’s more of a preservative than actual brake fluid. If you were
to try and use this in a street vehicle, you’d end up with no brakes pretty
soon.
DOT 5.1

Despite having that 5 in its name, DOT 5.1 is a whole different beast than
DOT 5. DOT 5.1
<https://www.eeuroparts.com/Parts/71260/Brake-Fluid-DOT-5-1-500ml-100951/> is
a glycol-borate based fluid that has a high dry boiling point of 270C/500F.
DOT 5.1 is backward compatible with DOT 4 and DOT 3. In fact, it’s the new
standard for most vehicles.

On Mon, May 13, 2024 at 12:51 PM Gary Forsmo <gbforsmo at gmail.com> wrote:

> William -
>
> DOT 5 is Hydrophobic ... meaning it does *NOT* absorb moisture from the
> air.  Less moisture = less rust.
>
> People who are diligent enough to flush & refill the hydraulic brake fluid
> with DOT 3 may never face moisture-induced rust in their master or wheel
> cylinders.
>
> I used DOT 3 in my original. one-owner, stock, 1969 1600cc engine
> Squareback  car for 40+ years.  But I decided to flush the system
> *thoroughly* and replaced the brake fluid with DOT 5 about 10 years ago.
> Just because of the moisture absorption possibility.
>
> On Mon, May 13, 2024, 2:28 PM William Hoyer <wjhoyer at gmail.com> wrote:
>
> > why do you use DOT 5 instead of DOT 3?
> >
> >  I have been using DOT 3 for over 50 years and it has worked just fine.
> > Flush the system every 2-3 years.  As I recall, DOT 4 is not recommended.
> >
> > On Mon, May 13, 2024 at 11:48 AM Jim Adney <jadney at vwtype3.org> wrote:
> >
> > > On 13 May 2024 at 11:50, Gary Forsmo wrote:
> > >
> > > > The liquid quantities & prices for DOT 5 seem to be all over the map.
> > The
> > > > lowest is $6.42 for 11oz. The highest is $124.95 for 1 gallon.
> > >
> > > The 11 oz bottle would be fine for you, if you only need topping up
> > > quantities. If you pull the master, that might still be enough,
> depending
> > > on
> > > where the leak is.
> > >
> > > > Searching for GE or Dow Chemical, as a manufacturer of DOT 5, seems
> to
> > be
> > > > elusive.  But I'm not the most capable  "researcher", either.
> > >
> > > I'm not sure how one might confirm that fact. It was something I
> learned
> > > over
> > > the years of researching DoT-5.
> > >
> > > --
> > > *******************************
> > > Jim Adney, jadney at vwtype3.org
> > > Madison, Wisconsin, USA
> > > *******************************
> > >
> > > _______________________________________________
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