<div dir="auto">Do <b><i><font color="#f44336">NOT</font></i></b> mix DOT 5 with DOT 5.1. They are not compatible. DOT 5.1 is more like DOT 3 or 4.</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, May 13, 2024, 3:45 PM William Hoyer <<a href="mailto:wjhoyer@gmail.com">wjhoyer@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">DOT 5<br>
<br>
Here is what I found about DOT 5 brake fluid. Looks like 5.1 will work OK<br>
but it may not be non hygroscopic. I think I will stick with DOT 3.<br>
<br>
<br>
As counterintuitive as it is, DOT 5 is not intended for use in active<br>
braking systems. This a silicon-based fluid meant to be used in show<br>
vehicles. It’s more of a preservative than actual brake fluid. If you were<br>
to try and use this in a street vehicle, you’d end up with no brakes pretty<br>
soon.<br>
DOT 5.1<br>
<br>
Despite having that 5 in its name, DOT 5.1 is a whole different beast than<br>
DOT 5. DOT 5.1<br>
<<a href="https://www.eeuroparts.com/Parts/71260/Brake-Fluid-DOT-5-1-500ml-100951/" rel="noreferrer noreferrer" target="_blank">https://www.eeuroparts.com/Parts/71260/Brake-Fluid-DOT-5-1-500ml-100951/</a>> is<br>
a glycol-borate based fluid that has a high dry boiling point of 270C/500F.<br>
DOT 5.1 is backward compatible with DOT 4 and DOT 3. In fact, it’s the new<br>
standard for most vehicles.<br>
<br>
On Mon, May 13, 2024 at 12:51 PM Gary Forsmo <<a href="mailto:gbforsmo@gmail.com" target="_blank" rel="noreferrer">gbforsmo@gmail.com</a>> wrote:<br>
<br>
> William -<br>
><br>
> DOT 5 is Hydrophobic ... meaning it does *NOT* absorb moisture from the<br>
> air. Less moisture = less rust.<br>
><br>
> People who are diligent enough to flush & refill the hydraulic brake fluid<br>
> with DOT 3 may never face moisture-induced rust in their master or wheel<br>
> cylinders.<br>
><br>
> I used DOT 3 in my original. one-owner, stock, 1969 1600cc engine<br>
> Squareback car for 40+ years. But I decided to flush the system<br>
> *thoroughly* and replaced the brake fluid with DOT 5 about 10 years ago.<br>
> Just because of the moisture absorption possibility.<br>
><br>
> On Mon, May 13, 2024, 2:28 PM William Hoyer <<a href="mailto:wjhoyer@gmail.com" target="_blank" rel="noreferrer">wjhoyer@gmail.com</a>> wrote:<br>
><br>
> > why do you use DOT 5 instead of DOT 3?<br>
> ><br>
> > I have been using DOT 3 for over 50 years and it has worked just fine.<br>
> > Flush the system every 2-3 years. As I recall, DOT 4 is not recommended.<br>
> ><br>
> > On Mon, May 13, 2024 at 11:48 AM Jim Adney <<a href="mailto:jadney@vwtype3.org" target="_blank" rel="noreferrer">jadney@vwtype3.org</a>> wrote:<br>
> ><br>
> > > On 13 May 2024 at 11:50, Gary Forsmo wrote:<br>
> > ><br>
> > > > The liquid quantities & prices for DOT 5 seem to be all over the map.<br>
> > The<br>
> > > > lowest is $6.42 for 11oz. The highest is $124.95 for 1 gallon.<br>
> > ><br>
> > > The 11 oz bottle would be fine for you, if you only need topping up<br>
> > > quantities. If you pull the master, that might still be enough,<br>
> depending<br>
> > > on<br>
> > > where the leak is.<br>
> > ><br>
> > > > Searching for GE or Dow Chemical, as a manufacturer of DOT 5, seems<br>
> to<br>
> > be<br>
> > > > elusive. But I'm not the most capable "researcher", either.<br>
> > ><br>
> > > I'm not sure how one might confirm that fact. It was something I<br>
> learned<br>
> > > over<br>
> > > the years of researching DoT-5.<br>
> > ><br>
> > > --<br>
> > > *******************************<br>
> > > Jim Adney, <a href="mailto:jadney@vwtype3.org" target="_blank" rel="noreferrer">jadney@vwtype3.org</a><br>
> > > Madison, Wisconsin, USA<br>
> > > *******************************<br>
> > ><br>
> > > _______________________________________________<br>
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</blockquote></div>