<div dir="ltr"><h3 style="box-sizing:inherit;margin:1.7rem 0px;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-variant-alternates:inherit;font-stretch:inherit;font-size:1.3rem;line-height:1.3;font-family:Barlow,sans-serif;font-kerning:inherit;font-feature-settings:inherit;vertical-align:baseline;color:rgb(0,0,0)">DOT 5</h3><p style="box-sizing:inherit;margin:0px 0px 1.125rem;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-variant-alternates:inherit;font-stretch:inherit;font-size:1.3rem;line-height:1.5;font-family:Graphik,sans-serif;font-kerning:inherit;font-feature-settings:inherit;vertical-align:baseline;color:rgb(0,0,0)">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.</p><p style="box-sizing:inherit;margin:0px 0px 1.125rem;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-variant-alternates:inherit;font-stretch:inherit;font-size:1.3rem;line-height:1.5;font-family:Graphik,sans-serif;font-kerning:inherit;font-feature-settings:inherit;vertical-align:baseline;color:rgb(0,0,0)"><br></p><p style="box-sizing:inherit;margin:0px 0px 1.125rem;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-variant-alternates:inherit;font-stretch:inherit;font-size:1.3rem;line-height:1.5;font-family:Graphik,sans-serif;font-kerning:inherit;font-feature-settings:inherit;vertical-align:baseline;color:rgb(0,0,0)">As counterintuitive as it is, <span style="box-sizing:inherit;margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:600;font-stretch:inherit;font-size:inherit;line-height:inherit;font-family:inherit;font-kerning:inherit;font-feature-settings:inherit;vertical-align:baseline">DOT 5</span> 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.</p><h3 style="box-sizing:inherit;margin:1.7rem 0px;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-variant-alternates:inherit;font-stretch:inherit;font-size:1.3rem;line-height:1.3;font-family:Barlow,sans-serif;font-kerning:inherit;font-feature-settings:inherit;vertical-align:baseline;color:rgb(0,0,0)">DOT 5.1</h3><p style="box-sizing:inherit;margin:0px 0px 1.125rem;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-variant-alternates:inherit;font-stretch:inherit;font-size:1.3rem;line-height:1.5;font-family:Graphik,sans-serif;font-kerning:inherit;font-feature-settings:inherit;vertical-align:baseline;color:rgb(0,0,0)">Despite having that 5 in its name, DOT 5.1 is a whole different beast than DOT 5. <span style="box-sizing:inherit;margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:600;font-stretch:inherit;font-size:inherit;line-height:inherit;font-family:inherit;font-kerning:inherit;font-feature-settings:inherit;vertical-align:baseline"><a href="https://www.eeuroparts.com/Parts/71260/Brake-Fluid-DOT-5-1-500ml-100951/" style="box-sizing:inherit;margin:0px;padding:0px;border:none;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;font-size:inherit;line-height:1.3;font-family:inherit;font-kerning:inherit;font-feature-settings:inherit;vertical-align:baseline;text-decoration-line:none;outline:none;color:rgb(210,71,0)">DOT 5.1</a></span> 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.</p></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, May 13, 2024 at 12:51 PM Gary Forsmo <<a href="mailto:gbforsmo@gmail.com">gbforsmo@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">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">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">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, depending<br>
> > on<br>
> > where the leak is.<br>
> ><br>
> > > Searching for GE or Dow Chemical, as a manufacturer of DOT 5, seems 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 learned<br>
> > over<br>
> > the years of researching DoT-5.<br>
> ><br>
> > --<br>
> > *******************************<br>
> > Jim Adney, <a href="mailto:jadney@vwtype3.org" target="_blank">jadney@vwtype3.org</a><br>
> > Madison, Wisconsin, USA<br>
> > *******************************<br>
> ><br>
> > _______________________________________________<br>
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