Re: [MBZ] DOT4 Brake Fluid

[rickknoble]

Last article. I now know more about brake fluid than
I really ever wanted. Read this all the way through and
you can too.

http://www.mossmotors.com/SiteGraphics/Pages/Brake_Fluid/brake_fluid_long.html

DOT 3,3/4, & 4 brake fluid is glycol based.

Adding borates raises the boiling point for DOT4.

Being that all of the above mentioned brake fluids are glycol based, they are 
all also synthetic.

I have drawn the conclusion, possibly errant, that DOT 3/4 fluid is actually 
DOT 4, just labeled as 3/4 to imply that it is reverse compatible with systems 
that are said to require DOT3 fluid.

Toyota has complained about using Dot4 fluid in some of their autos and lists 
only dot3 as specified for use. I will not be referencing any article on this 
as no one here probably cares.

BTW, Citroën and RR use something entirely different.

A very informative article, all in all.


Rick Knoble

Sent from My Samsung tablet

 Original message 
From Dieselhead <126die...@gmail.com>
Date: 01/03/2014  9:21 PM  (GMT-06:00)
To Mercedes Discussion List 
Subject Re: [MBZ] DOT4 Brake Fluid

>3/4 and 4 is the same thing.  it's all "straight" 4

with no evidence.

What we know is the 4 is different from 3, and that the 3/4 is called
synthetic, but there is no evidence proving compatibility with older
MB brake rubber parts.  Nobody is telling that the "synthetic" is
made from.   It is essentially some bug juice that has a higher
boiling point than the old DOT3 junk, and that boiling point happens
to be at least as high as DOT4.  But boiling point alone does not
prevent it from eating the rubber parts.It may well be
compatible, but there is no evidence to demonstrate that.

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Re: [MBZ] DOT4 Brake Fluid

[Dieselhead]

This sort of explains it
http://www.aus300zx.com/forum/archive/index.php/t-270204.html

Hendrik

who has dot 4


Thanks Hendrik, a good article, but it does not address the synthetic 
stuff that provoked this discussion.  In the USA, the appearance of 
this DOT3/4 "synthetic" stuff has resulted in DOT 4 being 
discontinued in most places.   So, I was glad when I found some 
quarts of Castrol GT brake fluid (DOT4)


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Re: [MBZ] DOT4 Brake Fluid

[Hendrik and Fay]

This sort of explains it
http://www.aus300zx.com/forum/archive/index.php/t-270204.html

Hendrik
who has dot 4

On 04/01/14 13:49, Dieselhead wrote:

3/4 and 4 is the same thing.  it's all "straight" 4


with no evidence.

What we know is the 4 is different from 3, and that the 3/4 is called 
synthetic, but there is no evidence proving compatibility with older 
MB brake rubber parts.  Nobody is telling that the "synthetic" is made 
from.   It is essentially some bug juice that has a higher boiling 
point than the old DOT3 junk, and that boiling point happens to be at 
least as high as DOT4.  But boiling point alone does not prevent it 
from eating the rubber parts. It may well be compatible, but there is 
no evidence to demonstrate that.




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Re: [MBZ] DOT4 Brake Fluid

[Dieselhead]

we kinda settled the 3/4 and synthetic business so there shouldn't be any
confusion anymore.


THere was no such conclusion.  Only anecdotal evidence that one brake 
system lasted a couple of years with no damage evident yet from the 
3/4 stuff.


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Re: [MBZ] DOT4 Brake Fluid

[Dieselhead]

3/4 and 4 is the same thing.  it's all "straight" 4


with no evidence.

What we know is the 4 is different from 3, and that the 3/4 is called 
synthetic, but there is no evidence proving compatibility with older 
MB brake rubber parts.  Nobody is telling that the "synthetic" is 
made from.   It is essentially some bug juice that has a higher 
boiling point than the old DOT3 junk, and that boiling point happens 
to be at least as high as DOT4.  But boiling point alone does not 
prevent it from eating the rubber parts.It may well be 
compatible, but there is no evidence to demonstrate that.


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Re: [MBZ] DOT4 Brake Fluid

[Gary Hurst]

which is great but it's still DOT 3/4 and synthetic, my point being that
those "issues" are already shown here to be specious by young rick.  do you
guys read any posts more than 10 words?


On Fri, Jan 3, 2014 at 8:43 PM, Jaime Kopchinski  wrote:

> I use the MB dealer stuff now too.  Reasonably priced, and for me at least,
> very convenient.
>
> Jaime
>
>
>
> On Fri, Jan 3, 2014 at 7:20 PM, Dan Penoff  wrote:
>
> > With the recent discussion regarding DOT 4 brake fluid, and all the
> > confusion out there with the DOT 3/4 and "synthetics", I decided to just
> > buy a quart of DOT 4 when I was at the dealership today.
> >
> > Not bad, really, when you consider it's for sure the right stuff.
> >
> > $13.20 for a quart.
> >
> > Dan
> > ___
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>
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>
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Re: [MBZ] DOT4 Brake Fluid

[Jaime Kopchinski]

I use the MB dealer stuff now too.  Reasonably priced, and for me at least,
very convenient.

Jaime



On Fri, Jan 3, 2014 at 7:20 PM, Dan Penoff  wrote:

> With the recent discussion regarding DOT 4 brake fluid, and all the
> confusion out there with the DOT 3/4 and "synthetics", I decided to just
> buy a quart of DOT 4 when I was at the dealership today.
>
> Not bad, really, when you consider it's for sure the right stuff.
>
> $13.20 for a quart.
>
> Dan
> ___
> http://www.okiebenz.com
>
> To search list archives http://www.okiebenz.com/archive/
>
> To Unsubscribe or change delivery options go to:
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>



-- 
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Re: [MBZ] DOT4 Brake Fluid

[Gary Hurst]

3/4 and 4 is the same thing.  it's all "straight" 4


On Fri, Jan 3, 2014 at 8:17 PM, Dan Penoff  wrote:

> Yeah, but around here it's near impossible to find DOT 4 at FLAPs.  The
> only straight DOT 4 brake fluid I've found around here is made by some
> company called "Ferodo" and it's $17/liter.  You have to go to a "speed
> shop" or someplace like that for anything else.  I figure $13/quart at the
> MB dealer is about the same I would pay elsewhere
>
> Plus it comes in the cool gray plastic bottle with the pretty MB label.
>  Looks nice on the shelf.
>
> Dan
>
>
> On Jan 3, 2014, at 7:38 PM, Gary Hurst wrote:
>
> > we kinda settled the 3/4 and synthetic business so there shouldn't be any
> > confusion anymore.
> >
>
>
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>



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Re: [MBZ] DOT4 Brake Fluid

[Dan Penoff]

Yeah, but around here it's near impossible to find DOT 4 at FLAPs.  The only 
straight DOT 4 brake fluid I've found around here is made by some company 
called "Ferodo" and it's $17/liter.  You have to go to a "speed shop" or 
someplace like that for anything else.  I figure $13/quart at the MB dealer is 
about the same I would pay elsewhere

Plus it comes in the cool gray plastic bottle with the pretty MB label.  Looks 
nice on the shelf.

Dan


On Jan 3, 2014, at 7:38 PM, Gary Hurst wrote:

> we kinda settled the 3/4 and synthetic business so there shouldn't be any
> confusion anymore.
> 


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Re: [MBZ] DOT4 Brake Fluid

[Gary Hurst]

we kinda settled the 3/4 and synthetic business so there shouldn't be any
confusion anymore.



On Fri, Jan 3, 2014 at 7:20 PM, Dan Penoff  wrote:

> With the recent discussion regarding DOT 4 brake fluid, and all the
> confusion out there with the DOT 3/4 and "synthetics", I decided to just
> buy a quart of DOT 4 when I was at the dealership today.
>
> Not bad, really, when you consider it's for sure the right stuff.
>
> $13.20 for a quart.
>
> Dan
> ___
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>
> To search list archives http://www.okiebenz.com/archive/
>
> To Unsubscribe or change delivery options go to:
> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
>



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[MBZ] DOT4 Brake Fluid

[Dan Penoff]

With the recent discussion regarding DOT 4 brake fluid, and all the confusion 
out there with the DOT 3/4 and "synthetics", I decided to just buy a quart of 
DOT 4 when I was at the dealership today.

Not bad, really, when you consider it's for sure the right stuff.

$13.20 for a quart.

Dan
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