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      06-11-2014, 12:54 PM   #1
aoysgelt
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Which "performance" brake fluid is safe to be mixed with stock one?

Planning on putting better brake fluid in - but don't want to worry about old leftover fluid in ABS system or having reservoir topped off while getting service. I've read that Motul 600 and ATE Superblue don't mix - so now I am worried about compatibility what whatever I decide to put in and OEM brake fluid.

Any advice?

Thanks
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      06-12-2014, 06:53 AM   #2
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DOT 5, silicone brake fluids don't mix with any of the other standard fluids.

You can mix DOT 3, DOT 4, 4 plus, and DOT 5.1 which are all different performance specifications for the same type of stuff.
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      06-12-2014, 07:37 AM   #3
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You can mix ATE and stock, it is the Motul that is the outlier.
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      06-12-2014, 09:02 AM   #4
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After switching to race fluid (Castrol SRF), I have always had the service team flush with that fluid on services. I just let then know and make sure there is a 1L of the required fluid on the front seat. They have always been happy to oblige
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      06-12-2014, 10:16 AM   #5
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Quote:
Originally Posted by Porschefile View Post
You can mix ATE and stock, it is the Motul that is the outlier.
so how do you accomodate that switch? just a really good flush?
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      06-12-2014, 11:36 AM   #6
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Quote:
Originally Posted by 1MOREMOD View Post
so how do you accomodate that switch? just a really good flush?
Yup. If switching from stock or ATE or any other compatible fluid to motul 600/660 just suck all of the old stuff you can out of the reservoir with a turkey baster and then flush the system really well. I've personally never had any problems with whatever slight amount of incompatible fluid remains (there has to be a few drops, right?) but there are stories out there of people having brake failures from mixing a bunch of it with a bunch of non-compatible fluid. Better safe than sorry since fluids are relatively cheap (other than dang Castrol SRF).
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      06-12-2014, 12:44 PM   #7
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Is motul the issue. Was gonna go to stop techs 600 fluid, from ate.
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      06-12-2014, 12:47 PM   #8
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It isn't just motul, Castrol SRF has the same issue. I am not familiar with ST 600 fluid, but most fluids with boiling temps that high are incompatible (supposedly) with OEM fluid types.
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      06-12-2014, 01:19 PM   #9
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Quote:
Originally Posted by Porschefile View Post
It isn't just motul, Castrol SRF has the same issue. I am not familiar with ST 600 fluid, but most fluids with boiling temps that high are incompatible (supposedly) with OEM fluid types.
Looks like both St 600 and 660 are dot 4 so should be fine with ate. Motul is dot 5.1 which causes the issue I think.
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      06-12-2014, 01:31 PM   #10
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Motul RBF 600 is DOT 4.

So is the ST 600. Says so right on the front of the bottle/can. If there is incompatibility there it's because something weird is going on with the OEM fluid which is also dot 4.

My car has had two fluid flushes at dealers so I guess it's possible it may have had something else in it from the factory. But the used RBF600 I have sitting in a used iced tea jug right now mixes perfectly fine with whatever the dealer used in the same bottle. YMMV
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      06-12-2014, 01:41 PM   #11
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Quote:
Originally Posted by Richbot View Post
Motul RBF 600 is DOT 4.

So is the ST 600. Says so right on the front of the bottle/can. If there is incompatibility there it's because something weird is going on with the OEM fluid which is also dot 4.
Just saw that was looking at wrong motul. They make a dot 5.1 full synthetic also.
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      06-12-2014, 01:59 PM   #12
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Yeah, I don't know what causes the issue (or even if it is a legit thing, it has never happened to me), but there are some accounts of issues with mixing motul and other stuff:

http://www.iwsti.com/forums/gd-braki...uper-blue.html

Probably something else at work in cases like that, but why risk it?

On a side note, I've never boiled ATE and see no benefit in additional boiling point over that at least with bbk.
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      06-12-2014, 02:52 PM   #13
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I heard somebody was struck by lightning when holding up a Calloway and a Nike driver simultaneously in the middle of the fairway, please don't make the same mistake of mixing these clubs in your golf bags
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      06-12-2014, 03:28 PM   #14
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^Probably shouldn't hold up either in a lightning storm.
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      06-12-2014, 04:18 PM   #15
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hmm, but how do you flush the fluid that's in the abs system/pipes?
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      06-12-2014, 04:56 PM   #16
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Quote:
Originally Posted by Richbot View Post
I heard somebody was struck by lightning when holding up a Calloway and a Nike driver simultaneously in the middle of the fairway, please don't make the same mistake of mixing these clubs in your golf bags
So what your saying is if it's on the Internet it must be true.
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      06-13-2014, 12:09 PM   #17
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Quote:
Originally Posted by 1MOREMOD
Quote:
Originally Posted by Richbot View Post
I heard somebody was struck by lightning when holding up a Calloway and a Nike driver simultaneously in the middle of the fairway, please don't make the same mistake of mixing these clubs in your golf bags
So what your saying is if it's on the Internet it must be true.
Exactly, and because what you've just said about what is on the internet being true is on the internet, it must also be true
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      06-13-2014, 12:22 PM   #18
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Quote:
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Exactly, and because what you've just said about what is on the internet being true is on the internet, it must also be true
So I'm always right, sweet.
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      06-13-2014, 12:52 PM   #19
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http://www.lelandwest.com/brake-flui...ison-chart.cfm

everything you need is here
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      06-13-2014, 01:43 PM   #20
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Quote:
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everything?! Wow.
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      06-13-2014, 02:33 PM   #21
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everything?! Wow.
almost everything
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      06-13-2014, 02:45 PM   #22
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Quote:
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So what your saying is if it's on the Internet it must be true.
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