Any difference in DOT4 brake fluids? - Chicagoland Sportbikes
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post #1 of 24 (permalink) Old 06-26-2006, 08:34 PM Thread Starter
 
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Any difference in DOT4 brake fluids?

I have a few cans of ATE (no accent on E because I'm lazy) Super Blue racing fluid unopened that are left over from my car, it's DOT4 and if my bike runs DOT4 is there any reason why they shouldn't be compatible? I guess unless bikes have specific brake fluids... I dunno.
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post #2 of 24 (permalink) Old 06-26-2006, 08:39 PM
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Not sure about that.. some of the DOT4s have higher boiling points, and shouldnt be mixed with standard DOT4.. I think I would dissassemble the calipers, and masters and clean them out really good with brakecleaner before running another type of fluid.. I was gonna switch to the Motul RBF600 since the boiling point is higher than standard dino fluid..
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post #3 of 24 (permalink) Old 06-26-2006, 08:44 PM Thread Starter
 
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Yeah I don't know what the boiling point on the fluid that's in the bike right now is at, and how much it's probably gone down since it's probably been in there a while.

Never had intentions of mixing though, but you say if I flush out the system completely I should be fine?
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post #4 of 24 (permalink) Old 06-26-2006, 08:45 PM
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yah.. as long as you take everything apart, and clean it really good, you'll be fine.. dont just drain and refill..
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post #5 of 24 (permalink) Old 06-26-2006, 09:03 PM
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use it, it's great stuff. I've been running it for several years now. I had a breakdown of boiling points somewhere and it beat out several of the big names.

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post #6 of 24 (permalink) Old 06-26-2006, 09:10 PM
Must... brake... later...
 
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I just switched to Silkolene Pro 2000 Racing Brake fluid on a racer's recommendation and tried it out at the track today-- It is hands down the best brake fluid I've used (I've tried the Super Blue ATE, Motul RF600, and stock stuff). No brake fade whatsoever even late in a 30-minute fast session. I decided to switch b/c I became really disappointed in the brake fade and mushy lever feel from Motul RF600. I'm so glad I made the change. Far more confidence and feel as I trail brake into a corner.
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post #7 of 24 (permalink) Old 06-26-2006, 09:13 PM
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U can use it just get all the old stuff out first and add that fresh.

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post #8 of 24 (permalink) Old 06-26-2006, 09:14 PM
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You can actually feel the difference from brake fluids? Wow, maybe I just don't brake that much on the SV but I just buy whatever DOT4 brake fluid I see on the shelf at the auto store (I think Valvoline Synthetic brake fluid?)

Haven't really felt anything bad, just a bit disconcerting cuz the fluid is clear and I can never tell at a quick glance how much fluid is actually in the reservour

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post #9 of 24 (permalink) Old 06-26-2006, 09:15 PM
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Quote:
Originally Posted by mikdivad
I just switched to Silkolene Pro 2000 Racing Brake fluid on a racer's recommendation and tried it out at the track today-- It is hands down the best brake fluid I've used (I've tried the Super Blue ATE, Motul RF600, and stock stuff). No brake fade whatsoever even late in a 30-minute fast session. I decided to switch b/c I became really disappointed in the brake fade and mushy lever feel from Motul RF600. I'm so glad I made the change. Far more confidence and feel as I trail brake into a corner.

Have you tried Castrol SRF brake fluid yet? It's great stuff but $75 a pint or is it a quart?

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post #10 of 24 (permalink) Old 06-26-2006, 09:15 PM
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Quote:
Originally Posted by mikdivad
I just switched to Silkolene Pro 2000 Racing Brake fluid on a racer's recommendation and tried it out at the track today-- It is hands down the best brake fluid I've used (I've tried the Super Blue ATE, Motul RF600, and stock stuff). No brake fade whatsoever even late in a 30-minute fast session. I decided to switch b/c I became really disappointed in the brake fade and mushy lever feel from Motul RF600. I'm so glad I made the change. Far more confidence and feel as I trail brake into a corner.
for the record the chances of you(jalfredp) running anywhere near as fast as David are slim to none.

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post #11 of 24 (permalink) Old 06-26-2006, 09:16 PM
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You can definitely tell the difference when the brake lever starts coming so far back in its stroke that it begins hitting your knuckles= Brake Fade.
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post #12 of 24 (permalink) Old 06-26-2006, 09:20 PM
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Never tried the Castrol stuff (but I think Ed Moor uses it b/c he has money burning through his pocket ). I would like to but at that price I'll stick with the $16 bottle of Silkolene.

VCook-- When's that Aprilia going to come out to the track?
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post #13 of 24 (permalink) Old 06-26-2006, 09:22 PM
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Quote:
Originally Posted by mikdivad
Never tried the Castrol stuff (but I think Ed Moor uses it b/c he has money burning through his pocket ). I would like to but at that price I'll stick with the $16 bottle of Silkolene.

VCook-- When's that Aprilia going to come out to the track?
never! In a couple years when I can afford 2 bikes again I'll get a track bike. This is my street ride, and since you can't find body work for the orginal Mille's hardly anymore I'd rather not crash.

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post #14 of 24 (permalink) Old 06-26-2006, 09:24 PM
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I know a guy who is selling an R6 for like $7000... great deal for a track bike, it just has some cosmetic damage from being dropped

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post #15 of 24 (permalink) Old 06-26-2006, 09:27 PM
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Quote:
Originally Posted by JonGu
I know a guy who is selling an R6 for like $7000... great deal for a track bike, it just has some cosmetic damage from being dropped
oh only dropped, sign me up!!

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post #16 of 24 (permalink) Old 06-26-2006, 09:31 PM
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Whats the difference between 4 an 5.1?
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post #17 of 24 (permalink) Old 06-26-2006, 09:32 PM
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1.1?

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post #18 of 24 (permalink) Old 06-26-2006, 09:34 PM
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I use DOT5 synthetic brake fluid on my bike. White\yellow color.
Works fine, but I drive only on street - no race track.
I replace my brake fluid every year,
mighty vac makes that work for me.

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post #19 of 24 (permalink) Old 06-26-2006, 09:35 PM
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kidding

Quote:
Historically, DOT 5-level performance (specifically boiling points and viscosity) could only be achieved with silicone-based fluids. However, modern compounding has created glycol ether-based fluids which now meet DOT 5 bogeys in these key areas. Consequently, the DOT 5.1 moniker was created to differentiate between these two very different chemistries which both meet DOT 5 performance requirements.

In so many words, DOT 5.1 fluids are simply DOT 4-type fluids which meet DOT 5 performance requirements. Because of this, they typically can be mixed with DOT 3 or DOT 4 fluids without concern. In some circles, they are even referred to as ‘DOT 4 Plus’ or ‘Super DOT 4’ fluids because they are more similar to a conventional DOT 4 fluid by chemistry than they are to a conventional DOT 5 fluid. In fact, DOT 5.1 is essentially comprised of Borate Esters.

While it may not be obvious, the big advantage of the DOT 5.1 fluids is that they contain all of the nifty water-absorbing characteristics of the DOT 3 and DOT 4 fluids while simultaneously providing for very high boiling points and relatively stable viscosity over a wide range of temperatures. The best of all worlds, you could say. The table below sums it up quite nicely.

PROPERTY DOT 4 DOT 5 DOT 5.1
Dry BP (F)@ 0.0% H2O 446 509 509
Wet BP (F)@ 3.7% H2O 311 356 356
Chemical Composition Glycol Ether / Borate Ester Silicone Based Glycol Ether / Borate Ester

(As stated earlier, the table data above contains the minimum properties for a fluid to be called a certain type. For example there are many racing brake fluids with Dry BP performance at or above 590o F and Wet BP at or above 390o F.)

So, what is the downside of the DOT 5.1 fluids? Like most things in life, the good stuff isn’t cheap. DOT 5.1 fluids typically cost three to four times as much to manufacture as a conventional DOT 4 fluids. There’s always a catch…
Source

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post #20 of 24 (permalink) Old 06-26-2006, 09:37 PM
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Quote:
Originally Posted by c2000
I use DOT5 synthetic brake fluid on my bike. White\yellow color.
Works fine, but I drive only on street - no race track.
I replace my brake fluid every year,
mighty vac makes that work for me.
the problem with 5 is that to properly use it you should purge the entire system of your old 3/4/5.1 as they are not compatible. FULL PURGE.

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post #21 of 24 (permalink) Old 06-26-2006, 09:51 PM
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I change my fluid 3 times since last season.
The guy who sold me his bike, never changed brake fluid.
Bike was already 6 years old, and fluid was almost black,
I don't know how that stuff even worked.
First time after change, brake fluid got dirty after month of usage.,
so I did it again, drove for 2k, changed it again.
So beginning of this season I did it again, and so far looks like brand new.
I think now my system is clean, and free of that old crap.
For now I will stick with DOT5 .

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post #22 of 24 (permalink) Old 06-27-2006, 07:46 PM
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Quote:
Originally Posted by mikdivad
Never tried the Castrol stuff (but I think Ed Moor uses it b/c he has money burning through his pocket ). I would like to but at that price I'll stick with the $16 bottle of Silkolene.

VCook-- When's that Aprilia going to come out to the track?

We'll meet up one day and I'll bring the bottle. They recommend cleaning out all the old brake fluid first.

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post #23 of 24 (permalink) Old 06-27-2006, 09:04 PM
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Quote:
Originally Posted by JRSMAIL
We'll meet up one day and I'll bring the bottle. They recommend cleaning out all the old brake fluid first.
Sure thing! If you've got the stuff I'd love to try it out.
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post #24 of 24 (permalink) Old 06-28-2006, 06:45 PM
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I have had great luck with Motul RF600. I do bleed my fronts prior to every trackday. The SFK stuff is considered the best also in places like Champ Car, but, having tried both, I see no difference at my braking level.
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