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Old Jul 11th, 2008, 10:02 pm   #1 (permalink)
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DOT3 vs DOT4 brake fluid?

My bike mentions to use DOT4 brake fluid for the clutch and brakes etc...

At home however, we just have Castrol DOT3 brake fluid.
Is it ok to use that?

Bike is a 2000 748
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Old Mar 4th, 2009, 2:41 am   #2 (permalink)
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DOT inticates fluids boiling temperature. The higher DOT is the higher is boiling pemperature. If you are not racing with your bike dot 3 should be enough.
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Old Mar 26th, 2009, 10:57 pm   #3 (permalink)
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just came across this.

there is more to the dot rating than boiling point.

do not use dot 5!!! dot 5 is silicone based and is not compatable. dot 3 and 4 are compatable.
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Old May 1st, 2009, 5:04 am   #4 (permalink)
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I think there is a viscosity difference in the Dot 3-4 also.
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Old May 26th, 2009, 5:29 pm   #5 (permalink)
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Suuuper Blue

I am using ATE Blue Racing Fluid, DOT4. I like it because it is blue.
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Old May 27th, 2009, 1:42 pm   #6 (permalink)
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You can also use DOT 5.1. Same as 3 or 4, but with higher boiling point, and better moisture protection. I got mine at Desmotimes.
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Old May 28th, 2009, 3:50 pm   #7 (permalink)
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i thought mine said use either 3 or 5 fluid. i always put in 3! looking online it does say 5 is silicone based and does not mix. so if this is correct and my bike does say that then you would have to completely drain the 3 and use 5. bike is away at my pops awaiting my stator rebuild or i would go check for sure
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Old May 28th, 2009, 6:19 pm   #8 (permalink)
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"DOT 3-5 Fluids"

You're right sebastian. Here's how Brembo explains the MC reservoir marking in their Technical Notes:

Yes, we know the cap on the rectangular master cylinders says “DOT 3—5 Fluids”-BUT PLEASE NOTE: Silicone DOT 5 fluids are NOT generally in use in Europe, but Glycol-based “DOT 5.1” fluids ARE. Hence, the “DOT 5” cap designation.
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Old Jun 20th, 2009, 10:34 am   #9 (permalink)
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Allow me to chime in on this. We have had this debatew going on in the antique and collector car world for some time.

I would recommend DOT 5 silicone only on vehicles that spend "most" of their life in static display. Its resistance to moisture wicking is almost nil. Even then i would only use it after a thorough flushing 3-4 run complete system bleedings. Personally if cost permits i replace all the components of the system.

Ive used DOT 5 silicone for years on opne of my cars that sits for most of its life and hits the race track 3-4 times a year with no events.
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Old Oct 1st, 2009, 1:41 pm   #10 (permalink)
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my ducati dealer told me only dot 4 for my 999
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