DOT 3 & 4 Brake Fluid? - Victory Forums - Victory Motorcycle Forum
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post #1 of 5 (permalink) Old 06-26-2014, 11:38 AM Thread Starter
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Default DOT 3 & 4 Brake Fluid?

I am planning to flush and change my brake fluid soon and I noticed that almost all the bottles of brake fluid in the auto parts store are now labeled as suitable for both DOT 3 and DOT 4.

So is it OK to use the "combination" brake fluids in our bikes?

And if I change, do I have to go to extra effort to purge all the old DOT4 only fluid before adding the new stuff?

Any info would be appreciated. Thanks.

2013 Cross Roads Classic
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post #2 of 5 (permalink) Old 06-26-2014, 11:56 AM
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Dot 3 and 4 are compatible so you don't need to worry about being extra thorough with your flush. As for the Dot3+ or 3/4 stuff that they've been selling lately, I dunno if it's really DOT4 that they're labeling that way for people who's vehicle says to use DOT3 or if it's some kind of new fluid. Personally I would use it if I had no other choice but I try to maintain a supply of quality fluids at home so I don't run into that situation. Your local bike shop should have some "real" dot4 on the shelf that you can use. There is now also DOT5.1 which is not silicon based and can be used in place of 3 or 4. I believe it's just a higher heat tolerant fluid.

Whatever you use make sure the bottle is new and sealed. Anything left open for more than a week or two I usually just chuck.

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post #3 of 5 (permalink) Old 06-27-2014, 12:24 PM
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Default brake fluids

all fluids except silicone dot 5 are compatible. dot 4 takes more heat + dot 5.1 even more. its said that the highest performance fluids need changing more often. i use ATE dot 4 in everything. 2 yrs in bikes + 5 yrs in cages is recommended changing times under normal driving
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post #4 of 5 (permalink) Old 06-27-2014, 05:53 PM
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Take a turkey baster and suck out the fluid in the master cylinder.
Now fill it with new fluid. Pump handle and hold it down open bleeder. Close bleeder and then re pump up lever and hold it down open bleeder. Keep eye on master cylinder not to run dry. You will see the color difference.
Now do the same for the rear. Never take hand off lever or pedal with bleeder open.
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post #5 of 5 (permalink) Old 06-27-2014, 06:30 PM
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Dot 3, 4, and 5.1 are glycol ether based. They are compatible, but like motor oils, you should use the recommended or higher grade fluid. Dot 4 and 5.1 also have borate ester to handle higher temperatures. DOT 3, 4, and 5.1 fluids are found in most brake and clutch systems.
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