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Old 08-30-2019, 08:31 AM
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Default Brake fluid

Hey, itís been a while. So I was bleeding some hydraulic brakes and used dot 4 fluid. They arenít working super well, and I realized it says on the cap that you need dot 3. Is the reason the they arenít working? Is there really a big difference between the 3 and 4 fluid? Thanks.
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Old 08-30-2019, 10:20 AM
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Brake fluid?? Come on, man. Go karts don’t use brake fluid. We use mechanical brakes.
Well some of those fancy karts use them.

Sounds like you’ve got bigger problems than the brake fluid because there’s not enough difference between DOT 3 and 4 to write home about.
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Old 08-30-2019, 11:08 AM
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You might need to vacuum bleed them. Or just bleed them more.
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Old 08-30-2019, 02:04 PM
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Actually, this isnít for a go kart. This is for my new dirt bike. I thought I would get more help on the go kart section. Iíll re bleed them today.
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Old 08-30-2019, 03:45 PM
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What do you mean they aren't working well? Spongy feel, good feel with poor stopping, etc?

Quote:
Originally Posted by Jakebleazard75@gmail.com View Post
Actually, this isnít for a go kart. This is for my new dirt bike.
Do you mean "new" as in brand-new, or new as in "used, but new to you?"
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Old 08-30-2019, 04:38 PM
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The difference between DOT 3 and 4 is mainly boiling point of the fluid. Usually if DOT 3 is recommended but you don't have any, DOT 4 will work in its place. DOT 4 has a higher boiling point. When you go to like DOT 5 is where you can run into issues, mainly if you have ABS, DOT 5 is not compatible with ABS.

I would always look at the owner's manual and or service manual if you have one before you do any work. You really shouldn't have issues using DOT 4 in place of DOT 3. 400 degrees F for boiling on DOT 3, 450F for Dot 4.
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Old 08-30-2019, 06:19 PM
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The problem is that I have to pull the lever all the the way in just to slow down. I canít lock the tires entirely. And when I say new, itís new to me, because itís actually older than I am.
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Old 08-30-2019, 06:31 PM
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I would retry to rebleed the system and also double check the reservoir to make sure it has enough in there. Worse comes to wors take it to a shop.
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Old 08-30-2019, 07:15 PM
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^^That.
You've probably got a big air bubble in the lines.
Get a vacuum bleeder to do it more thoroughly.
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Old 08-30-2019, 08:39 PM
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Ok. Thanks guys.
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Old 08-30-2019, 10:43 PM
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It sounds like there is still air in the system. Try taking the caliper off and raising it above the master cylinder when bleeding. That's a pretty common thing to do with bike brakes.
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