DOT 4 and DOT 5 brake fluid mixed, what to do? - Yellow Bullet Forums

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Old 04-08-2013, 10:02 AM   #1
kamkuda
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Angry DOT 4 and DOT 5 brake fluid mixed, what to do?

It looks like the brake fluid was mixed and the fluid is cloudy.

SHould I switch to DOT 4 or DOT 5

Can I just bleed it out?
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Old 04-08-2013, 10:18 AM   #2
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Default Re: DOT 4 and DOT 5 brake fluid mixed, what to do?

I think you can mix 3 and 4, dot 5 is silicone, so drain it all out, flush it with new stuff.
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Old 04-08-2013, 10:43 AM   #3
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Default Re: DOT 4 and DOT 5 brake fluid mixed, what to do?

I understand that they do not mix

The benefit of the dot 5 is the boiling point but I wrecked some paint on a car and the silicone doesnt affect paint.
Its expensive and I have been puking out a bunch trying to bleed it ou

I was think of draining and just switch back to the Dot 4

Also I heard the combo of the 2 may degrade the seals
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Old 04-08-2013, 11:26 AM   #4
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Default Re: DOT 4 and DOT 5 brake fluid mixed, what to do?

Drain and flush.
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Old 04-08-2013, 11:37 AM   #5
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Default Re: DOT 4 and DOT 5 brake fluid mixed, what to do?

Drain it all out and start over, a mighty vac or something similar will make for a speedy process. I would suck all the existing fluid out from all the calipers, refill it with the new fluid of your choice and flush that out too, then refill it and bleed the brakes.

DOT 3, 4 and 5.1 will mix and the Dot 5 is silicone based and should never be mixed with any of the others.

I personally don't like the DOT 5 silicone stuff because of the pedal feel, I'd use either Dot 4 or 5.1.

http://www.advancepetro.com/differentbrakefluid.htm

http://www.opieoils.co.uk/pdfs/tech-...-Explained.pdf

http://www.afcoracing.com/tech_pages/fluid.shtml
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Last edited by Paulie9fingers; 04-08-2013 at 11:38 AM.
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Old 04-08-2013, 11:49 AM   #6
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Default Re: DOT 4 and DOT 5 brake fluid mixed, what to do?

Yup, drain and flush with the fluid you want to use.
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Old 04-08-2013, 12:01 PM   #7
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Default Re: DOT 4 and DOT 5 brake fluid mixed, what to do?

Silicones are insoluble in about everything. It will be hard to remove all the residue, and you must do so for good brake performance.
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Old 04-08-2013, 12:08 PM   #8
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Default Re: DOT 4 and DOT 5 brake fluid mixed, what to do?

You can flush the system with denatured alchohol.....
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Old 04-08-2013, 01:11 PM   #9
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Default Re: DOT 4 and DOT 5 brake fluid mixed, what to do?

Flush it all out. Use dot 5.1. Compatible with dot 4
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Old 04-08-2013, 07:34 PM   #10
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Default Re: DOT 4 and DOT 5 brake fluid mixed, what to do?

OMG No! Don't just flush the system. If you truly had DOT 4 and DOT 5 fluids mixed you have a real mess and a potential safety issue on your hands. You need to rebuild all the calipers, the master cylinder and anything else that has seals in it. DOT 4 and DOT 5 fluids are dramatically different in materials and are not compatible in any way. the 2 types will create a "sludge" in the lines, calipers, MC and everywhere else.

The process should be to remove the calipers, MC, ABS pump/unit (and if a manual transmission using brake fluid as the hydraulic fluid) the clutch slave cylinder and anything else with seals associated. You will need to rebuild all these components with new, fresh seals. For the lines, at the bare minimum blow them out several times with denatured alcohol, then reassemble the system.

Other than the fact DOT 5 will not harm paint there is nothing (IMHO) positive about it. It's highly compressible (can be as much as 19% dissolved air - SAE J1705 Appendix 2.2. doesn't swell or lubricate the EPDM seals very well and is NOT hygroscopic.

Good luck with cleaning the mess out...
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Old 04-08-2013, 08:46 PM   #11
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Default Re: DOT 4 and DOT 5 brake fluid mixed, what to do?

^ what he said, you need to clean it out not just flush it.
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Old 04-08-2013, 08:50 PM   #12
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Default Re: DOT 4 and DOT 5 brake fluid mixed, what to do?

Just put a chute on and remove the brakes.. no one ever made a record pass with a good set of brakes!! Think about that!!
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Old 04-08-2013, 08:55 PM   #13
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Default Re: DOT 4 and DOT 5 brake fluid mixed, what to do?

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Just put a chute on and remove the brakes.. no one ever made a record pass with a good set of brakes!! Think about that!!
YOU first......
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Old 04-08-2013, 08:57 PM   #14
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Default Re: DOT 4 and DOT 5 brake fluid mixed, what to do?

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YOU first......
DONE!!

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Old 04-08-2013, 08:59 PM   #15
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Default Re: DOT 4 and DOT 5 brake fluid mixed, what to do?

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DONE!!

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