mixing fluids
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Elder User
Joined: Feb 2004
Posts: 830
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From: Indiana
mixing fluids
Is it okay to mix a synthetic brake fluid with a non synthetic fluid?
I helped my nephew fix a brake problem and we tried to flush out all the old fluid with new. I thought about useing synthetic fluid but didn't know if you could mix it and not encounter problems later.
I helped my nephew fix a brake problem and we tried to flush out all the old fluid with new. I thought about useing synthetic fluid but didn't know if you could mix it and not encounter problems later.
Lead Driver
Joined: Jul 2005
Posts: 5,967
Likes: 7
From: Eccles, WV
Really, you should not mix it, but if you did a complete flush, you should not have any problems unless the system is very old and worn. Synthetic will pass by worn seals, especially the seals in the antilock system. I had that happen in my VIC and could not figure out what was wrong. Even the stealership could not find this as it would not set a code. It antilock motor was bypassing very slow and it was causing the rear wheels to lock under a hard stop. Yes, I run the VIC. It is not Grandpa's car with a 4.6. The 373 (stroked 5.8) runs that big boat just fine.
The only true way to flush it is with a power flush. It takes a lot of time and a lot of fluid and you cannot really be sure that you got all of the old fluid out of the calipers and cylinders. I ended up doing a complete rebuild. I needed an excuse to upgrade the brakes anyway. Now it will set your eyeballs on the windshield if you jump on them.
My question is 'Why did you go to synthetic?'
The only true way to flush it is with a power flush. It takes a lot of time and a lot of fluid and you cannot really be sure that you got all of the old fluid out of the calipers and cylinders. I ended up doing a complete rebuild. I needed an excuse to upgrade the brakes anyway. Now it will set your eyeballs on the windshield if you jump on them.
My question is 'Why did you go to synthetic?'
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Elder User
Joined: Feb 2004
Posts: 830
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From: Indiana
I didn't use the synthetic. I've heard a lot of good things about synthetic oils but didn't know anything about brake fluid. I just stuck with the non synthetic brake fluid just to be on the safe side. Now I'm glad I did.
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