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#1092949 - 02/25/08 06:10 AM OK to mix synthetic brake fluid with regular?
Back40 Offline


Registered: 04/07/04
Posts: 212
Loc: South Carolina
Is it ok to top off reqular brake fluid with synthetic?

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#1092959 - 02/25/08 06:23 AM Re: OK to mix synthetic brake fluid with regular? [Re: Back40]
WishIhadatruck Offline


Registered: 05/09/06
Posts: 1300
Loc: Grand Rapids, MI
I believe all brake fluid is synthetic. Someone else can probably confirm that.
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#1092960 - 02/25/08 06:28 AM Re: OK to mix synthetic brake fluid with regular? [Re: WishIhadatruck]
zrxkawboy Online   content


Registered: 11/30/04
Posts: 1293
Loc: SD
 Originally Posted By: WishIhadatruck
I believe all brake fluid is synthetic. Someone else can probably confirm that.


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#1093021 - 02/25/08 08:31 AM Re: OK to mix synthetic brake fluid with regular? [Re: zrxkawboy]
VaderSS Offline


Registered: 06/10/02
Posts: 2077
Loc: Cordelia, CA
It is not Ok to mix DOT5 silicon brake fluid with any other fluid.

If you are talking about Valvoline Synpower though, it's a standard, though high quality, DOT4, all of which are synthetic, and fine to mix with most any DOT3/4 with.

That said, why are you "topping off" brake fluid? If there is a leak, you need to fix it, and if it is the disk brakes wearing, you should not top off because when you change the brakes, you'll overflow the reservoir.
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#1093070 - 02/25/08 09:39 AM Re: OK to mix synthetic brake fluid with regular? [Re: VaderSS]
Back40 Offline


Registered: 04/07/04
Posts: 212
Loc: South Carolina
Thanks for the feedback folks. 10-4 vader

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#1093238 - 02/25/08 02:55 PM Re: OK to mix synthetic brake fluid with regular? [Re: Back40]
mechtech2 Offline


Registered: 09/05/06
Posts: 19479
Loc: Chicago Area
It's good to top off low fluid. Sucking it out first is normal and good procedure when replacing pads.
But adding fresh fluid keeps air and thus moisture down in the system, and mixes fresh fluid with the old. It's a win win situation.
And all brake fluid is synthetic, like mentioned. Just watch out for the silicone based stuff.

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