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Post Info TOPIC: What about changing to Synthetic Brake Fluid
Bungy L-76


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What about changing to Synthetic Brake Fluid
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I think you mean silicone brake fluid. I think pretty much all brake fluid is synthetic. Silicone brake fluid won't damage paint. The down side to silicone is that it has been known to damage the rubber components in the brake system, particularly older vehicles. Also when burned it turns to a fine sand. If you have a leaky vacuum booster and the silicone fluid gets sucked into the engine, the sand will grind away at the cylinders. Probably a long shot, but something to keep in mind. Another disadvantage is that silicone fluid is more compressable then the other stuff and you may get a softer or mushy pedal feel.

I avoid the silicone based fluid, because I'm afraid of it damaging the rubber stuff and then causing leaks. That's my opinion anyways.



-- Edited by Bungy L-76 on Wednesday 28th of November 2012 04:00:05 PM

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jim larson


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Someone mentioned that the synthetic brake fluid would not damage paint.  So should I think about doing  that?  I am replacing my rear wheel cylinders and replacing or rebuilding master cylinder, so should I make the switch now?

Advantages/disadvantages or other things to consider?  Thanks



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Jim L

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Derek69SS


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It doesn't mix well with DOT 3/4 stuff. The entire system should be new if switching from one to another, or flush it with alcohol. (air-brake antifreeze works)

Any moisture in the system is bad news with DOT 5... instead of being absorbed and suspended with regular fluid, it separates and settles to the bottom, which can rust your wheel cylinder bores.

DOT 3 and 4 are hygroscopic and absorb moisture. DOT 5 is not, so it's not likely go get much for moisture in it as long as you don't open it up often (or on humid days).


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Derek Kiefer - Mantorville, MN

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jim larson


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Thanks for the comments.  And I did mean silicone as opposed to synthetic.  Looks like I should  put my efforts toward fixing the leak or leaks.



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Jim L

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Chris R


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Ive been running the silicone DOT 5 stuff for years. However, every single component on my car was brand new at the time before I put any brake fluid in.



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