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Brake Fluid -- DOT 3-- DOT 4 ??


Guest Drake

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Guest Drake

I'm in the process of flushing my brake system. I purchased two quarts of heavy duty DOT3 brake fluid, per the service manual. My question: Has anyone used DOT4 or silicone brake fluid with any success? Thanks in advance for your comments.

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The following is from a previous discussion here about brake fluids.

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body"> A good brand of Dot 3 is all you need, but plan on changing it every two to three years...depending on the humidity in your area.

Dot 4 is synthetic but not silicon and can be used.

<span style="font-weight: bold">Dot 5 is silicon and cannot be used. The ABS valves/solenoids will airate silicon and the pump may not get proper lubrication with silicon based fluid. </span>

</div></div>

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DOT-3 is good enough, plentyful and inexpensive.

DOT-4 is better on paper but not worth the extra money if you flush your Reatta brakes every 2-4 years as you should.

Dot-4 will also absorb moisture and will also need to be replaced, so for normal driving, DOT-3 will work fine.

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