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Old 03-05-2003, 10:36 AM
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Post What kind of brake fluid won't hurt paint?

And where can i get it at? Will it hurt to flush my brake system out with it?


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Old 03-05-2003, 10:43 AM
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Silicone...available at any good auto parts shop. It won't hurt your system at all but you do need to flush all the old fluid out. It's biggest benefit is that it won't absorb water like OEM brake fluid will and it'll last longer because of that. Cost's a bit more though.

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Old 03-05-2003, 10:54 AM
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how do you flush it out? I think my master cylinder cap says only dot 3. Will it hurt?
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Old 03-06-2003, 09:52 PM
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You must disassemble every brake component and wash with alchohol before running silicone, mixing the two results in a gel...not good. Also switching to silicone usually gets you a spongy pedal in systems designed for DOT3 due to it's greater compressability.

I would recommend not switching.
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Old 09-21-2005, 08:33 AM
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You don't have to take the system apart to "wash" it out. Open the bleeders and start pumping! Keep the MC full of alcohol until the system is flushed. I usually flush one end (front or back) at a time. MAKE SURE you have pure alcohol coming out -- refill the reservoir at least twice, and three times won't hurt. If you have traces of the old brake fluid in the lines, calipers, or wheel cylinders the silicone will gell when it mixes and clog a line, causing a wheel to stick. The slightest amount will do it! You can run the silicone fluid in a DOT 3 system, just don't forget to use silicone only!!

I've flushed brakes several times using the above method with no problems. I usually refill the MC twice, then go back and flush half a reservoir of alcohol through each brake separately, just about like bleeding brakes, just to make sure noting was left in a line. Sometimes if a line has a partial blockage, but not enough to notice, or one short and one long line (like a T feeding front brakes -- the one nearest the MC has a shorter line), the line with the least resistance gets most of the alky flushed through. By going back the final time and flushing each wheel I make sure every line is clear.

Unless your car sits a lot between drives silicone just isn't worth the trouble. Regular brake fluid won't hurt paint as long as it's washed/wiped off immediately. If you want to paint the MC it's a problem because some will seep under the cap seal, but that's about all. A powder coated MC would fix that, but you need to take all seals out before having it powder coated. If it's a brand new MC an epoxy paint, with 24 hours cure time before use, should hold up. Make SURE the MC is THOROUGHLY CLEANED before painting or powder coating. Clean real good with paint thinner or mineral spirits.
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Old 09-24-2005, 07:44 AM
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silicone fluid

I did a google search on brake fluids last year, read many articles relating to fluid accumulation in the rotors over time with silicone fluid. That can lead to sudden fade. I think the shine is wearing off DOT5, many are returning to time tested DOT3 or 4. Bill
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Old 09-24-2005, 08:14 AM
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As a FWIW, I read on another site that Castrol SRF (DOT 4 & a pricey racing fluid) resists moisture very well is available from Ford Mo.Co. as their part #C6AZ-19542-AA. Ford apparently uses this fluid in HD truck applications & buys it in bulk so their price is better. I haven't confirmed the accuracy of the price or part number.
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