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Note: Lots of people are aware that I use DOT 5 Silicone Synthetic brake fluid in all of my project cars. One thing that has been brought to my attention recently was the fact that someone had used DOT 5 brake fluid in a race car operated at high speed. This fluid tends to compress which can make it unsuitable for high speed racing applications. This is an aircraft brake fluid and does have great resistance to corrosion and high boiling point. However, it does tend to compress making the brake pedal feel mushy under certain applications. You may not notice this on the street, but at very high speed in a panic braking situation you certainly won't be happy with it's performance. It is forbidden for use in ABS braking systems and there is a warning usually on the master cylinder and owner's manual stating this fact. I use DOT 5 brake fluid in my older cars and it works great to keep the brake system rust free for 20 years, maybe more. For me that's great. But the reason AMSOIL does not market a DOT 5 brake fluid is because this fluid doesn't have wide spread use in modern autos nor is it for used in high speed applications. For that you would used the appropriate DOT 3 or DOT 4 brake fluid. Just something to clear up any misunderstandings. Also, using DOT 5 fluid, absolutely do not mix it with DOT 3! They are not compatible! You'll notice on my car projects the entire brake system is new and the DOT 5 does not ever come in contact with any DOT 3 fluid. On my Mitsubishi pickup I ran 300,000 miles without a single brake part being changed, except for disc pads and brake shoes, I flushed out the old DOT 3 fluid with the DOT 5 so the system was clean. These fluids (DOT 5 & DOT 3) are not compatible. Just in case someone wants to use DOT 5 as I do, you need to understand the application.
Art Nesmith 04-18-2008
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