Toymods Car Club Inc: Tech & Conversions => Join the Dots on brake fluid???

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gianttomato
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Re: Join the Dots on brake fluid???	Sat, 05 July 2003 05:43

It's to do with boiling points. All I remember is the higher the DOT number, the higher the boiling point. A little search revealed this. Dot 5 is silicone based and should NOT be mixed with DOT 3 or 4 - it can result in corrosion of the braking system. However, DOT 5.1 (like the APRacing or Motul fluid) is glycol based (like DOT 3 and 4) and so can be mixed. Of course, the best results are obtained with a complete flush as any mixing with the lower DOT fluids will lower the boiling point of the DOT 5.1 fluid. You will notice that the fluids have a dry and wet boiling point - this reflects the hygroscopic nature of brake fluids, and the effect on boiling point that adsorption of water into the fluid has. This is why it is recommended one bleeds their brakes at least yearly. The silicone based fluids have a high boiling point, are not hygroscopic and don't damage paint. The main problem is that it is quite viscous so air bubbles remain trapped in the fluid unless you pour very carefully. Apparently it is very hard to get a hard pedal. I have never used it so I don't speak from experience. [Updated on: Sat, 05 July 2003 05:52] [Report message to a moderator]

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