roadracer Posted December 22, 2008 Report Share Posted December 22, 2008 Just a handy popular Brake Fluid Boiling Point table. Know where yours sits, and what to buy next time around. I personally recommend Motul RBF600, and to change it regularly-every 3 months for OPTIMUM performance of your brakes. The Glycol based DOT 3/4/5.1 are all hygroscopic, meaning they readily absorb moisture from the atmosphere. Silicone based DOT 5 fluids are non-hygroscopic meaning that they will not absorb or mix with water. DOT 5 is highly compressible compared to Glycol based fluids, and cannot be mixed with DOT 3, 4 or 5.1 fluids. That's not to say DOT 5 shouldn't be used, however it cannot be placed in a system which already contains a Glycol based fluid due to the already existing hygroscopic characteristics actively bringing moisture into the system, essentially pooling at the bottom causing rust, ice(cracking parts or reducing brake actuation) or steam(locking the brakes). "Wet" meaning 3% moisture absorption("Dilution"). Typically a well sealed system gains 2% dilution per year. "Dry" meaning fresh from a sealed bottle. Nitrogen gas is sometimes used(Motul) when sealing the bottle to reduce moisture contamination from contact with normal air. An opened bottle is not "Dry" brake fluid. Dry Boiling Point Order Dry Deg C/ Wet Deg C/ Product 321/ 216/ Neo-Synthetic Super DOT 610 312/ 216/ Motul RBF600 310/ 270/ Castrol SRF 310/ 210/ AP Racing 600 286/ 184/ Castrol Response, Super Dot 4 280/ 200/ ATE Superblue/TYP200 275/ 150/ AP Racing 551 265/ 185/ Motul 5.1 261/ 173/ Valvoline SynPower 230/ 155/ DOT4 205/ 140/ DOT3 Wet Boiling Point Order Wet Deg C/ Dry Deg C/ Product 270/ 310/ Castrol SRF 216/ 321/ Neo-Synthetic Super DOT 610 216/ 312/ Motul RBF600 210/ 310/ AP Racing 600 200/ 280/ ATE Superblue/TYP200 185/ 265/ Motul 5.1 184/ 286/ Castrol Response, Super Dot 4 173/ 261/ Valvoline SynPower 155/ 230/ DOT4 150/ 275/ AP Racing 551 140/ 205/ DOT3 Any corrections or additions to the list are welcome Link to comment Share on other sites More sharing options...
vtr-1000 Posted December 22, 2008 Report Share Posted December 22, 2008 thanks for that-v.interesting! Link to comment Share on other sites More sharing options...
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