I'm going to bleed my Juicy 7's,replacing the old fluid,wondering if anyone has tried using DOT 5,seems like it would be an improvement.
Well 5 is more than 4 so it has to be at leat a 20% improvement. Right?I'm going to bleed my Juicy 7's,replacing the old fluid,wondering if anyone has tried using DOT 5,seems like it would be an improvement.
Bingo!!! I've mixed them before in the past, mainly because I didn't have the time to flush the system. Never saw a performance loss, but still feel it's better to keep one it one or the other.No do not use DOT5. Its totally different and NOT compatibly with DOT4 or DOT5.1 systems. DOT5 fluid is silicon and something very different to DOT4 and DOT5.1 fluids. DOT5.1 is backward compatible to any DOT4 system. Though you should not really mix brake fluids, so a full drain and top up with whatever your using is best. Dont let the names confuse you, DOT5 is nothing like DOT4 or DOT5.1.
If you're using Dot 5 in a brake system that wsa designed for dot 3/4/5.1 you're most likely going to have problems with your seals/leaking as your system wasn't made for Dot 5. I don't know any MTB brakes that spec Dot 5.Dot 5 is 36% less dense which ultimately leads to a lighter oil mass, thus saving roughly 38grams per brake line.
was making a weight joke....wasn't seriousIf you're using Dot 5 in a brake system that wsa designed for dot 3/4/5.1 you're most likely going to have problems with your seals/leaking as your system wasn't made for Dot 5. I don't know any MTB brakes that spec Dot 5.
Dot 5.1 has a higher wet boiling point over Dot 3/4, etc etc basically its a lot better.
The reason a number of ABS systems may run DOT3 is because it does have a sufficiently low viscosity, as opposed to DOT4 which generally doesn't.In short, DOT3 tends to have lower boiling points with lower viscosities.
That's incorrect. Read my post for the correct information, I spent quite a while researching this and just thought I'd share for the sake of helping everyone else.dot5.1 has a higher viscosity that 4 or 3. but has a much higher boiling point.
Eh? ASTM D-445 specifies measuring these fluids at 40ºC and 100º and both at atmospheric pressure. Their viscosity (cSt) is pretty much exactly as udi mention in his earlier post. Even if a kinematic viscosity bath isn't used, a slide press or ball displacement test will still use the same "standard" temperatures of 25ºC, 40ºC and 100ºC.Your forgetting one thing, Dot3 4 and 5.1 are not tested at the same tempuratures, or pressures for there viscosity. 5.1 IS a slower moving fluid, that is why it is NOT a factory used fluid, and even though it is a glycol based fluid, it will void abs warranties. This is what i do everyday, well five days of the week, The ONLY advantage to 5.1 is boiling temp, which should be about 500 degrees.
Actually you're wrong, they are.Your forgetting one thing, Dot3 4 and 5.1 are not tested at the same tempuratures
Actually, 5.1 isn't a slower moving fluid as dictated by the actual viscosity numbers given by fluid manufacturers (which I'll take over your word thanks), and in fact manufacturers go as far as recommending the fluid for use in ABS brakes.5.1 IS a slower moving fluid, that is why it is NOT a factory used fluid, and even though it is a glycol based fluid, it will void abs warranties.
Again, you're wrong. The advantage to the DOT5.1 standard is that not only does it require a high boiling point, it requires a lower viscosity; this is what sets it apart from the DOT4 standard which only requires a high boiling point. I have said this twice now, but it doesn't seem to be sinking in so it's time for the cold hard facts.The ONLY advantage to 5.1 is boiling temp, which should be about 500 degrees.
Me too, but admitting defeat isn't much fun.Cheers for the informative post Udi, though I'd have liked to see DirtyMike come back and either admit that you may be right, or explain what he knows from his work/qualifications that goes above and beyond a few numbers that you've read...
That'll work fine.So can I use the bottle of Valvoline Synpower Synthetic Formula that I've seen at the auto parts store? I says it exceeds Dot 3 and Dot 4 but I don't bleed my brakes that much so I'm not sure. Says on the bottle, "high dry boiling point exceeds 500 deg F" and has a "minimum wet boiling point of 343 deg F". Thanks for any help