Two Piece Brake Discs

[BenW]

Dot5.1 fluid is fine, it's the dot5 that's bad for the car. Only real problem with dot5.1 is that you need to change it yearly instead of 4 yearly.

 

[Ed...]

i thought it was the other way round as 1 is designed for motorbikes?

 

[RalphyBMW]

No, no problem with using Dot5.1 in cars, dot5 can be problematic.

 

[Foxspeed]

in a nutshell dot 5 is silcone based

all the others are fine in brake systems

dry and wet boiling points

DOT 3 205 °C (401 °F) 140 °C (284 °F)
DOT 4 230 °C (446 °F) 155 °C (311 °F)
DOT 5 260 °C (500 °F) 180 °C (356 °F)
DOT 5.1 270 °C (518 °F) 190 °C (374 °F)

 

[BenW]

Take the ratings with a pinch of salt though, plenty of dot4 fluids that exceed the temperature rating of dot5.1 fluid

 

[Ed...]

Those dbp a wbp figures can change dramatically innthe quality of fluid though cant they si? I put dot 4 castrol srf in my last change and it out performs any dot 5.1 by a long way. Dbp of nearly 600 dc

 

[Ed...]

Beat me to it ben

 

[Foxspeed]

Take the ratings with a pinch of salt though, plenty of dot4 fluids that exceed the temperature rating of dot5.1 fluid

its all approximates

got 5.1 in mine as when i started to do the brakes its what i had in the garage