This is my experience with brake fluids.
1) ATE Super Blue is maybe the most well known so I will mention it. There is also the equivalent in amber (ATE Type 200), and pretty much always has been (the idea being you can change fluids between the two and know for sure when you're done flushing the system). The blue is no longer for sale, so you just get the amber stuff. Don't quote me, but I think it is good for ~550°F dry boiling point. Why anyone would use this stuff when higher temp solutions are available is beyond me. If you're not doing anything serious with the car, just use the cheapest compatible fluid you can find. That's not going to be ATE stuff. If you are serious about brake fluid, there are way better options these days.
B) Motul RBF 600 has a ~592°F advertised dry boiling point and whatever you are reading about normal change intervals can be ignored. The higher the boiling point, the longer the change interval. This stuff was the first fluid to last racers an entire season instead of just a weekend. I've gone 8+ years on this fluid, no problem. This fluid is relatively inexpensive.
IIIa) Motul RBF 660 has a ~612°F advertised dry boiling point which really stretches the imagination when you consider the "660" in the name. This stuff is very expensive, and probably not worth it for much of anyone. I run this in the BMW right now because I wasn't aware of the better options at the time... =/
2020-05-12 Edit:
Three-bee) Endless RF-650 advertises a dry boiling point of ~613°F and is named slightly more accurately than Motul RBF 660 but not by much. It still suffers from the low wet boiling point that all the rest do (except Castrol SRF) so to me it is an also-ran. I hadn't heard of it until recently, but I figured I'd add it to the list for completeness. I have not priced it, but I'm not sure that matters since it isn't really a consideration.
Four) Torque RT700 has a 683°F advertised dry boiling point and is currently the king of the hill for dry boiling point. It costs about the same as the Motul RBF 660 and has such better properties that there is no reason to use Motul RBF 660 in my opinion. This may go in all my cars when they need fluid replacement and I fully expect one could get at least 10 years or more of useful life out of it with occasional track days in the summer.
2019-09-15 Edit:
5) Castrol SRF has a relatively low advertised dry boiling point of 590°F but employs chemistry to mitigate the effects of water to maintain an unheard-of advertised wet boiling point of ~518°F which is at least 100°F higher than the other options. This stuff is so stable, it is perfect for those looking at extended fill intervals. I'll likely fill with this over the Torque RT700 now that I've researched it.
2020-05-12 Edit:
I have referenced this post many times, and sent it to many people. I realize now it is annoying that it doesn't have the wet boiling point listed for any of the fluids.
I found a comparison chart on the Torque website with dry and wet boiling point specs for the fluids in question. It is obviously a bit biased in presentation, but the numbers check out, and if you ignore the presentation bias it clearly points to Castrol SRF as being the obvious choice.
Source: Compare Torque RT700 Racing Brake Fluid to Castrol SRF, endless RF-650 and Motul RBF600/RBF660!
1) ATE Super Blue is maybe the most well known so I will mention it. There is also the equivalent in amber (ATE Type 200), and pretty much always has been (the idea being you can change fluids between the two and know for sure when you're done flushing the system). The blue is no longer for sale, so you just get the amber stuff. Don't quote me, but I think it is good for ~550°F dry boiling point. Why anyone would use this stuff when higher temp solutions are available is beyond me. If you're not doing anything serious with the car, just use the cheapest compatible fluid you can find. That's not going to be ATE stuff. If you are serious about brake fluid, there are way better options these days.
B) Motul RBF 600 has a ~592°F advertised dry boiling point and whatever you are reading about normal change intervals can be ignored. The higher the boiling point, the longer the change interval. This stuff was the first fluid to last racers an entire season instead of just a weekend. I've gone 8+ years on this fluid, no problem. This fluid is relatively inexpensive.
IIIa) Motul RBF 660 has a ~612°F advertised dry boiling point which really stretches the imagination when you consider the "660" in the name. This stuff is very expensive, and probably not worth it for much of anyone. I run this in the BMW right now because I wasn't aware of the better options at the time... =/
2020-05-12 Edit:
Three-bee) Endless RF-650 advertises a dry boiling point of ~613°F and is named slightly more accurately than Motul RBF 660 but not by much. It still suffers from the low wet boiling point that all the rest do (except Castrol SRF) so to me it is an also-ran. I hadn't heard of it until recently, but I figured I'd add it to the list for completeness. I have not priced it, but I'm not sure that matters since it isn't really a consideration.
Four) Torque RT700 has a 683°F advertised dry boiling point and is currently the king of the hill for dry boiling point. It costs about the same as the Motul RBF 660 and has such better properties that there is no reason to use Motul RBF 660 in my opinion. This may go in all my cars when they need fluid replacement and I fully expect one could get at least 10 years or more of useful life out of it with occasional track days in the summer.
2019-09-15 Edit:
5) Castrol SRF has a relatively low advertised dry boiling point of 590°F but employs chemistry to mitigate the effects of water to maintain an unheard-of advertised wet boiling point of ~518°F which is at least 100°F higher than the other options. This stuff is so stable, it is perfect for those looking at extended fill intervals. I'll likely fill with this over the Torque RT700 now that I've researched it.
2020-05-12 Edit:
I have referenced this post many times, and sent it to many people. I realize now it is annoying that it doesn't have the wet boiling point listed for any of the fluids.
I found a comparison chart on the Torque website with dry and wet boiling point specs for the fluids in question. It is obviously a bit biased in presentation, but the numbers check out, and if you ignore the presentation bias it clearly points to Castrol SRF as being the obvious choice.
Source: Compare Torque RT700 Racing Brake Fluid to Castrol SRF, endless RF-650 and Motul RBF600/RBF660!
Last edited by BenFenner
on 2022-07-08
at 21-55-37.