SRF. Is it worth it?

[Fett]

Decided to change my brake fluid over christmas ready for a few trackdays next year. Was wondering if anybody had used the Castrol SRF and if it was actually worth the extra expense or just stick with the likes of Motul RBF 600? What do most use for track and was it any good?

Also, how much will I need? I'm guessing about 1L and a half, with another half to flush.

Thanks in advance.

[anonymous-user]

If you are going to be trackdaying the car then srf is the stuff to go for, we used it in our 996 racecar this season and never had any issues with brakefade or boiling of the fluid.

[mrdemon]

not worth it imo

you can change your fluid 5 x for the price of that stuff with some good AP stuff.

[Fett]

This is what I was thinking. I know it's meant to be the dogs danglies, but was thinking regular changes with the RBF would be just as good. Think I will just go with the RBF in this case.

Thanks both for the replies.

[Jim O.]

I'd say that if you were an experienced, skilled driver, able to keep the car at the car's 10/10ths, then SRF is a good choice. But for the rest of us, there are other fluids that will work very well, and cost quite a bit less. The main requirement for these other fluids is to change them regularly - at least every 6-12 months for street use, maybe even before each track day depending on your driving style and the track.

Always use fluid out of a freshly-opened container when you do your brake fluid flush. I usually mark the container with the date it was opened, and throw it out after a few months. Most of the time, I use a full liter of fluid when I do a fluid flush.

When it's time to flush the brake fluid, you might want to change the clutch fluid, too...

[daddysumo]

Hmmm 30k + cars versus £30 brake fluid ?
Get excited on track and brake tooooo late foe a hairpin and need those already hot calipers and fuid to perform, what fluid would you rather have at that exact moment ?
Standard new fluid in my car gave me no brakes at all on one trackday, I always use premium stuff now and change it before every track day, it is worth it IMO.

Steve

[Fett]

daddysumo said:

Hmmm 30k + cars versus £30 brake fluid ?
Steve

Fair point. But RBF is a premium brake fluid, it actually has a higher dry boiling point than SRF, althought it's wet BP is a fair bit lower. So with this in mind was thinking regular changes with RBF would be just as good as it would be changed more often.

Edited by Fett on Friday 18th December 14:57

[daddysumo]

Fett said:

daddysumo said:

Hmmm 30k + cars versus £30 brake fluid ?
Steve

Fair point. But RBF is a premium brake fluid, it actually has a higher dry boiling point than SRF, althought it's wet BP is a fair bit lower. So with this in mind was thinking regular changes with RBF would be just as good as it would be changed more often.

Edited by Fett on Friday 18th December 14:57

I agree but its easy to say that it will get changed regularly but in practice some might think.. oh it will be ok... was only changed back in.... and then maybe regret not doing it !
RBF as you say, is a premium fluid though so no worries there. It's those who only have standard fluid in their cars like I did, that I was more trying to get my point over to, as they will deffo have brake fade if they go on the track without changing it and brake consistently hard.

Steve