I have a few extra cases of Castrol SRF. It is absolutely the BEST brake fluid you can buy with by far the highest wet boiling point of 500 degrees F. It is used exclusively by NASCAR and will not boil on you at a track day. It is ok to use on street cars as long as you replace your brake fluid every 18 months. Retails for $80 per liter. I have them for sale at $55 per liter. Call or email me to order.

Danny Chan
Garage1 Automotive
415-864-6660

GarageAutomotive@aol.com

 

Danny

I am currently useing Motul, I know the wet temps are higher with SRF however how hydroscopic is the Castrol. Could I get away with out bleeding the system . I run 15-20 Track days a year

 

Hi Jack, the Castrol is very hydroscopic. If you're running that many track days a year, its always best to bleed your brakes often regardless. But even so, under the same conditions, after the Castrol collects moisture, the wet boiling point will still be 100 degrees over the Motul. At $55 per liter, the price isn't that much higher than the Motul which is sold in half liter bottles.

 

From what I understand, Castrol SRF is LESS hyGRoscopic than any of the other brake fluids out there. This is why most folks who switch to Castrol SRF only change their fluid once per year, since Castrol SRF's wet boiling point is so high compared with other wet boiling points (Motul RB 600F is second highest). For those who don't know--wet boiling point is the brake fluid's boilover point AFTER the fluid's hyGRoscopic nature has absorbed water from the air.

FWIW, Motul RB 600F is damned good stuff for the money.

As for the frequency of changing fluid. It really depends on how hard you are on the brakes (and thus the fluid). If you are easy on the brakes and you don't cook them, you probably can get away with changing the fluid twice to three times per season. If you run Hawk Blues and are HARD on the binders, you probably do cook the fluid (RB 600F color goes from light yellow to dark brown), then it's best to change to fresh fluid prior to your next open track event.

If you're into competitive sprint racing, I'd probably change the fluid before each big race weekend...

 

Ford heavy duty DOT 3 brake fluid.
Has higher boil temp than off the shelf DOT 4, it is good up to 485 F

it is also 2 dollars a bottle candian at my local ford dealership. and they give me 15% discount for prucahess of 3 or more