11-25-2008, 11:31 PM
Join Date: Feb 2006
Location: Oakland and Los Angeles, CA
Originally Posted by SouthFL
High temp fluid needs to be changed out periodically because it tends to absorb ambient moisture quicker than lesser fluids. Lower temp fluid on the other hand can go longer in cycle before it begins to absorb moisture (but it will boil under extreme "race" conditions).
This is why one must maintain a consistent bleed schedule while running high temp brake fluid here in Florida (and anywhere humid).
Valvoline Synthetic - available at your corner autoparts store is very good and readily available. It should hold up fine for a track day, and can sustain longer change cycles than Motul RBF 600 or ATE SuperBlue (amber is the same stuff). Its temp range is slightly less than the above mentioned fluids, but it's up there.
Wet(F) Dry(F) Brand
284 550 AP Racing
284 572 AP Racing 600
333 513 Valvoline Syn-Power
284 570 Wilwood
421 600* Motul RBF
392 536 ATE Super Blue
518 590 Castrol SRF*
(*)Info above from porterfield-brakes.com
For normal cars a less aggressive brake fluid is best. If the car doesn't see much hard driving, it doesn't need the high dollar brake fluids. I personally prefer Castrol LMA in normally driven cars. My RX-8 uses RBF600, but the fluid is also changed regularly.