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Originally Posted by we350z
I have 3 500ml liter bottles of AP Racing Forumla DOT 5.1 brake fluid laying around. It is supposed to be very good. It came with my BBK Stoptech kit for my 300ZX. I now thinking of using Motul RBF 600 full synthetic for that and the AP on the X5.
Is this fluid OK for use in the X5 OEM brake system?
It says it "mixes safely with DOT 3, DOT 4, DOT 5.1 fluids" on the back of the container. |
I use either Motul 600 or Brembo Racing fluid in the 911 and it takes a lot to get either to boil at the track. But the Motul is a DRY only fluid- intended for racing. Once any moisture gets into the system (natural humidity, or boil the fluid) the wet boiling point is pretty low. Pedal will feel spongy. Not sure I'd want to run it on the street without flushing it once or twice a year.
Looks like the AP has a pretty high wet boiling point, so that should work OK on the street.