Quote:
Originally Posted by CSG Mike
Your shop has no idea what they're doing if they let you set foot on track in this state, without some words of warning.
Your pads looks like they are smeared (cannot tell 100% without better pictures), and your fluid is boiled.
If you're going to the track, use race pads at the track, and upgrade to a better grade DOT4 fluid. We have several options.
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Hi Mike, found this thread and has a question about your quote on the rotor appearance. How do you know that the brake fluid is boiling from these picture? Reason I asked is that I have the same front rotor appearance after just 2 track sessions on new rotors . Some additional data below,
1) Pads are Project Mu RSA01F with about 30% left, previously used on a stock rotor for about 10 track days before the rotor decides to give up and crack.
2) I am pretty hard on brakes and the front rotors are always above 610degC at track.(AP thermal paint verified)
3) Brake fluid is Motul 5.1 and I never encountered brake fluid.
4) New Raybestos blanks used for 2 track sessions and have the same appearance even complete with a similar groove near the middle of the contact patch. Old rotor had similar appearance and groove as well but I thought that was due to long usage on track.
5) Rear are Project Mu RSR02 and rotor wear is pretty much perfect. Nice shiny transfer layer. Temperature are between 430-560degC (AP thermal paint verified)
6) I leave the Project Mu pads on for street use as well but my street mileage between track sessions are low. Mileage wise probably 2:1 street:track.
So, how did you analysed that this rotor wear is attributed to fluid boiling? I will change out the fluid to Motul RBF600/660 if this is really a cause.