I run a JB4, had the car go into limp mode after a couple of laps in my first session last weekend (over 100 degrees in Las Vegas). Next couple of sessions I turned on the maxcool feature on the JB4 and put the heat on full blast (was at least 120 degrees in the cabin and I have a closed face helmet lol). Didn't go into limp mode again until my 4th and 5th sessions. Both of which came after about 30 min. on track (everyone left), definitely annoying to say the least, however my oil temps looked to be at about 270. Do you think this could have been the brake safety thing? I've never heard of it.
KW V3's, Sparco Pro2000's, Vorshlag CP's, JB4, Heat Wrapped Raceland DP's, aFe stg. 2 Sealed Intake, Miro 111's, Hankook RS3's 225/245 (for now), Seibon M3 CF Hood, Turner Motorsports Alum. Radiator, Big Tom IC, BMW Performance bumper.