Skylarking
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Temperature of the rotors get much hotter than the calliper body itself.Skylarking, it was a long time ago and discs are nothing like as good as they are now but an E Type Jags on that road in Italy whos name escapes me had the temperature of their discs get up to 1000 degrees fahrenheit.
EBC sells rotor marking paint so one can visualise what temps their rotors (and pads) get to. It’s listed in the link I provided above.
The rotor paints supplied are:
#1 – 800°F/430°C
#2 – 1000°F/540°C
#3 – 1200°F/650°C
Paint all three separately in lines on your disc/rotor edge.
Mille Miglia was a punishing race for the times and would give the brakes a workout like many tracks would…
As @Immortality says, calliper paint must cope with brake fluid not just heat… so there is that
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