The brakes on the Porsche were actually glowing red during the Stig's lap : r/TopGear
Technical: the challenge of managing brakes during a 24-hour race | Autocar
overheated brake disk glowing red static Stock Footage Video (100% Royalty-free) 1009622885 | Shutterstock
Watch A Brake Rotor Combust From Extreme Friction
February 07, 2015 : Disc brakes glow red hot after decending the mountain for No 32 Lago Racing – Lamborghini Gallardo R-EX driven by Roger Lago / Steve Owen / Luke Youlden