I figured that might've been the case. Exhaust pipes look good.
A quick google image search (
http://bit.ly/2AIqP58) shows the middle but outside faces of the rotors glowing, even subtly after being parked for a bit. You could make a second map channel and mask in Photoshop or use a radial gradient ramp to mask a glow on the brake metal. Check my example attached, just play with the colours or the intensity for how much the rotor glows.