I notice it in RF2, if you come to a hairpin you can see it on the car in front some times as they turn in sharp.  Of course they actually model the brake temperature properly.   It's a little silly that this isn't in LFS, it really shouldn't be too hard to do.  
 
Hm, deja vu...  it's almost like I've had this conversation 30 times over the past 8 years....