Short answer: Just race hard.
Long answer: The brakes glow cos they're working their arses off to bring the car to a halt and getting unbelievably hot, so it's as simple as getting up to speed in whatever car you wish, then sticking it on its nose as hard as you can. But rather than do it once, try it a few times. Don't give the brakes a chance to cool down and it should be easy.
Most FIA races are a good place to look for glowing brakes, as they'll glow pretty easy in most heavy braking zones. It's a cool phenomenon, but it's not actually as uncommon as people think. Check out this week's Bathurst race which is at night. I can guarantee you you'll get glowing brakes braking down The Chase, the end of Mountain Straight, and possibly even the run down the mountain depending on how you do.
@XSquareStickIt is right about daylight possibly dulling the effect slightly, but if you're good with the effects and camera setup nine times out of ten it shouldn't be too hard.
Other things to consider:
-ABS. You won't get glowing brakes if the brakes are locked, so maybe use ABS if you aren't already.
-Tyres don't make a difference, but brake balance does if all you're after is a glowing brake shot. stick it to the front!
-Brakes typically cool down and lose their glow very quickly, so it's a good idea to get the shot while the car's still in motion. If you're after a static shot, you might still have some residual glow, but it'll be far more pronounced if the car's still in the process of stopping rather than stopped completely (Say, 50kmh or thereabouts).
Note: These pics were taken during real races, so most of the time my brake balance was 0 or even 2 to the rear. Sport tyres for the Pagani and Raptor, Racing Hards for the Nissan and Renault.
Hope this helps!