When you overheat your brakes your brake pads may crack and also your brake rotors may also warp if they get too overheated.
Overheating your brakes is never really a good thing so you should avoid doing anything to overheat your brakes if possible.
Avoid riding your brakes too much especially when going downhill or avoid keeping your foot on the brake even when riding around town.
Sometimes you may have your brake pedal depressed just enough to wear out and heat up your brakes even though you're moving down the road.
Overheated brakes can cause warped brake rotors, cracked brake rotors, cracked brake pads and cracked brake shoes.
Your brake fluid also usually heats up when you overheat your brakes and when that happens the water boils into steam which causes the brake fluid to not be as effective.