The brake rubs against the tire causing it to slow down. Let's take a few minutes to brainstorm about times you have seen motion slowed down or stopped. When there is no friction, things move along with no resistance. We will use a cardboard slide and roll objects down it. Now, I will rough one side up with sandpaper and roll same objects down it.
New shoes rub blisters.
We have said that friction is caused when two material surfaces are rubbed together. Something else also happens when two materials are rubbed together. Rub your hands together. Yes, friction produces heat. Put this lotion on your hands.