when brakes are applied then the tyres are stopped by brake- shoe
these brake shoe are rubber grip which hold tight at the rim of tyre
when these brake show hold tight at the rim then it will apply normal force on the tyre
Due to the rough surface of rubber and rim of the tyre these two surface apply force of friction on these two surfaces
Due to this friction force it resist the motion of tyre and due to which tyre will stop.
So the main cause to stop the tyre will be FRICTION force between brake shoe and tyre rim
