A brake system (300) of a vehicle, a vehicle (400), and a control method for a brake system (300) are provided. In the brake system (300), a first control valve (130) is used to connect a first brake pipe (111) and a second brake pipe (121), so that when the first control valve (130) is in a closed state, the first brake pipe (111) is connected to the second brake pipe (121), and brake fluid in the two brake pipes (111 and 121) can flow in the two brake pipes, thereby helping improve redundancy performance of the brake system (300).