The invention discloses a vehicle braking assembly, a vehicle braking system and a vehicle. The vehicle braking assembly comprises a braking disc, a braking pincer support, a friction pad, a first piston and a second piston. A containing groove for containing the braking disc is arranged in the braking pincer support. The containing groove is provided with a rotating-in opening for rotating the braking disc into the containing groove, and a rotating-out opening for rotating the braking disc out of the containing groove. The second piston is close to the rotating-out opening relative to the first piston. The cylinder diameter of a piston cylinder of the second piston is larger than that of a piston cylinder of the first piston. According to the vehicle braking assembly, the differential value between kinetic friction force, between the rotating-out opening and the braking, of the friction pad and the kinetic friction force, between the rotating-in opening and the braking disc, of the friction pad is smaller, eccentric abrasion between the friction pad and the braking disc at the rotating-in opening is further avoided, and braking reliability of the vehicle braking system to the vehicle is improved.