The invention relates to a brake control system for a motor vehicle comprising a brake control member (1), a brake booster (4) and a brake master cylinder (5). The system of the invention further comprises a simulator (3) pneumatically coupled to the piston (42) of the brake booster (4). This simulator (3) receives at least one brake command from the brake control member (1) and is able, in exchange, to establish a pressure difference between the front chamber (40) and the rear chamber (41) of the brake booster so as to make the piston (42) move. Application: motor-vehicle brakes.