1. A diagnostic method for a posteriori analysis of behavior of a vehicle braking system, the braking system including regenerative braking system, complementary braking system, and a distribution device configured to generate, from a global braking setpoint, a regenerative braking setpoint configured for the regenerative braking system, and a complementary braking setpoint configured for the complementary braking system, the method comprising: storing, in a non-volatile memory, at least one current braking parameter value obtained from the distribution device for a subsequent analysis based on the at least one value stored in the non-volatile memory; and detecting, via circuitry, a rapid changeover from the regenerative braking system to the complementary braking system and/or a rapid changeover from the complementary breaking system to the regenerative braking system, wherein the storing is conditional on execution of at least one event, the at least one event including detection of a rapid changeover.