Determination of deceleration variable, in particular possible deceleration variable

The invention relates to a method for determining a deceleration variable of a brake system of a vehicle (10), the brake system comprising at least one brake (1) and at least one further brake, the method comprising the following steps: providing an adjustment variable quantity of an adjustment variable adjusted by the brake system, the at least one brake (1) is designed to generate a deceleration variable in response to an adjustment variable quantity of the adjustment variable; determining a braking action acting on the vehicle (10) by the braking system in response to the adjustment variable, the braking action having been applied to the braking system; determining a deceleration variable of the at least one brake (1), which corresponds to the adjustment variable quantity, in particular taking into account a vehicle parameter, said deceleration variable occurring on the basis of the adjustment variable; and determining a deceleration variable of the at least one further brake from a deceleration variable o