The present invention relates to a method for determining parameters for the viscosity or temperature of a brake fluid of a vehicle which is supplied to the wheel brakes by way of a motor-and-pump assembly equipped with actuatable valves and a hydraulic unit, with which an electronic control unit is associated. To ensure a high degree of control dynamics even at low temperatures, it is suggested that the temperature of the hydraulic unit is measured by way of a temperature-sensitive element which connects the motor-and-pump assembly to the electronic control unit, and the parameters are determined by way of the temperature of the hydraulic unit.