Patent ID: 8240781

Claim:
A method for operating a brake system for motor vehicles, the system having electrically triggerable hydraulic valves equipped with coils, of which at least one coil, for warming the hydraulic fluid located in the brake system, is supplied at least in some phases with a current that varies a currentless switching state of the hydraulic valve, and the warming of the hydraulic fluid is started by a supply of current to the coil in a presence of a hydraulic fluid temperature that is less than a threshold value, the method comprising warming the hydraulic fluid via a heating profile that is a function of a hydraulic fluid temperature that trips a warming phase of the hydraulic fluid, the heating profile including a first heating phase and an ensuing second heating phase, and supplying at least one coil with current during the first heating phase in such a way that a coil temperature at an end of the first heating phase corresponds to a respective predefined coil temperature value that is at least approximately maintained during the second heating phase by means of supplying current to the coil and discontinuing the warming phase of the hydraulic fluid upon detection of a pressure in the brake system that is implausible for a current mode of operation of the brake system.