Method for monitoring a hydro-electrical brake system

A Method of monitoring an electrohydraulic brake system for motor vehicle, having a master brake cylinder (2) operable by a brake pedal (1), a travel simulator (3) cooperating with the brake pedal (1), at least one pressure source actuatable by an electronic regulation and control unit (16) which is formed of a high-pressure accumulator (21) that can be charged by means of a pump (23), and the pressure of the pump can be applied to wheel brakes (7, 8) of the vehicle which are connectable to the master brake cylinder (2), on the other hand, by means of at least one hydraulic connection (5) that can be closed by means of a separating valve (11), with a device (33) for detecting the driver's deceleration request, and with each one inlet valve (17, 18 connected upstream of the wheel brakes (7, 8) and an outlet valve (27, 28), the method comprising:

• deactivating an electronic control associated with a charging operation of a high-pressure accumulator and carried out by an electronic regulation and control unit;
• closing a separating valve associated with a vehicle axle,
• opening inlet valves associated with the vehicle axle for the purpose of displacing pressure fluid volume into wheel brakes of the vehicle axle, while determining values representative of a hydraulic pressure introduced into the wheel brakes and a displacement of pressure fluid volume;
• and
• evaluating the values to judge the condition of the wheel brakes.