Abrupt full braking at Avensis

First say hello to the Toyota Forum! My father’s Toyota Avensis MY 2004 showed a surprising behavior yesterday: when the brake was lightly operated, the car performed a full braking. Key out, restart: same behavior. Towing, workshop: car back to normal. Reading the fault memory without result. Does anyone have an idea what’s going on here? Is there an electronic control unit for the brake? ABS? Does anyone have similar experiences? Actually, you can use the car like this No more driving… Greetings, Andreas.