Automatic release device and method for automatic parking brake at start

The invention relates to a method and an automatic release device of the automatic parking brake at startup. According to the invention, a torque estimation threshold value transmitted (ECT_seuil) is determined that balances the motion of the vehicle. Then, when starting a loop for calculating the transmitted torque estimation (ECT) is performed until the calculated value (ECT) does not exceed the threshold value (ECT_seuil). Once the threshold is exceeded, a looseness about the Automatic Parking Brake is produced.