When the parking brake is engaged, both thrust pieces are moved outwards against the brake shoes. When it is released, the thrust
pieces move inwards towards each other. When the parking brake is released, the brake shoes centralise themselves automatically
thanks to their floating bearing arrangement in the area of the adjustment mechanism. To determine the exact position of the
thrust pieces, the rotational movement of the electric motor is determined by an internal sensor. Two separate wires transmit the
sensor signal to ABS control unit J104 and two additional wires are used to activate the electric motor.
Operation and driver information
Engaging the parking brake
On the Audi e-tron GT, the parking brake is again activated by the electromechanical parking brake button E538 in the centre con-
sole. As on all Audi models, the activated electromechanical parking brake is indicated by a parking brake symbol on the display.
Transmission position P (parking lock) is activated automatically when the parking brake is engaged with the vehicle stationary.
The parking brake can be activated at speeds < approx. 2 km/h. In this case, the vehicle is brought to a standstill by the parking
brake, and the parking lock is then only activated when the vehicle is stationary.
Releasing the parking brake
The parking brake is automatically released when the drive system is activated (transmission position D or R selected) and the ac-
celerator pedal is pressed. For this to happen, the driver's door must be closed and the driver's seat belt must be buckled. If the
vehicle is on a gradient of more than five degrees, it only moves off when the drive torque is sufficient to prevent the vehicle from
rolling back in the other direction.
Engaging and disengaging independently of the parking lock
The parking brake can also be manually engaged and disengaged independently of the parking lock when the vehicle is stationary
via a setting in the MMI.
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Emergency braking function
As on other Audi models, the electromechanical parking brake on the Audi e-tron GT can also be used for emergency braking in
dangerous situations. The vehicle must be travelling at a speed of > approx. 3.5 km/h to do this. The button must remain pressed
for the intended duration of the braking procedure and the accelerator pedal must not be pressed. An additional acoustic warning
signal is activated for the duration of the braking procedure.
Engaging manually
The condition for the functions described is that there is at least one valid wheel speed signal per axle. If this condition is not met,
the parking brake can still be engaged to park the vehicle. To do this, the switch must be operated for longer than 10 seconds with
terminal 15 switched off.
Additional functions
Automatic re-tensioning
To ensure that a defined retaining force is provided, the system is re-tensioned on parked vehicles after they have been stationary
for a specified period.
Automatic detection of brake test dynamometer
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