Parking Brake System: Testing and Inspection

Testing Electromechanical Parking Brake on Brake Test Stand

Test Sequence

- Drive in vehicle with rear wheels on test rollers and do not switch ignition off.

• Do not turn off the ignition.

- As soon as the rollers reach a speed above 3 km/h. the "TUV mode" is activated.

- The yellow electro-mechanical parking brake symbol with a line through it appears in the instrument cluster => Owner's Manual, Instruments and Indicator Lamps

The electro-mechanical parking brake function is now:

The brakes do not close at once, but rather close a bit each time the parking brake contact switch (F321) is pressed. The brake is completely closed in 3 stages.

Pressing the parking brake contact switch (F321) releases the brakes again.

Prerequisite for "TUB mode":

- Ignition on

- Front wheels, speed greater = 0 km/h

- Rear wheels, speed min. = 3, maximum 9 km/h.

A brake test stand with a regulated wheel set must be used on AWD vehicles.