Parking Brake

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NOTE: This test may set the ABS and ASC warning lights on the instrument cluster. The lights are illuminated because the system sees an implausible speed differential between the spinning rear wheels, and the stationary front wheels. Vehicles equipped with DSC3 will not set the lights.

On 735i and 745i vehicles connect BMW Diagnosis and Information System (DIS) or MoDiC. Call up "Workshop braking-in" service function and start braking-in program.

Parking brake must be tested on roller dynamometer as follows:

With parking brake released wheel circumferential force is no more than 300 N.
At the first tooth, do not allow braking force to increase.
At the 2nd tooth, braking action can begin and the indicator light may be lit.
At the 3rd, tooth, braking action must begin and the indicator light must be lit.
At the 4th tooth, braking action increases.
At the 5th tooth, wheel circumferential force must be at least 1100 N at one of the two rear wheels, and at least 1000 N at the other wheel. Wheel circumferential force differential (left to right) maximum 30% from highest value (shortly before wheel lockup). A readjustment must be carried out in event of larger deviations of wheel circumferential force. See PARKING BRAKE under ADJUSTMENTS.
Braking with locked wheels must be possible with the parking brake.
The ABS/ASC warning lights, if on, will automatically switch off by switching off engine, waiting at least 30 seconds, restart engine and drive away. Warning lights will go out when speed exceeds 8 mph. (Fault codes will be retained in memory.)