Breaking In Duo-Servo Parking Brake

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2006 BMW X5, 2005 BMW X5, 2004 BMW X5, 2003 BMW X5, and 2002 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.

The following breaking in procedures are applicable in case of insufficient braking effect or after replacing brake discs and/or brake shoes.

WARNING: Use only brake dynamometers whose test speed is 3 mph (5 km/h) or less. Follow without fail the guidelines contained in the operating instructions of the relevant test stand manufacturer. Failure to do so may result in damage to the vehicle and the system and also personal injury.

CAUTION: The maximum test duration for four-wheel drive vehicles is 3 minutes per axle. If the test has to be repeated, the vehicle must be driven over a distance of at least .6 miles (1 km) to ensure the transfer case is sufficiently lubricated.

Check tires for damage. Check tire treads. Check tire pressures.

NOTE: On cars equipped with ASC+T or DSC, the system must be deactivated with the switch. ASC+T/DSC indicator lamp in instrument cluster must light up.

The brakes must be at normal operating temperature. To achieve this, brake the car several times to slightly warm and dry brake discs and drums.

On roller dynamometer, actuate parking brake lever until the wheel circumferential force on both wheels is at least 800 N. Release lever after approximately 40 seconds.

NOTE: Do not do this procedure if parking brake cables are not adjusted uniformly.

When driving on road (where possible on private property or quiet road), at approximately 40 km/h, apply parking brake lever until braking action can be felt. Pull up lever into next catch and drive on for approximately 400 m.
Repeat breaking in procedure if necessary. Allow brakes to cool down sufficiently.