IMPORTANT: Always precision-turn both sides of both brake discs on one axle.
Maximum machining dimension per friction ring side is 0.8 mm! Observe MINIMUM BRAKE DISC THICKNESS (MIN TH).
Brake discs of M models (Compound brake discs) must not be machined! Only one brake pad set may be used up on brake discs which have been lathe-turned to minimum thickness (MIN TH).
Stationary brake disc lathe:
IMPORTANT: Only BMW-approved brake disc lathes may be used!
In the case of stationary brake disc lathes, the BRAKE DISC must be removed.
Mobile brake disc lathe:
IMPORTANT: Only BMW-approved brake disc lathes may be used!
In the case of mobile brake disc lathes, the brake calipers and brake anchor plates must be removed.
The brake discs remain on the vehicle.
After fine-grinding the brake discs, measure the THICKNESS DIFFERENCE inside the braking surfaces at 8 points with an external caliper gauge.
BMW X3 Service & Repair Manual > Steering and wheel alignment: Gauge
Gauge Minimum set: Mechanical tools AM
NOTE: (Test gauge) For measuring the drop arm
Storage Location
C5
SI number
01 06 94 (801)
Consisting of:
1. Screw
2. Rod
NOTE: (Guide rod)
3. Measuring device
NOTE: (Sensor) Deletion, only available via tool set
Gauge AM
Replaced by: 83 ...