Marking sensor ring
Take load off front wheel/lift clear of ground.
Undo clamp screw at left fork tube.
Attach dial gauge holder (1), BMW No. 00 2 500, with dial gauge, BMW No. 00 2 510, and measuring shoe (2), BMW No. 34 2 510, to fork slider tube.
Zero the dial gauge.
Measure axial runout right round the sensor ring.
Using a touch-up marker, indelibly mark the point where the sensor is farthest away from the sensor ring (arrow).
Caution! If parts are replaced (brake disc etc). and a used (and therefore marked) sensor ring is installed, the sensor ring must be measured and marked again. Remove the old mark.
Retighten clamp screw of left fork tube.
Check/adjust ABS sensor gap.
Tightening torque: Clamp screw, quick-release axle — 22 Nm
Checking and adjusting sensor gap
Check/adjust at the marked point with ABS feeler gauge.
If necessary, remove/install sensor with Torx T25 and adjust sensor gap with shims.
Sensor gap: 0.45...0.55 mm (0.018...0.022 in)
Caution! After adjusting, rotate the wheel and check that the sensor is clear at all points.
Tightening torque: ABS sensor mount — handtight, 4 Nm