
Marking sensor wheel
Remove rear brake caliper.
Before removing/installing, clean the sensor bore.
Using Torx T25, remove the sensor.
Screw dial gauge holder with measuring shoe and extension, BMW No. 34 2 520, with dial gauge, BMW No. 00 2 510, firmly to the sensor mount.
Zero the dial gauge.
Measure axial runout round the entire circumference.
Using a touch-up marker, indelibly mark the point where the sensor is farthest away from the sensor ring.
Caution! If parts are replaced (rear wheel etc). and a used (and therefore marked) sensor ring is installed, the sensor ring must be measured and marked again. Remove the old mark.
Checking and adjusting sensor gap
Check/adjust at the marked point.
If necessary, remove/install sensor with Torx T25 and adjust sensor gap with shims.
Caution! After adjusting, rotate the wheel and check that the sensor is clear at all times.
Sensor gap: 0.45...0.55 mm (0.018...0.022 in)
Tightening torque: Sensor — handtight, 4 Nm