(For front as well as rear sensor) In each case of maintenance that foresees:
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replacement or refitting of the wheel;
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replacement or refitting of the phonic wheel (5) or (6);
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replacement or refitting of the brake discs;
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replacement or refitting of the speed sensor (1) or (2);
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(front) replacement or refitting of the sensor holder bracket;
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(rear) replacement or refitting of the calliper holder plate.
It is necessary to check the air-gap between the speed sensor and the phonic wheel, once the components are refitted.
For this purpose, use a feeler gauge to check the air-gap; then, carry out 4 measures of the air-gap, one every 90° of wheel
turn.
If the difference between the minimum and maximum values measured is higher than 0.40 mm, replace the phonic wheel.
Once checked that the difference is lower than or equal to 0.40 mm, carry out the shimming of the speed sensor (1) or (2)
by means of calibrated shims (B).
Phonic wheels cleaning
It is important to check that both phonic wheels (5) and (6) are always clean.
Otherwise: gently remove any possible dirt deposits with a cloth or metal brush.
Avoid using solvents, abrasives and aiming air or water jets directly on the phonic wheel (5) or (6).