Suzuki GSF1250 Service Manual page 537

Step
3 1) Inspect both wheel speed sensor rotors for damage and
check that no foreign objects are caught in the rotor
openings.
Are the rotors OK?
4 1) Inspect the clearances of the front and rear wheel speed
sensor – sensor rotor using the thickness gauge.
Special tool
(A): 09900–20803 (Thickness gauge)
(B): 09900–20806 (Thickness gauge)
Wheel speed sensor – sensor rotor clearance
0.3 – 1.5 mm (0.012 – 0.059 in)
(A), (B)
Are the clearances OK?
Action
I718H1450064-01
Front
(A), (B)
I718H1450025-01
Rear
I718H1450026-01
Yes
Go to Step 4.
Replace the ABS
control unit/HU.
ABS: 4E-44
No
Clean or replace the
rotor.
Adjust the clearance.