I've had this fault , it was sometime ago and i'm getting old so i can only go from what i can remember . Check your rear brake sensor and it's lead , i had trapped mine between the frame and the Givi carrier frame work , causing a short . I've also seen a cracked sensor where it fits to the hub plate , the bike ( not mine ) would do the static test ok , but would fail on a road test . I think that the static test only tests the pump system function and not the wheel sensors , sensor rings function . Also check the sensor ring / sensor ( inside the hub under the sensor mounting plate ) for dirt and filings attracted to the magnetic sensor end , which may cause incorrect signals ( though unlikely ) .
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