Ducati MONSTER 821 2016 Owner's Manual page 198

ABS
Check that the front (1) and rear (2) phonic wheels are
clean.
Attention
Clogged reading slots would compromise
system proper operation. It is advisable to disable
ABS in case of very muddy road surfaces, as in these
conditions the system might be subject to sudden
failure.
Attention
Prolonged wheelies could deactivate the ABS
system.
196
1
2
Fig 119
Fig 120