Ducati 749S 2002 Manuel D'utilisation Et Entretien page 148

Checking brake pads for wear
To facilitate inspection without removing the pads from
the calipers, brake pads have a wear mark. If the grooves
in the friction material are still visible, the pad is still in
good condition.
Important
Have the brake pads replaced at a Ducati Dealer or
Authorized Workshop.
E
58
(fig. 57)
MIN
fig. 57