APRILIA Tuono V4 1100 Factory Service Station Manual page 542

Braking system
ALWAYS REPLACE BOTH PADS AND MAKE SURE THEY
ARE CORRECTLY POSITIONED INSIDE THE CALLIPER.
•
Fit the safety retainer clip (4) as shown.
•
While pressing the centre of the safety
retainer clip (4), fit the pin (3) so that it
passes over the clip.
•
Fit the retainer ring (2).
BRAK SYS - 542
Tuono V4 1100 Factory