Ducati 998R Manuel De L'utilisateur page 108

Checking brake and clutch fluid level
Fluid level should never fall below the MIN mark on
each reservoir (fig. 29). If level drops below the limit, air
might get into the circuit and affect the operation of the
system involved.
Brake and clutch fluid must be topped up and changed at
the intervals specified in the routine maintenance chart
(see the Warranty Booklet) by a Ducati Dealer or
Authorized Workshop.
E
Important
It is recommended all brake and clutch tubes be
changed every four years.
Clutch system
If the control lever has exceeding play and the
transmission snatches or jams as you try to engage a
gear, it means that there is air in the circuit. Contact a
Ducati Dealer or Authorized Workshop to have the
system inspected and air drained out.
Warning
Clutch fluid level in the reservoir tends to increase
as the clutch plates friction material wears out. Do not
exceed specified level (3 mm above minimum level).
40
Brake system
If you find exceeding play on brake lever or pedal and
brake pads are still in good condition, contact a Ducati
Dealer or Authorized Workshop to have the system
inspected and any air drained out of the circuit.
Warning
Do not spill any brake and clutch fluid on the
paintwork or on plastic parts or they will damage.
Hydraulic oil is corrosive; it may cause damages and lead
to severe injuries.
Never mix different quality oils.
Check seals for proper sealing.
MAX
MIN
fig. 29