BMW C 650 GT Rider's Manual page 106

If the wear indicating marks are
8
no longer visible:
104
WARNING
Brake-pad thickness less
than permissible minimum
Diminished braking effect, dam-
age to the brakes
In order to ensure the depend-
ability of the brake system, do
not permit the brake pads to
wear past the minimum per-
missible thickness.
z
Have the brake pads replaced
by a specialist workshop,
preferably an authorised
BMW Motorrad dealer.
Checking brake-pad
thickness, parking brake
Make sure the ground is level
and firm and place the Maxi-
Scooter on its stand.
Visually inspect the brake pads
to ascertain their thickness.
When you look into the holes
in the carrier plate (clean the
holes first), the brake disc
should not be visible.
If the brake pads are worn past
the minimum permissible thick-
ness:
ATTENTION
Parked vehicle rolls away
due to lack of braking power
if brake pads are worn past
https://www.motorcycle-manual.com/
Brake-pad wear limit of
parking brake
their minimum permissible
thickness
Risk of damage to parts if vehicle
topples despite extended side
stand
Have the brake pads of the
parking brake replaced before
they wear to their minimum
permissible thickness.
Have the brake pads replaced
by a specialist workshop,
preferably an authorised
BMW Motorrad dealer.