BMW 2012 R 1200 GS Rider's Manual page 105

How to interpret the marks:
Three rings visible: brake-pad
thickness is at least 75 %
Two rings visible: brake-pad
thickness is at least 50 %
One ring visible: brake-pad
thickness is at least 25 %
No rings visible: brake pads
worn to wear limit; check as
described above
Check front brake fluid
level
A low fluid level in the
brake reservoir can allow air
to penetrate the brake system.
This significantly reduces braking
efficiency.
Check brake fluid level
regularly.
Make sure ground is level and
firm and place motorcycle on
its center stand.
Move handlebars into straight-
ahead position.
Read off brake fluid level at
front brake-fluid reservoir 1.
The brake fluid level in the
brake-fluid reservoir drops
due to brake pad wear.
Front brake fluid level
Brake fluid (DOT4)
The brake fluid level must
not fall below the MIN mark.
(Brake-fluid reservoir hori-
zontal, motorcycle standing
upright)
If brake fluid level drops below
permissible level:
Have the defect corrected as
soon as possible by a special-
ized workshop, preferably an
authorized BMW Motorrad re-
tailer.
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