BMW HP4 Rider's Manual page 137

Check the brake fluid level in
brake fluid reservoir 1.
Wear of the brake pads
causes the brake fluid level
in the reservoir to sink.
Brake fluid level, front
Brake fluid, DOT4
It is impermissible for the
brake fluid level to drop below
the MIN mark. (Brake-fluid
reservoir horizontal)
If the brake fluid level drops be-
low the permitted level:
A low fluid level in the
brake reservoir can allow air
to penetrate the brake system.
This significantly reduces braking
efficiency.
Check the brake-fluid level at
regular intervals.
Have the defect rectified as
quickly as possible by a spe-
cialist workshop, preferably
an authorised BMW Motorrad
dealer.
Checking the brake-fluid
level, rear brakes
Make sure the ground is level
and firm and hold the motor-
cycle upright.
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