BMW CE 04 Rider's Manual page 156

150 MAINTENANCE
WARNING
Insufficient or contaminated
brake fluid in the brake fluid
reservoir
Considerably reduced braking
power caused by air, dirt or
water in the brake system
Stop riding immediately until
fault is rectified.
Check brake fluid level regu-
larly.
Make sure that the lid of
the brake fluid reservoir is
cleaned before opening.
Make sure that brake fluid
is used from a sealed con-
tainer only.
Park the E-Scooter, making
sure it is on level and firm
ground.
Align the handlebars so that
the brake fluid reservoir is po-
sitioned horizontally.
Read off the brake fluid level
from the sight glass 1 of the
left/right brake fluid reservoir.
The brake fluid level in the
brake-fluid reservoir drops
due to brake pad wear.
Brake fluid level
Brake fluid, DOT4
The brake fluid level must
not fall below the MIN mark.
(Brake fluid reservoir horizon-
tal)