Derbi boulevard 125 4t, Workshop Manual, Page: 49 / 182

Possible Cause Operation
Defective piston sliding Check calliper and replace any damaged part.
Electrical system
Battery
BATTERY
Possible Cause Operation
Battery The battery is the electrical device in the system
that requires the most frequent inspections and
thorough maintenance. If the vehicle is not used
for some time (1 month or more) the battery needs
to be recharged periodically. The battery runs
down completely in the course of 5 ÷ 6 months. If
the battery is fitted on a motorcycle, be careful not
to invert the connections, keeping in mind that the
black ground wire is connected to the negative ter-
minal while the red wire is connected to the termi-
nal . Follow the instructions in the ELEC-
TRICAL SYSTEM chapter for the recharging of the
batteries.
Turn signal lights malfunction
TURN INDICATOR NOT WORKING
Possible Cause Operation
Electronic ignition device failure With the key switch set to "ON" jump the contacts
1 (Blue-Black) and 5 (Orange) on the control unit
connector.
If by operating the turn indicator control the lights
are not steadily on, replace the control unit; other-
wise, check the cable harness and the switch.
Steering and suspensions
Heavy steering
STEERING HARDENING
Possible Cause Operation
Steering hardening Check the tightening of the top and bottom ring
nuts. If irregularities continue in turning the steer-
ing even after making the above adjustments,
check the seats in which the ball bearings rotate:
if they are recessed or if the balls are squashed,
replace them.
Troubleshooting
TROUBL - 49