PIAGGIO 633929(IT), Service Station Manual, Page: 58 / 314

Insufficient braking
I
NSUFFICIENT BRAKING
Possible Cause Operation
Inefficient braking system Check the pad wear (1.5 min). Check that the
brake discs are not worn, scored or warped. Check
the correct level of fluid in the pumps and replace
brake fluid if necessary. Check there is no air in
the circuits; if necessary, bleed the air. Check that
the front brake calliper moves in axis with the disc.
Fluid leakage in hydraulic braking system Failing elastic fittings, plunger or brake pump
seals, replace
Brakes overheating
BRAKES OVERHEATING
Possible Cause Operation
Rubber gaskets swollen or stuck Replace gaskets.
Compensation holes on the pump clogged Clean carefully and blast with compressed air
Brake disc slack or distorted Check the brake disc screws are locked; use a dial
gauge and a wheel mounted on the vehicle to
measure the axial shift of the disc.
Defective piston sliding Check calliper and replace any damaged part.
Electrical system
Battery
BATTERY
Possible Cause Operation
Battery This is the device in the system that requires the
most frequent attention and the most thorough
maintenance. If the vehicle is not used for some
time (1 month or more) the battery needs to be re-
charged periodically. The battery runs down com-
pletely in the course of 3 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 terminal while the
red wire is connected to the terminal .
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 (Red/Blue) on the control
unit connector. If by operating the turn indicator
Troubleshooting
MP3 125
TROUBL - 6