Brakes Overheating - VESPA 946 E4 EMEA 2021 Manual

Vespa 946 E4-E5 EMEA-USA-ASIA (2021-)
Possible Cause
Worn valve guides
Insufficient lubrication pressure
Possible Cause
By-Pass remains open
Oil pump with excessive clearance
Oil filter too dirty
Oil level too low
Transmission and brakes
Clutch grabbing or performing inadequately
IRREGULAR CLUTCH PERFORMANCE OR SLIPPAGE
Possible Cause
Faulty clutch
Insufficient braking
Possible Cause
Inefficient braking system
Fluid leakage in hydraulic braking system
Brake disc slack or distorted

Brakes overheating

Possible Cause
Defective plunger sliding
Brake disc slack or distorted
Clogged compensation holes on the pump
Swollen or glued rubber gaskets
Electrical system
LOW LUBRICATION PRESSURE
Check the By-Pass and replace if required. Carefully clean the
Perform the dimensional checks on the oil pump components
Check that there is no grease on the masses. Check that the
clutch mass contact surface with the bell is mainly in the centre
with equivalent characteristics on the three masses. Check that
the clutch housing is not scored or worn in an anomalous way
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
Failing elastic fittings, plunger or brake pump seals, replace
Check the brake disc screws are locked; measure the axial shift
of the disc with a dial gauge and with wheel mounted on the
BRAKES OVERHEATING
Check the brake disc screws are locked; use a dial gauge and
a wheel mounted on the vehicle to measure the axial shift of
Operation
Check and replace the head unit if required
Operation
By-Pass area.
Replace the cartridge filter
Restore the level adding the recommended oil type
Operation
Operation
front brake calliper moves in axis with the disc.
vehicle
Operation
Check calliper and replace any damaged part.
the disc.
Clean carefully and blast with compressed air.
Replace gaskets.
Troubleshooting
TROUBL - 71