PIAGGIO MSS ZIP 100 4T, Service Manual

Page: 43 / 192

Transmission and brakes
REAR BRAKE LEVER FAIL TO RETURN
Possible Cause Operation
Return spring broken Replace spring.
Shoe control bolt not lubricated Lubricate with Z2 grease.
Clutch grabbing or performing inadequately
IRREGULAR CLUTCH PERFORMANCE OR SLIPPAGE
Possible Cause Operation
Faulty clutch Check that there is no grease on the masses. Check that the
clutch mass faying surface with the bell is mainly in the centre
with equivalent characteristics on the three masses. Check that
the clutch casing is not scored or worn in an anomalous way
Insufficient braking
INEFFICIENT OR NOISY BRAKING
Possible Cause Operation
Brake pads or shoes worn Replace the brake pads or shoes and check for brake disk or
drum wear conditions. If the front calliper is removed to facilitate
replacement, remember to replace the copper gaskets located
on the tube joint when refitting; failure to do so may result in
inadequate tightness; it is necessary to bleed the brakes after
this operation.
Air bubbles inside the hydraulic braking system Carefully bleed the hydraulic braking system, (there must be
no flexible movement of the brake lever).
Brake disc or drum deformed Use a dial gauge to check the levelness of the disk with the
wheel correctly fitted and the concentricity of the rear drum;
check the brake disc screws are locked
Fluid leakage in hydraulic braking system Elastic fittings, piston seals or brake pump breakdown, replace
Excessive backlash in the rear brake control cable Adjust backlash with the appropriate adjuster on the shoe con-
trol lever
The brake fluid has lost its properties Replace the front brake fluid and top up to the correct level in
the pump
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 change 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
Defective plunger sliding Check calliper and replace any damaged part.
Brake disc or drum deformed Use a dial gauge to check the levelness of the disk with the
wheel correctly fitted and the concentricity of the rear drum;
check the brake disc screws are locked
MSS ZIP 100 4T
Troubleshooting
TROUBL - 43