VESPA GT 200, Workshop Manual

Page: 84 / 287

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8.2.2 Poor Braking Performance
Symptom Possible Cause Operation
Pads or disk excessively worn;
brake fluid quantity insufficient
or hydraulic system faulty
Check the pads wear;
MIN allowable dimension:
Brake pads wear 0.06 in
( 1.5 mm )
Ensure that the brake disks are not
worn, scratched or deformed
Check the brake fluid level in the
pumps and, if necessary, replace the
brake fluid
Check that there is no air in the
circuit and bleed as necessary
Check that the front brake caliper
moves correctly along the front disk
axis
Brake disk loose or distorted Check the tightening of the brake
disk screws. Using a comparator and
with the wheel mounted onto the
vehicle, measure the disk’s axial
deviation
Poor braking
performance
Brake fluid leakage from the
hydraulic system Replace faulty flexible connections,
piston, or brake pump gaskets as
necessary
8.2.3 Brakes Overheating
Symptom Possible Cause Operation
Defective piston sliding Check caliper and replace any
damaged parts
Brake disk loose or distorted Check the tightening of the brake
disk screws. Using a comparator and
with the wheel mounted onto the
vehicle, measure the disk’s axial
deviation
Pump compensation holes
clogged
Clean thoroughly and blow with
compressed air
Brakes
overheating
Rubber gaskets swollen or
sealed Replace gaskets