If they show any damage, replace it.

Caliper Fluid Seal Damage
Caliper Piston and Cylinder DamageStopping the engine
Close the throttle completely.
Shift the transmission into neutral
Turn the ignition key to “OFF”.
Support the motorcycle on a firm,
level surface with the side stand.
Lock the steering.
NOTE
The motorcycle is equipped with a
vehicle-down sensor, which causes
the engine to sto ...
Technical Information - Electronic Steering Damper (ESD/ZX1000JD/KD models)
1) Overview
This model has an Electronic Steering Damper (ESD)
[A]. Unlike conventional manual adjustment method of
Kawasaki, damping characteristics are adjusted by the
electronic control unit.
2) Purpose
Designed to offer increased stability at high speed without interfering with
light ...
Brake Fluid Leak (Brake Hose and Pipe) Inspection
For KIBS equipped models, remove the fuel tank (see
Fuel Tank Removal in the Fuel System (DFI) chapter).
Apply the brake lever or pedal and inspect the brake fluid
leak from the brake hoses [A], pipes (KIBS equipped models)
[B] and fittings [C].
If the brake fluid leaked from any posit ...