If they show any damage, replace it.

Caliper Fluid Seal Damage
Caliper Piston and Cylinder DamageUpper Crankcase Assembly
When installing the breather plate, replace the gasket [A]
with a new one.
Apply a non-permanent locking agent to the threads of
the bolts [A] and tighten them.
Torque - Breather Plate Bolts: 9.8 N·m (1.0 kgf·m, 87 in·lb)
Install the fitting [A] until it is bottomed ...
Model Identification
ZX1000JB (US and CA Models) Left Side View
ZX1000JB (US and CA Models) Right Side View
ZX1000JB (EUR Models) Left Side View
ZX1000JB (EUR Models) Right Side View
ZX1000KB (US and CA Models) Left Side View
ZX1000KB (US and CA Models) Right Side View
ZX1000KB (EUR Models) ...
Brake Pedal Position Adjustment
NOTE
Usually it is not necessary to adjust the pedal position,
but always adjust it when push rod locknut has been
loosened.
Loosen the locknut [A] and turn the push rod with the hex
head [B] to achieve the correct pedal position.
If the length [C] shown is 69 ±1 mm (2.7 ±0.04 in.), th ...