What is the correct classification of the following reaction? 
Definitions:
Steering Knuckle
A component of the steering and suspension system that connects the wheel and tire assembly to the vehicle's front axle.
Caliper Piston Seal
A seal in a brake caliper that prevents fluid leakage and ensures the piston moves correctly to apply the brake pads.
Caliper Piston
A component within a brake caliper system responsible for moving the brake pads against the rotor to slow or stop the vehicle.
Piston Bore
The cylindrical opening within the engine block in which the piston moves up and down during the engine's operation.
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