What does the term "piston stroke" refer to in a brake caliper?

The term "piston stroke" in a brake caliper specifically refers to the movement of the piston that pushes the brake pads against the rotor. When the brake pedal is engaged, hydraulic pressure is applied to the piston in the caliper. This pressure causes the piston to move, which in turn forces the brake pads against the rotor, creating the friction necessary to slow down or stop the vehicle.

This mechanical process is crucial for effective braking. The distance that the piston travels during this action is what is referred to as the piston stroke. A proper understanding of this mechanism is essential for diagnosing brake issues, ensuring that the brakes function effectively, and maintaining the safety of the vehicle.

Other terms listed, such as the movement of the brake pedal, the distance between the brake lines, and the compression of the brake fluid, pertain to different aspects of the braking system and do not directly define the piston stroke in a brake caliper.