Neither A nor B is correct. Between each piston seal is a spring that maintains its place.
One element of a hydraulic drum brake is a wheel cylinder. The brake shoes must be forced apart and pressed up against the braking drum by the wheel cylinder. As a result of the friction created, the wheel slows down. Every time the driver steps on the brakes, this takes place. As the metallic particles on your brake pads wear off the pad's surface as they heat up, they acquire a static charge. That is how the black, metallic dust adheres to the steel and alloy wheels as well as other components of your car. Additionally, those petroleum adhesives have the potential to form a coating that sticks to your wheels.
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