Hydraulic brake and boyle’s air pump: what they have in common

1. Step 1. Hydraulic brake — has part — Hydraulic cylinder. Wheel cylinders press on the shoes.
2. Step 2. Hydraulic cylinder — has part — Piston. The piston is moved by liquid.
3. Step 3. Piston — is part of — Boyle’s air pump. A plunger.

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