Brake pad and liquid-propellant rocket engine: what they have in common

1. Step 1. Brake pad — is part of — Brake caliper. Pads.
2. Step 2. Brake caliper — has part — Piston. Pistons.
3. Step 3. Piston — is part of — Shock absorber. Inside, a piston moves in oil.
4. Step 4. Shock absorber — is part of — Landing gear. Shock struts.
5. Step 5. Landing gear — is part of — Lunar module. Legs.
6. Step 6. Lunar module — has part — Liquid-propellant rocket engine. A descent engine.

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