Glossary “piston” Definition:
1). Engine part that reciprocates in the cylinder and transfers the force of the expanding gases via the piston pin and connecting rod to the crankshaft. 2). A round, caliper component in a disc brake that is moved outward by fluid pressure to press the pads against each rotor face. 3). An aluminum or sintered-iron component of a drum brake inside a wheel cylinder that supports the cylinder cup. 4). That part of a compressor that is driven by a crankshaft to compress vapor. 5). A small piston fitted inside a hollow cylinder which moves back and forth by fluid pressure to transmit reciprocating motion inside the transmission.