Phil writes: >It is used, for instance, in automotive engineering. A car with >hydraulic brakes - pretty well every car built since the early 1920s - >has a "master" cylinder attached to the pedal and "slave" cylinders on >each wheel hub. The same applies, of course, to hydraulic clutches.
For brakes, the terminology I've learned in the USA for brakes is master and "wheel" cylinders. I don't remember seeing a "slave" used for a wheel cylinder. I did a quick search of Google Groups, and scanned the first 50 hits for "slave cylinder" - and they were all (or nearly) about clutch slave cylinders. --henry schaffer