All cars have some form of vacuum powerbooster, but that's not the same as the electric brakepump, implemented into the 2K+ GS models, providing automatic and full hydraulic power to supplement a quick or strong brake-pedal movement. Earlier models didn't have this (electric pump) feature and is noticeable in (less) braking force. In general, people tend to brake harder (and later) with this feature, as it's more easy to do so. Btw, I got that info from my dealer, as they experienced a big difference in longevity of brakepads in cars that do (or do not) have that option.
Very true, but a quick look at the rotors (lip) could provide some quick info. If one sees a very pronounced lip (in a technical way that is), it might be more 'convincing' when a mechanic tells or shows him the rotors are done (and you don't have to take the wheels apart to see it). In an attempt to advice, this (and other info) can be a quick and visible clue in relation to a 'second opinion'. Perhaps some info is too technical, but it might help when speaking to a mechanic, as they feel you have some 'knowledge' and therefore are less motivated to 'scam'.
Good points Intaker...and as they say, "Knowledge is everything". Then there is the other side, "A little knowledge is a dangerous thing." A guy can't win!! LOL I think your point of proceeding with as much information as one can glean is best, as long as one understands what they know.
Merry Christmas, Paul