replaced the rotors/pads on my 91 929 yesterday.  pretty much a breeze, and
i have a new favorite tool--the impact  wrench!  I have been working on my
own cars for 20 years, and never came across the need or heard of this tool.

just a note to anyone who tries tho remove the rear rotors--there two
phillips head screws that bolt the rotor to the hub.  after 171k miles and
an hour of pounding, spraying, heating, and praying, these suckers were not
budging, and i was risking stripping the screw head.  my local napa showed
me an impact wrench for $36 ( i had a coupon for 20% off), and it worked
great in about one minute.  this is the kind that you hold with one hand and
hit with a hammer...i guess there is an air-compressed type if you have a
compressor--i do not.

anyway, once i got those screws outta there the job was no problem.  i
almost gave up and took it in, but my shop would have charged about $100 to
do the work for me.  the $30 I spent on the tool was well worth it imo.

now i'm going all through my house and garage looking for things to use it
on!  (but it's prolly the only time i'll ever use it...)

now on to the fronts--unfortunately i will have to take the rotors in to
have the bearings removed and pressed back into the new ones...

hope this helps.