Brake fluid change / brake bleeding

[Craig D. Niederst]

I have owned my '92 100S for 4+ years, and have never changed the brake
fluid as of yet. Bentley specifies every 2 years, and for all I know, mine
maybe original. Paging through Bentley, they make it look like the fluid
change / bleeding process is very simple. The only thing they mention to do
"special" is to make sure the brake pressure regulator's lever is pushed
towards the rear axle when bleeding the rear brakes (unless you have
ABS+EDL, then the procedure is more involved). I remember a thread awhile
back that mentioned that bleeding ABS equipped cars was not simple due to
the high pressure used in the lines. I did not see an answer then, so is
this true? Would I be better off to have a shop do this for me? Or can I
just open the bleeder screws at all 4 wheels and use my MityVac to suck out
all the fluid, refill w/ fresh DOT 4 fluid, and bleed the brakes? Also, any
opinions on the best brake fluid to use? I use Castrol LMA (low moisture
absorption) DOT 4 on my vintage British cars, but is it OK for the Audi?
Anyone switch to DOT 5 silicone fluid? Any reasons to try those Racing Blue
type fluids? Any opinions greatly appreciated.

Craig
'92 100S (90k)
'86 CGT (193k)