sure, quite a few of us put hydro brakes on our pre 03 blasters.
for fronts you'll need the complete 03+ front setup including the spindles,
or get the ken oconnor racing conversion spindles @ kenoconnorracing.com (blaster parts)
and most any raptor, banshee, warrior hydro parts to piece together a set-up for less than complete 03+ stuff.
like this..........
http://www.blasterforum.com/threads/low-buck-front-hydros.20811/
for rears, depending on your fabrication skills, you can use 03+ blaster or banshee/rappy/yfz rear hydro parts,
weld on mounts for the master and caliper, or swap to 03+ blaster carrier/axle.
or message me for info on my ready to bolt on rear set-up