Glad I saw this, I just replaced the master and slave cylinder on my '90 Turbo. ArtyMR2 is right you can just get a place to re-do the cylinder but for me it cost me $260 for a new master, slave and fluid. So I just got new stuff.
Worst part for me was trying to reattach the slave to the gearbox, those 2 12mm bolts were just satanic. If you are going to replace it (which I suggest you do seeing as its not too expensive) bolt it up to the lines first then just spend 2 hours under the car trying to get the bolts into the box, don't bolt it to the box then try to hook up the lines.
As for bleeding. I was recommended this orgasmic method of
reverse bleeding. I tried the one man kits and pressurizing the master through the little hole in the lid but the feel of the peddle was stiffest after I did this. Because the bleed is at a low part in the system of an MR2 that makes it difficult to bleed but if you get a syringe from supercrap auto for mixing 2 stroke fuel it comes with a plastic pipe and you basically fill the syringe with fluid attach it to the bleed valve and push fluid back through the system till it starts to fill the master cylinder, doing so should push out any air bubbles. Took me 10min and would highly reccomend.