When you replace the accumulator, I suggested bleeding out all the old fluid.. because chances are your'* isn't going to be brand new.. and you should flush your brakes every 2 years, otherwise the brake fluid comes corrosive, and well, look what happened to my brake lines.. mine are rusted and falling apart, thanks to lack of maintenance IMO. You are there, you may as well take the extra time to do it. De-pressurize the brakes. Remove the fluid in the resevoir.. i use a shop vac, but I don't know if that is the best method. pull fuse #9 [I am at my dad'*, I don't have my car in walking distance], make sure the ignition is off, and remove the accumulator, put the new one on. Pour in some fluid.. i'd say half a resevoir, you can always add fluid. Then bleed the brakes until you get no air, and the fluid is nice and pretty.
Some my disagree with me on this, and that is okay, but this is just my opinion.
'89 SSE - GX3 -190k, 155k on body - Back for another ride.