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1992-1999Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and
common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres
Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.
So will i just need to get a new master cyilnder, or will i also need to get a new booster?
Just a master cylinder. The booster doesn't have any contact with the fluid (and although yours has gotten wet on the outside, at this point there doesn't seem to be any reason for you to replace it).