Ok so theres a fluid leak where the master cylinder meets the brake booster.. The black plastic covering on the booster is coming off and its kind of rusty looking underneath.

can i fix this? could it be like a gasket? Im just not sure what to do/buy. I found a whole used cylinder/booster combo for $30 so i was thinking of just getting that

or there was a new one for $31 for just the master.

 

well if it is the brake booster thats leaking, keep pressing the brake pedal with the engine off and it should get harder to press, if not then its probably the brake booster. or maybe its just a seal between your master cylinder and brake booster

 

There is a seal there? thats what i was trying to figure out..to see if it was the whole cylinder needing replacing or if it could be a minor repair.

 

Maybe you just need to replace the rod seal:

 

thats exactly what i was looking for and where it appears the leak is, thanks!