i think i have an O ring leaking from my NEW.. master cylinder. 81 malibu with the standard mc,nothing special. i think it's from the rear reservoir O ring. i'm pretty sure they just need to be popped off but i have read where some have a pin or bolt that needs to be removed. don't see a pin or bolt on mine. seems to be on pretty tight. i think i removed one years ago and just pried it off without any damage to it. am i on the right track? thanks