My 89 na rx7 appears to be leaking brake fluid out of the bottom of the reservoir/top of the master cylinder. Is there a seal here or do I just replace the whole combo. Thanks in advance.

 

there is a rubber seal there.
You can either try to source another O ring or get another complete master.

 

Does it take a specific o - ring or can I get a generic one?

 

sorry..it's a bushing..my bad.( I don't replace little stuff like that.I just put on a new or used known working master..heh,heh.)

MAZDA PART # 0305-49-686B

SEE FOR YOURSELF.
Go to Foxed.ca Select Rx7 Manuals ..sec gen.
89 parts manual
chassis sectopn.
brake master.(non turbo)
scroll down to 4340

OR try Rock Auto.(online parts store) for a new Re-man Master(get the Complete master with reservoir...some stores will sell just the metal piston part thingie!)
I've ordered stuff from them and have Zero complaints about the parts or the service.

 

Yea I have ordered from rock auto before I just wanted to know if the o ring was replaceable. Well I guess not oh well.

 

Thank you for the help

 

hey no problem.
keep that website link on file.(thanks to Sgt Fox..Thayer..for making the site up for us and others.)
It's one of the most informative sites that a lot of the members use to help source part numbers or get Factory service manual info.