I'm a french canadian from Montreal (Quebec) and proud owner of a Red RX-7 1993 Touring edition in very good condition. I'll try my best to describe my problem.

In the rear passenger side, one (there is two) of my rear brake lamp bulb dosen't light on when pressing on my brake pedal.

It works fine when driving on day and night lights mode, as soon as I press the brake pedal the light goes off. I've even tried the bulb in another brake bulb socket and it works fine. So the problem is in my bulb socket connector wich has two little plomb spots where the bulb sits on.

How could I clean these socket connectors?
What could be wrong?

Any ideas?
Thank you !