I have a 91 T-Bird that is leaking brake fluid. Breaks work well sometimes and not so well others. Since its leaking I would assume bleeding the system would do no good. Any ideas on how to patch a leak for a quick temporary fix? Thanks in advance for any info

Traditionally brakes are a very important part of the vehicle to insure stopping the vehicle when needed.

Proper repair of the system will insure this happens.

What exactly is leaking ?

A "quick temporary repair" should NEVER be done to your braking system. Your life as well as others around you are at stake. Replace or rebuild anything that is leaking.