hi somewhere on my 91 camaro rs i have a leak i go through fluid very fast. also my brake light is on and sometimes my back drum brakes smoke on the drivers side it even feels like they dont disengage. any help on finding and solving this problem would be great thank you.

 

Get under the car and do a visual.

From the manual:

"The pressure differential warning switch is designed to constantly compare front and rear brake pressure from the master cylinder and energize the warning light on the dash in the event of a front or rear system failure. The valve and switch are so designed that the switch will latch in the "warning" position once a failure has occurred. The only way the light can be turned off is to repair the failure and apply a pedal force to develop approximately 450 psi line pressure."

JamesC

 

look at the bottom inside of each drum and see if fluid is/has been leaking out (you'll be able to tell, it'll be discolored, etc). A faulty wheel cylinder on the back could be your culprit for both the leak and the rear brake problems.