Q: What does it mean when the Brake light comes on sometimes? on 1997 Mercury Villager

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Brake light comes on sometimes when turning right and goes off after a left turn
(1) Answer
You have a float sensor inside the master cylinder that will trip the brake lamp when the brake fluid drops to a certain level. Check the brake fluid level in your master cylinder and top off as needed to stop the dash brake lamp to stop coming on as you described. Be sure to check under the vehicle to make sure that you dont have a brake fluid leak or that your brake pads or shoes are worn out. Any of these conditions will cause the float level to drop inside the master cylinder, triping the lamp.