My cruise control won't work and my brake light is on. The car is a 1994 Toyota Camry. Thank you.

Your brakes warning light or your actual brake lights? If it is your warning light that can come Monday if you're park break is on or slightly on or the switch that says that it is on is faulty, in which case it may tell your cruise control to turn off. If your brake lights stay on there's something pul to you about your switch by the pedal as your cruise will not work when you hit the bricks and this will be perceived as you hitting the brakes. A break warning light will also, come on if your brake fluid is low.

If you mean the light on the dashboard that says "brake" then you should replace your brakes or get the car's computer tested (if the brakes have been checked recently). Cruise control will not work if the car's computer thinks that there is a problem with the brakes.