Why is my 2004 Toyota Camry abs and brake light on?

If the 2004 Toyota Camry abs and brake lights have come on then You need to address it right away. What this means is that Your brake system is not working in the way it should. In most cases, this means that You need to replace the brake pads, due to normal wear and tear. This is common and cheap to do. In some cases, though it might be that the brakes are going to fail soon, and will need to be repaired. This will mean that the car is unsafe to drive. If You have an accident while the light is on then You will be liable for the damages, so You need to get on it as soon as possible.