master cylinder is bad or air in brake system or you have a brake fluid leak somewhere in the system. look on the back side of the wheels in the rear and see if you see fluid. On the front you can easily see both the front and rear side and see if you see fluid. Sounds like a brake fluid leak somewhere as it is a closed system or did you replace the shoes or pads and didn't bleed the air out of the system.
Check the brake light switch on the brake pedal
Look under dash near brake pedal assembly for a damaged wire grounding when pedal is released. Repair and tape it out of the way.
check fuses, check brake light switch behind brake pedal.
The 2003 Dodge Caravan OBD 2 port is on lower edge of dash above parking brake pedal
It's under the dash, above the brake pedal
The 2003 Dodge Grand Caravan OBD 2 port is on lower edge of dash above parking brake pedal
Go to your local library and find the manual
It is under the dash on the driver side, Behind the parking brake pedal on the firewall.
If the parking brake pedal on your 2001 Dodge Ram 1500 is stuck to the floor, you might have broken the parking brake cable. Remove the rear tires to see if the cable is still attached and replace it as needed.
Gradual Loss of brake pedal height (pedal sinks to floor)? but fluid level proper--internal leak Loss of brake fluid? Back of master cylinder (where is attaches to booster) wet with brake fluid? External Remove master cylinder and see if booster has fluid in bottom (bad real seal)
You may have hit the e-brake pedal slightly so it kicks the light on. Try pulling it back up manually.
It comes as the entire gas pedal.