Unplug the 2 wires coming from the brake fluid reservoir. If that fixes it, it's a stuck float switch. Or maybe the fluid actually is low...
Then check the little button switch at the handbrake lever. If it's bent maybe the lever isn't pressing on it when you release the brake.
Depending on what year, maybe there's a connection from that circuit to the ABS or the ECU.
You've got remote start. Is that wired into the handbrake switch???