Here are some possibilities depending on *what* the "different" brake feel is:
* Brake light is illuminated and brakes feel spongy or soft: This often points to air in the brake lines (a leak somewhere), low brake fluid, or a failing master cylinder. The spongy feel means the brakes aren't responding as firmly as they should.
* Brake light is illuminated and brakes feel hard or stiff: This could indicate a problem with the power brake booster, a vacuum leak, or potentially a seized caliper. It might be difficult to depress the pedal.
* Brake light is illuminated and brakes pull to one side: This usually signals a problem with one of the wheel cylinders, calipers, or brake lines on one side of the vehicle.
* Brake light is illuminated and ABS light is also on: This indicates a problem within the Anti-lock Braking System (ABS). While the brakes might still function, there could be underlying issues that need attention.
* Brake light is illuminated and you hear a grinding noise: This is a serious problem and likely indicates worn brake pads or rotors, possibly even damage to calipers or other components.
In short: The lit brake light is a warning of a serious issue. The change in brake feel provides additional clues about the nature of the problem. Do not attempt to diagnose or fix this yourself. Have a qualified mechanic inspect and repair your brakes immediately. Driving with faulty brakes puts you and others at risk.