2002 pontiac Grand Prix...the brake sensor dash light is randomly on & off while driving. Brake pads are good brake fluid is good and emergency brake is not on?

Check your brake fluid level. Low fluid levels will cause the brake light to come on. If the fluid is not low, there could be a problem with the emergency brake light switch or the brake fluid level sensor.

Remove wheel, remove the two bolts in the calipers, spread and lift off calipers,
remove pads compress caliper piston with a c-clamp, be sure to have the brake fluid cap off the reservoir under the hood. - replace pads and reverse the order.

The FLOAT sensor on your BRAKE master reservoir that tells your brake fluid is LOW is acting up!

Check the brake light switch on the brake pedal up under the dash,it is most likely the problem.

check to see if your emerg brake is on, or if its sticking, E-brake shuts them off on GM...

damaged wire touching earth ?? somewhere?? take wheels off and have a look

Your brake peddle switch may be out of adjustment or defective. Look under the dash to the peddle & about half way up you will see the switch. Make sure it is releasing & working properly. Good luck!

the fan switch needs to be replaced it is worn out on the lower speeds ..maybe youre brake fluid needs to be flushed and new brake fluid put in

it should be the switch that gives electricity to your lights, its probabbly not a brak problem but a electrical problem
hope this helps

dont know if this will help... but my Windstar had the same issue with the lights... it was just the sensor screwing up or no longer attached properly. as far as the grinding goes... it could be the abs kicking in because of a faulty sensor, but poke your head in and take a look at the brake assembly and make sure your pads are ok and that everything is attached properly.

hope it helps:)