My 1999 buick lesabre has a dinging noise when a brake sensor

you will need to change the switch on the brake peddle. sits behind the cover. this can happen in an emergency and you also push peddle to the side wile ding it.

Sounds like someone took out the instrument panel and didn't reinstall it right.

sounds like you have a bad ignition switch

This light also indicates other brake system problems. You can also have a park brake switch that is stuck on or damaged in some wayy, check that first.

first check to see if you have enough brake fluid in the resevor and that you don't have a leak somewhere. If not you might be able to have a code reader pull the brake codes. If anti lock brakes it might be as simple as changing a sensor. If everything is checking out disconnect the positive battery cable for 10 minutes, this should clear the brake light. As for the chiming you will have to dig around under the dash to find the little noise maker and then unplug it. I just had to do it to my car and truck.

Try getting the brake pads replaced.

Yes sounds like serious problem, especially the harder to stop, If you mean the car just isn't stopping as fast and included with the pedal getting closer to the floor sounds like you have a brake fluid leak. Might be leaking from a line maybe the master cylinder or caliper or wheel cylinder, any which way probably should get checked out.

Hi the RED BRAKE LIGHT is also for low brake fluid
check the brake fluid level in most cases if the brake fluid is low you need the brakes replaced

you have one of two problems the first one is either a blowm fuse that is probably marked prk lghts check you fuses or you could have a bad light switch

possible ignition switch default. I have seen this before