A DASHBOARD ICON NOW STAYS LIT. IT SHOWS A VEHICLE WITH TAIL OR REAR BRAKE LIGHTS. DOES THIS MEAN WE HAVE A BAD BRAKE LIGHT?

Usually if my right blinker is flashing fast it means one of my right blinkers is not working either front or back right side. Not sure but I know every vehicle I have ever had was like that. One blinders not working the other flashes fast, on the dash also.
This post he repaired the problem it was the light switch.
Right rear tail light stays lit, won't turn off
https://www.bimmerforums.com/forum/showthread.php?2301226-Rear-tail-light-stays-lit-won-t-turn-off

on older nissans dashoard and tail light is on same fuse. can you please check fuses on drivers side under your steering wheel? check #16.

It means one of your tail lights or brake light bulbs is burned out.

Should indicate that your have a light out in the back of the car. It could be either a main tail lamp light/brake light, turn signal, license plate light (only on some models I believe) or even a trunk light.

the fuse is labled 'brake'

I would replace the fuse... and then have someone stand to the rear of the vehicle and watch the lights come on as I applied the brake... if the fuse blows again... note which tail light did NOT come on durring this test and replace the bulb.. it is grounding to itself and causing the short.

could be fuses bulbs or loose wiring

The brake light and the turn signal are the same bulb. Most of the time if the bulb on the dash stays on it is because a bulb is blown and thats the way it tells you.

it indicates that a light is out on the vehicle possibly the highmount stop light or a headlight

The tail lights working would not necessarily mean that the brake light bulbs are good. If they are the type that have a double filament (ie: one filament for the tail light and another filament for the brake light ) the brake light filament could be bad and the tail lights still would work. If they are either single filament type bulbs or double filament type, I would check the bulb, fuses, and contact switch on the brake pedal.

you can remove the cluster and buy the bulb separate as far as the brake light it is either the float is bad in the master cyl. or you have low frt brake pads