Brake lights and Tail lights not working.

Replace both lights bulb

Brake light switch under dash and actuated by the brake pedal lever is out of adjustment or faulty. Adjust or replace it and you'll have your brake lights back. The dim tail lights may just be that you have possible replaced them with the wrong bulbs or the ground to light housing is faulty.

Your right brake light is not the same bulb as your rear running light that comes on with the headlights. Different bulbs. Your right brake light is simply burnt out or has worked its way out of the connection. Take it to Advance Auto Parts. They may even change it for you. Not a big problem.

Fast flashing dash signals mean there is a bulb issue-DEFINATELY!

there must be a short circuit which powers tail lights and brake lights. probably you have a dual filament bulbs which have both brake and tail light together. check for bulb, socket/or bulb housing and harness of that light.

first eliminate the possibility that you have the wrong bulb in the wrong socket. it sounds dumb but going way back to 1157 bulbs there have been two rear tail light bulbs which will fit into the same socket but are electrically different. If you have ever driven down the road following a car which had one bright and one dim tail light, or brake light, then you have seen this in action.

since you have one good tail light assembly remove the bulbs, taking great care not to mix them up and make sure the bulbs are exactly same as in the non working assembly. i mean you have to look closely at the bulb's connection points as they will look very much the same.

if the bulbs are correct then you are looking at buying a new socket, or light assembly if the whole thing is wired into the car.

Have someone pull the bulb, and check for 12 volts as you press brake pedal, if no voltage, check the harness, make sure nothing in the trunk has interfered with the wiring.

what you are seeing is the bright filament on the bulb working,
the tail light bulbs have two filaments in each bulb,one is dim and one is bright,the bright one is to the brake and turn signals,that way when you step on the brake with the tail lights on the same lens light up brighter to warn drivers behind you..
you need to check the fuses in the car for tail lights first,see if your plate light is on that will tell you the bulbs are just blown

the tail light and brake lights are working from double contact bulbs. check the grounding, you dont have enough ground from one of the bulbs

There should be at least 2 bulbs in the light assembly. One light is the light that is on when you turn on your headlights with out the brake pressed, the other light only lights up while you press on the brake. Make sure you are replacing the correct bulb. You may have been replacing the bulb that stays on. Your lights may be set up to turn off the light that stays on when the headlights are on while pressing the brakes.