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have you checked the bulbs?. my next step would be to test for power at the brake light switch and then step on the pedal and see if power flows through on to the other side of connector, if it does then we know theres power and switch is working good, my next move would be to step on the pedal and have someone watch the brake lights and then with pedal pushed turn 4way flasher on and off and see if the lights lite up for brakes and then wiggle the signal light lever and see if the lights come on, if the brake lights come on when any of these steps are done then you have a bad signal switch, if this does nothing then i would look under the dash and locate the harness wiring from signal switch to it junction, this will be a block of wires held together with a center bolt, wiggle wires while on the brake, i have seen the power wire for the brake lights burn inside connecter, and last would be to check the wiring going to lights inside the truck, good day, hope this helps.
you may have a bad master cylinder that is not pushing the brake pedal to the stop when not breaking.in other words the master allows the pedal to rest lower as it doesn`t have sufficeint residual pressure to push the pedal back,or the pedal is catching on something not allowing it to return to its rest position.this can cause the rear brakes to apply slightly as the pedal not being all the way in the rest position is applying just enough pressure to the system.if the pedal is going all the way to the floor then you need to check for a fluid leak in the system including the master cylinder(internal leak)if no external leak is found.
You probably have a bad brake light switch. This switch is located on the brake pedal arm or a bracket next to the arm. This switch activates the brake lights when the pedal is pushed. You can check this by turning on your turn signals or warning flasher if your light flash in the rear. Your bulbs are good so this will bring you back to the brake light switch.
The first thing to do is check the brake light switch under the driver side panel up a little where the brake pedal bends. This brake light switch is mounted under the panel so that a small plunger extends to where the brake pedal contacts it when the pedal is at rest (your foot off). This plunger is held in by spring pressure built into the switch and is in the off position. When you step on the brake, the pedal moves forward releasing tension on the switch spring turning the brake lights on. If the switch is stuck or jammed in the off position, no lights, if it is stuck on the on position, brake lights all the time and a run down battery.
This switch cost a couple dollars on the internet, but shipping makes it about ten bucks. You can buy one at an automotive supply "Auto Zone?" for about seven bucks. and it mounts to a bracket under that panel. This switch is about the size of your thumg with a two inch plunger.
Did you check the brake pedal switch?
Usually it is under the steering column were your brake pedal arm resting on it!
Stepping on brake pedal makes the switch supply power to brake lights, check if its still working or wires been cut off or the connector got disconnected!
Brake light switch? Its mounted near the top of the brake pedal lever. The lever contacts and holds the switch closed which keeps the lights from turning on when at rest. When you step on the brake, the contact is broken, the switch extends and completes the circuit allowing the brake lights to illuminate.
Hi ...... the brake pedal circuit is 'live' even when the ignition is switched off. Its sounds like you have a 'short' between the brake circuits and the rest, my guess would be at the back of the car. Have you had any work done lately ? Or heavy object in the boot/trunk ? Check ither side of the boot/trunk (behind or near rear lights) for chaffed, broken or melted wires. Make up a simple bulb testing lamp, one 12v bulb with a wire on positive and one on negative and place these wires into/on the wires going to your rear lights (neg' to earth) ......... this will tell you if the circuit has power going to it and by going back along the route you'll pinpoint the damaged or problem area. First step is to make sure both rear light clusters have good earthing points.
Let us know how you get on.