Lift the housing away and twist the light sockets out of the brake light housing.
F150 third brake light leak fix.
Once you do this.
After trying 2 new 3rd brake lights i determined it was the seal on the window that was leaking.
The fix is simple and will only take about 20 minutes.
A quick google search for ford third brake light leaking will reveal a variety of different fixes that other people have come up with.
Removing the brake light.
I didn t feel like.
Start by removing the two screws holding the brake light to the cab.
The only part required is a replacement gasket.
Do not do this.
The most common fix that people seem to do is to permanently seal the third brake light assembly to the back of the cab with an adhesive such as glue or urethane.
Unscrew the two mounting screws visible on the front of the old brake light.
Examine the foam rubber gasket where you saw bubbles and you may see why it was leaking.