A quick google search for ford third brake light leaking will reveal a variety of different fixes that other people have come up with.
F150 third brake light leak fix.
I didn t feel like.
Examine the foam rubber gasket where you saw bubbles and you may see why it was leaking.
The only part required is a replacement gasket.
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.
Removing the brake light.
Unscrew the two mounting screws visible on the front of the old brake light.
Start by removing the two screws holding the brake light to the cab.
I bought this peel and stick variety and it worked.
Once you do this.
Fixing an f 150 third brake light leak replacement gasket.
The fix is simple and will only take about 20 minutes.
Do not do this.