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Well what kind of car are you doing it to? I mean it all depends on Domestic or Import. For example.
An 82 Camaro horn has a wire that signals when you touch the horn to it, completing the circuit. For that application all you would have to do is take that wire and run it down to the break pedal. Then put a piece of metal there on the pedal (if the pedal or pedal arm is coated) and set up the wire to come in contact with that pedal with the slightest depression of the pedal, thus completing the circuit, honking the horn.
For some Imported cars you have totally different setups. Some are like switches, some are like levers, some are chip based and some are wire based. You have to give specifics.
You should just be able to add a wire to the wiring of the horn into the brake light harness or power wire to the break lights. Then sprice that to the horn wire and it should work when they depress the break.
But you could blow the bulb or fuse too. So know what your doing first.
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