1988 Honda Civic dx hatchback, horn and brake lights not working. All fuses are working correctly, what's the next step in fixing this issue?

1988 Honda Civic dx hatchback, horn and brake lights not working. All fuses are working correctly, what's the next step in fixing this issue? - 1

Check the horn with the battery straight to it. Check brake light switch.

Ok

Check the rest of the fuses. Check relays.

Its an 88… There's the catch

Hi so the issue here is what you expect from a old honda civic with over 29 years of life behind it. So a 1001 reasons.

Getting a test light and checking for 12 volts on one of the horn connectors wires.
Using the test light to find out if the brake light switch is making contact and sending power to the brake lights when the pedal is held down.
Have you even taken the brake light bulbs out to see if the bulb elements are broken or not?