Will this require any wiring modifications to my existing brake light circuit?

The unit is designed as a direct replacement, so it should tap into your existing brake light harness without additional wiring. Confirm connector compatibility before final installation.

Does the sequential sweep activate every time I brake, or can I control it?

The sweep is automatic—it triggers whenever brake pressure is applied. Once installed, the pattern runs continuously during braking without a separate control switch.

What's the lifespan of the LED array compared to standard bulbs?

LEDs outlast incandescent bulbs by thousands of hours, so you won't be replacing them. If the entire assembly fails, you'll replace the whole unit rather than individual bulbs.