Never thought of that, good question.
Dumb question
When using the adaptive cruise control with stop and go --- I assume the brake lights come on when the car slows itself? They must! But then hard to tell from the drivers seat. Does anyone know for sure?
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Seems someone posted regarding a Ford Explorer ACC on a different forum. Take this with a grain of salt (as I have not first hand experienced it) but the car would have to actually be "braking" with the actual brakes for the lights to come on. Not engine braking.
It matters whether the ACC system is engaged or not:
- If ACC is on, the system will do autonomous braking. When it does, it will illuminate the brake lights.
- The system will not illuminate the brake lights when it uses the transmission to slow the vehicle.
- If the ACC is not engaged, forward collision warning is still working. FCW does not include autonomous braking, but you may sense the vehicle slowing through a combination of engine braking and the slight drag on the brake rotors caused by pre-charging the brakes. The brake lights will not illuminate until the brake pedal is depressed.
It seems the previous generations Fusions/MKZ's relied more on brakes, however the newer generations (CD4 platform) rely more on a combination, engine braking rather than a regular braking because the computers are smarter.
It matters whether the ACC system is engaged or not:
- If ACC is on, the system will do autonomous braking. When it does, it will illuminate the brake lights.
- The system will not illuminate the brake lights when it uses the transmission to slow the vehicle.
- If the ACC is not engaged, forward collision warning is still working. FCW does not include autonomous braking, but you may sense the vehicle slowing through a combination of engine braking and the slight drag on the brake rotors caused by pre-charging the brakes. The brake lights will not illuminate until the brake pedal is depressed.
It seems the previous generations Fusions/MKZ's relied more on brakes, however the newer generations (CD4 platform) rely more on a combination, engine braking rather than a regular braking because the computers are smarter.
I've actually tested it and yes they come on lol 
Hmmm.. I think you are joking? The only way to test would be another person/car behind you watching for brake lights. The reason I am interested is the car does some pretty aggressive slowing/stopping on the interstate when traffic comes to a dead stop. Way more aggressive slowing that I would do manually, driving without the ACC. Wondering if anyone behind me knows I am slowing down...
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