On: Benz remotely controlled vehicle stuck in cruise control mode for 1h at 120km/h

[vegardx]

There is no such thing as "manual break override". You will always be able to use breaks in any car, regardless of what systems they're running. You might be without a booster, but still.

You can also just shut the engine down with the ignition switch.

[Skunkleton → vegardx]

That isn't true. There are many models with no mechanical linkages for the breaks.

[F2 → Skunkleton]

You're confusing the parking brake for the hydraulic braking system.

The brake pedal is alway mechanically connected to a split/redundant hydraulic braking system.

[vegardx → vegardx]

Park break, yes. Regular breaks, no.