Ever tried to stop quickly only to have your foot hit both the brake and accelerator pedals at the same time? Or tried to work the pedals with winter boots that overlap them?
That might have caused the vehicle to bang to a stop or lurch forward – or both. Either way, such an experience can be disconcerting and disorienting.
The Subaru Brake Override System (BOS) is intended to help prevent such situations, which frequently result in accidentally accelerating the vehicle.
For BOS to function, both pedals have to be depressed while the vehicle is moving faster than 6 miles per hour.
The vehicle’s computers monitor the engine’s electronic accelerator and the operation of the brake. BOS compares data from both systems. Using that, it determines if both have been applied simultaneously and if the accelerator is pressed down 80 to 100 percent of the way.
If so, BOS still doesn’t immediately spring into action. Instead, a built-in delay gives the driver time to react by lifting his or her foot off the two pedals. If that doesn’t happen, BOS takes over to stop the vehicle.