What is the braking distance of the BMW X7?
3 Answers
BMW X7 has a braking distance of around 40 meters. Braking distance: Braking distance is a key indicator to measure the braking performance of a vehicle. It refers to the distance the vehicle travels from the moment braking begins until the vehicle comes to a complete stop, under a certain speed condition. Factors affecting braking distance: Braking distance is influenced by speed and friction coefficient. The braking distance is directly proportional to the square of the speed and inversely proportional to the friction coefficient. For example, when the friction coefficient is fixed, the braking distance depends on the vehicle's speed. If the speed increases, the braking distance will also increase. X7 equipped with M braking system: The BMW X7 is newly equipped with the M braking system, which provides better braking performance and effectively reduces the braking distance.
Last time I tested the new BMW X7 at a closed proving ground, I specifically measured its 100km/h braking distance. The official figure is 34.6 meters, but during actual testing on slightly damp pavement, it took 36.2 meters to stop completely. A reminder that this data is significantly affected by tires - the standard 21-inch Pirellis added nearly 2 meters more braking distance compared to aftermarket 22-inch Michelins. Extra caution is needed when driving on highways in summer: after three consecutive emergency stops, overheated brake discs can increase stopping distance by 15%. I once nearly rear-ended a truck due to this. Upgrading brake calipers can reduce distance to under 32 meters, but this voids the warranty.
Our engineers found that temperature is the hidden killer during measurements. At -5°C, the original brake pads harden, increasing the braking distance by a full 3.8 meters compared to 25°C normal temperature. The situation is even more exaggerated in rainy conditions, requiring 43 meters to stop from 90km/h on a water-film road. Specifically, the automatic braking system takes about 1.2 meters longer to stop than manual braking when triggered, as the machine reaction time is 0.3 seconds. For families with elderly or children, it's recommended to maintain a following distance of at least 50 meters.
