Exactly 80 years ago on November 18, 1930 ...
... a writer for the Automobil-Revue took on the subject of "Be careful when braking!". He explained the problems of locking wheels and their effects on braking distances in depth. "No matter how good the brakes are, the driver will still not be able to stop from a speed of 70 km/h in less than 25 meters. Even this result still represents a kind of 'record braking'. On slippery roads, however, he can easily need ten times the braking distance, and if the car only has two-wheel brakes, it will still need at least twice the braking distance on a good road. ..."
Today, sports cars decelerate from 100 km/h to 0 km/h in little more than 30 meters. And even in poor road conditions, these values will more than double (excluding snow/ice). And cars with unbraked axles have not been produced for more than 50 years.
A special aspect at that time was the dusty roads and a German inventor wanted to remedy this by simply sucking the dust away from the wheels. He immediately filed a patent application for his invention. The illustration is taken from the patent specification of the time.
