3 ms·

just saw another one, really black magic to me https://www.youtube.com/watch?v=P-giC24SxwE https://www.youtube.com/watch?v=P-giC24SxwE

• userbinator 5y ago
  That's actually not surprising at all for air brakes in good condition; braking pressure is supplied entirely by air, and drum brakes are used because they have a much larger area of friction material than disc brakes, and thus can provide a higher stopping force in the same volume. Their main disadvantage is brake fade, which is why heavy trucks use their engine brakes very often. Another fact that might seem counterintuitive at first is that a heavily loaded truck can stop faster than an empty one. This is because it has more weight on the wheels, which means more force before they start to skid, and the brakes themselves are not the limiting factor.