Common problem nr.3 - the break is loose
This happened to me a few times. The old metal joints or the screws just give up in the crucial moment.
Little parts bent (or break off), the vehicle itself is unable to slow down just via "Stempelbremse" for example.
To fix the bent metal parts is not a bif deal. Yet one should take in consideration how much more to particular piece can take. In the following case the metal clip was easily reshaped into ideal position.