Join Date: Dec 2003
Location: Reality, TX, USA
I had the same problem. I lost the "top box" and never found it. So, I bought a replacement. The way the top box attaches itself to the luggage grid is a very poor design. It does not matter if it is locked or not, it will come loose and fall off. The two "hooks" that swing under the luggage grid have thin rubber spacers. If these get deformed or work them selfs off, as they eventually will, there is enough play to allow the case to vibrate off.
I purchased a new one and use bungee cords to add security. These bungee cords have save the new cas from comming off several times. It comes loose but stays on the bike.
As I said before, the BMW design of the way these attach to the bike is the problem. If you have one, tie it down.
Lache pas la patate