Join Date: Jul 2004
Location: Berlin, NA, Germany
Well, from experience i can say they do stop the pads falling out whilst driving IF installed PROPERLY!!!
This happend to me on a tour in 2015, the rear pads dropped out whilst moving, made a hell of a racket. And wrecked the caliper in the process. Luckily, Ducati Bielefeld were not too far away and they had a used caliper with pads lurking on a shelf. 75 euros later it was fitted and we were all back on our way. At this point the tech checked the front pads too. They also were not fitted properly - the pin wasnt driven in deeply enough that the sprong collar was holding properly.
Moral of the story, when you buy an new used bike, check the P.O. new how to fit CRUCIAL parts like brake pads properly.
1992 900SSie, Moto Guzzi V50 Monza, Vespa PX192