Safety device that holds the nut in place that connects brakes to wheelchair did not keep nut in place despite following manufacturer's installation instructions.Position of bolt allows torque from brakes to loosen nut beyond the positioning of the safety cap that covers the nut.Wheel fell off wheelchair causing fall with head injury.All of these same brakes are removed from other wheelchairs.Upon removal of these same brakes from other wheelchairs, the nut was loose behind each of the orange safety caps.It appears that the orange safety cap covers approximately 1/4 inch or less of the bolt and the torque from braking results in a loosened nut with that doesn't engage the 1/4 inch of protection.
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