I recently was alarmed to find a bolt that secures the over run brake pushrod cylinder to the A frame bracket had sheared, resulting in an alarming amount of vertical movement on the coupling. The movement also caused the bracket on the front of the A frame to break. The caravan is a Knaus Starclass560 2008 with an Alko chassis. Having replaced both pushrod cylinder bolts and the bracket I note I have a small amount of vertical movement on the pushrod. Is a small amount of vertical movement permissible or do I need to replace the cylinder bushes.