![]() Continued hard braking will shorten its life and even an emergency stop may bring the damper to the end of its life prematurely. You may be able to compress the coupling by pushing the coupling head and simulating the overrun system on lightweight braked trailers & caravans but otherwise, if you can push it back easily or it feels ‘springy’ then generally the damper has failed.ĭampers are usually very reliable and will last for many years (or many miles), generally, the life of a damper can be shortened by lack of maintenance or bad driving habits. The dampers assembled within overrun couplings are pressurised so if they are working correctly it is difficult to check their operation as it requires a considerable amount of pressure to push the coupling back by hand. Sometimes badly adjusted brakes can have the same effect as a failed damper. When the damper has failed it is very noticeable by the fierce application of the brakes or ‘snatching’ when the towing vehicle’s brakes are applied.īefore replacing the damper it may be worth checking the adjustment of the brake shoes to the drums. ![]() The correct operation of a coupling damper gives smooth and controlled braking.
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