As with the previous generation Gold Wing the 2018 has a rubber line that allows air to get in the line for the hydraulic preload adjuster. So we recommend bleeding the preload adjuster and topping it off with fresh oil plus installing our new Steel Braided Line. The steel braided line replaces the poor quality OEM plastic line.
The OEM line tends to swell over time which allows air in the system. When there is air in the system you do not have a full range of adjustment with the preload adjuster.
With our steel braided line, manufactured specifically for the 2018 model Gold Wing the system will be sealed much better than OEM, very similar to steel braided lines in a brake system.