So far this is a US and Canadian issue.
http://www.motoring.com.au/news/road/honda/goldwing/no-honda-gold-wing-recall-for-australia-45923A well-publicised recall is currently happening in North America, but it doesn’t affect Australia
The American and Canadian recall of particular models of the Honda GL1800 Gold Wing does not apply to the Australian market, Honda Australia has announced.
In December 2011, a safety recall due to a rear brake drag issue was announced for GL1800 2001-2010 models in America and Canada. It is important to note that there have been no reports of injuries or crashes related to this issue.
Currently, there have been no reported cases of rear brake drag in the Australian market.
While the cause analysis into the American failures is ongoing there will be no action within the Australian market. If as a result of the investigation into the cause of the symptom in the American market it is determined that Australian market is also affected, the appropriate action will be taken.
Affected local owners will be notified directly by Honda Australia if any action is required at a later date.
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As for the secondary master cylinder between 1300 and Goldwing it would depend on how the system is designed. The 1300 uses the same/similar set up to the previous 1100A whereas the wing may be different depending on the model and year.
The current wing seems to be electronically controlled between front and rear (green from front LH to rear)
http://world.honda.com/GoldWing/chassis/page03.htmlimg_braking by
Alan, on Flickr