to my knowledge there is official recall on the rear brake to replace the master with a larger one. It sounds to me your dealer is not up to the task as the recall is for all Rockets, at least pre- storm
A notice regarding the Triumph Rocket 3 is that there is a recall on the rear brake master cylinder, which may not move fluid properly, potentially leading to extended stopping distances; affected owners should contact their dealer to have the rear brake master cylinder replaced free of charge.
Key points about the recall:
- Affected models: 2020-2024 Rocket 3 R, Rocket 3 GT, Rocket 3 TFC, including Rocket 3 GT Triple Black and Rocket 3 R Black.
- Issue: The rear brake master cylinder may not move fluid consistently due to potential air bubbles, causing increased brake pedal travel.
- Solution: Dealers will replace the rear brake master cylinder with a new one.
- Recall number: Refer to Safety Recall Action Notice SB611