If you have to undertake auto repairs for your Triumph Adventurer then it is usually a good plan to have access to a Workshop Manual to use as personal reference in the event you need to know tips on how to strip off a specific part for example the Brake Discs and match it again in the right way.
Triumph Adventurer Workshop Manuals will give you particular diagnostic info for the vehicle so if something is wrong it will help you identify what the issue is and how you can resolve it. After that you can evaluate if you can do this by yourself or in the event the job is too big you can still book your Adventurer in to a local car garage.
Triumph Adventurer manual