I think you are referring to the
"IS" system. If so, normal lubrication, inspection and replacement of the rubber blocks when it becomes cracked/weak. Alignment is critical on this suspension.
I think most folks find that replacement of the rubber block is necessary, they move to the next capacity up, especially if they loaded near the max. rockin'
Not looked up the specific interval for brake fluid change....but I for sure would bleed out the old fluid and introduced fresh fluid. Brake fluid has a great affinity for moisture and that's one of the bad guys in the brake system. Very cheap insurance. Even though my vehicles may not have a regular service interval on brake fluid change I do it for my piece of mind. Many foreign cars have a regular service interval on brake fluid. rockin'