said. Not flushing your brake lines @ 30k will not void your warranty. Too long between oil changes will void your warrant, as will neglecting to properly rotate your tires. But that's the tire Co's warranty, not Subaru's.
The other comments just show how some get freaked out if they think the warranty is in jeopardy, so they do everything, even when it's not required to maintain the warranty.
When the dealer is challenged, they will NOT tell you it's required, but they will say "It's necessary". Very important play on words...
But hey, that's my two cents, and how I maintain my cars. You need to do what you do, for and to your own car. From the sounds of it, you've already missed the 30k service by almost 10k, so as of this thread, it's a moot point to worry about it now.
But, you really do need to get your oil changed, ASAP! That will affect anything down the road, as far as engine warranty work.
Now, as to the CVT being checked @ 30k? Yes, I will be getting that at my 30k service, along with my regular oil change.
Now, that being said, if my dealer offers to do the brake flush for under $100 extra, I'll most likely do it. BUT, I refuse to pay $400~$600 for the entire service! That's just ridiculous...
I did it with my last Outback, to the tune of $480, and had a leak in the brake lines after!
They did fix it, but it could have caused me to loose control and crash.
They way I look at it, if it ain't broke, DON'T FIX IT!
Yes, brake fluid attracts moisture, but the system is sealed! So if moisture does get in, there's something wrong with the system, and needs to be fixed anyway.
Normal absorption of moisture in brake fluid occurs over YEARS, and many thousands of miles, not 30k miles.
The general rule for brake fluid is to change it while doing brake pad (Replacement) maintenance. How often? Depends on how hard you are on your brakes...