Maintenance question - 40k brake and fuel injection flush?

Brake Fluid ages by absorbing water from the atmosphere, Phoenix should have some of the least humid atmosphere in the country. There are test strips you can use if you suspect water contamination. amazon.com/Phoenix-Systems-3003-B-Package-Condition/dp/B00E6TXWA6

I would not bother with fuel injector additives more often than every 100,000 miles, but I buy from a station with a high turnover, less popular gas may need more cleaning.

 

There are more important maintenance items you should be doing at 40K: Replace the transaxle fluid and lubricate the brake caliper sliding pins. These procedures are shown in the NutzAboutBolts videos, which you can find in the Gen iii Prius Maintenance and Troubleshooting section

 

just follow the maintenance guide in your manual, add the tranny as rebound suggests above and ignore the dealer.

 

Hmmm what to do... trust the dealer or trust some strangers on the internet. I know what I definitely would not do. I'm not going to trust the dealer reaching for my wallet

 

This is why I do my own car maintenance. You can see videos which show how to do this work, and decide whether it's something you (and maybe a friend) can tackle yourself:
Nutz About Bolts Prius Maintenance Videos | PriusChat

Neither job requires much in the way of tools, although there are a few special items you'll need to buy: For the oil change, a large funnel, thick plastic tubing and a drain pan. (The video does the fluid change with a pump, which also works and costs little). And you'll need a 1/2"'breaker bar and a special socket. Not too bad at all.

For the brake job you'll need a jack and a jack stand, and very standard hand tools. Cheaper tools work better for this, because there's a part where you need a thin wrench, and high quality wrenches are too thick.

 

I would pass on the fuel injection flush. But: Toyota Canada recommends brake fluid to be changed every 3 years or 48,000 km's (30,000 miles). You can DIY this too, relatively easily. @NutzAboutBolts has a video on this, pinned in the 3rd gen maintenance section:

Nutz About Bolts Prius Maintenance Videos | PriusChat

I did this recently, my wife helped pumping the brakes. It helps to have the car raised and wheels off, though I don't think it's absolutely necessary. Also, I modded the order from the video somewhat, works about the same. I used no vacuum tools, just a large mayo jar, some tubing, a grommet for pushing over the bleed screws, a syringe with extension, and a few wrenches. I made some comment here:

Nutz About Bolts Prius Maintenance Videos | Page 4 | PriusChat

Bottom line: brake fluid attracts water, and perdiodic (time related more so than mileage) changes are warranted. Honda too, recommends 3 yearly, regardless of mileage, for a long time now.