Brake Fluid Replacement at 40K miles

[Joe Murphy]

Why does Lexus recommend replacing brake fluid at 40K miles for my 2014 RX350? Is this something new?

[1990LS400]

Per the 2014 RX350 maintenance manual at the following link, brake fluid is to be replaced every 30,000 miles or 36 months whichever comes first:

https://drivers.lexus.com/t3Portal/document/omms-s/L-MMS-14RX350/pdf/MY14_Lexus RX 350_WSG_lr.pdf

That seems odd since the braking system on our 2014 Toyota Sienna is virtually identical as is the braking system on the Toyota Highlander.  Changing the brake fluid on the Sienna is not in its maintenance schedule and is considered "lifetime".

[heit1]

Porsche recommends changing brake fluid every two years.  It absorbs moisture from the air, so mileage isn't really a factor.  You can purchase brake fluid testers from Amazon and check it yourself.  If you are going to keep the car for an extended period I would change it every two years.