Help me get an idea why both rear wheel hubs went bad at 75,000 miles at the same time

2014 Prius 75,000 miles

Some info that might help you help me in case there’s something I need to stop doing:

- I use the parking brakes every time I park, (put the car in neutral, push down on the normal brakes and then push down the parking foot brake down as hard as I can with my left foot then release regular brake and put in park, shut off engine)

- Tires are a couple PSI lower than recommended.

- Tires are reaching their end of tread life. (5-4cm left)

- I avoid cracks and potholes all the time. (Irrelevant?)

- The age of the wheel hubs, seals and lubricant losing its shelf life? (Stock wheel hubs still on)

I can’t think of anything else.

Thanks.

 

It was starting to sound like I had an engine in the back of the car at speeds above 30mph, two weeks ago and the sound is getting more pronounced the more days I drive, then one week ago it threw DTC codes that my left hand and right hand rear ABS sensors were not detecting the correct gap (wheel hub is moving around). Starting to feel the vibration of it in my steering wheel as of yesterday.

 

I see, but does cranking the parking brake all the way down with the foot (I’m a big dude with strong legs) could make the parking brake plates push in the rotor assembly too much?

 

Not used to a foot parking brake so first time around using it, I probably couldn’t crank a hand brake that hard with just arm strength. Will stop doing that once I replace both the rear wheel hubs, hopefully these bad ones will last until next Sunday, going to be doing short trips only and using girlfriends car for work trips.