Well, after sitting on my replacement globes for 9 months, I finally replaced them today. And boy, I wish I had done it sooner. 2009 LX w/ 164k miles on the clock. I've owned it for 2.5 years, since 137k.
I discovered a total failure of my rear driver-side globe.
I did a visual check on removal and could see the metal diaphragm on the first 3 globes. On the last one, it was a black hole. So I grabbed a pencil and could feel the collapsed diaphragm on the bottom of the globe. Wow. Take a look at the red circled reference mark. It was nothing more than a bowl full of AHC soup.
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As it goes, the car now rides like a dream. I had previously replaced the fluid last summer, which helped the ride a bit. I had no idea what I was missing. It eats up the bounces when driving over the nearby railroad tracks. I'm not exactly sure when the diaphragm collapsed, but the ride quality has certainly degraded casually over the last ~5 months.
Other notes from the job:
- the rear passenger globe spewed AHC fluid everywhere upon removal, despite being double bled per @baktasht 's video. It was the only globe that did that.
- definitely get the 6-sided 21mm socket. Even then, I nearly stripped the bolt on the last globe. So glad I didn't use a 12-sided socket.
- Going from Low to Neutral is taking a long time. 30+ seconds long. N to H is quick. Previously L to N was a fast process. Hopefully this speeds up over time.
- even my wife noticed the ride difference.
I can't thank
@baktasht enough for his videos! His Redarc brake controller installation video was equally helpful. And thanks to everyone else for sharing their experiences. I'm not a mechanic by any means, but I got to play the part today!