Quote:
Originally Posted by Biodiesel300TD
I second that.
I never really though about it before but it's funny that the same part can result in two different very symptoms when it goes bad. Hard ride or really bouncy ride. They must fail in two ways. Not sure how though. 
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What I've heard is when the diaphragm fails, initially the nitrogen mixes with the hydraulic fluid, forming bubbles that make the ride bouncy for the same reason your brakes get spongy when they need bleeding. Eventually the bubbles purge out and then the ride gets hard, because all the compliance is gone from the system.