a friend has a 2015 road glide rode good was leaking and low on fluid . took apart tubes were scored inside replace them and rebuilt internal now it bangs and will bottom out on a good bump, any idea what the problem is ?
... it didn't before with no/low fluid? Hmmm...
If the parts were re-assembled in the proper order and 12 oz (or SM spec) of Type E, maybe weak springs?
Back in 1992 at the factory police service school that issue was referred to as Fluid Lock. Once the oil is compressed as far as possible it acts and sounds like it's solid.