There were problems with the oil baths on axles with brakes... Hub would heat up due to normal brake function, then cool down when dunked in the water... Expansion-contraction created negative pressure and pulled water in the hub past seals...(also, dragging brakes would over temp the hub and push oil out past seals due to expansion)
I really liked them, easy to see if you had lube or not... Asked for them on my current trailer and was told by my dealer that the OEM's shy away from them now due to the water entry issue, even though my current trailer doesnt have brakes...
Hydro
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