Hello,<br /><br />My axle broke on my trailer from rust i have found from links on this forum replacments. i know i have a 3500lb square axle it used to have hydraulic brakes but they never worked when i had the trailer ( the load is light now and it didnt need them ) anyways my question is i see assemblies sold with idler hubs? what are those? are they just small hubs with no braking system? And if so does that mean the axle doesnt have to have the brake plates?<br /><br />Thanks in Advanced