Last January my brakes went out (fell off) on my boat trailer.....the place where I get all my trailer maintenance said it would cost $700 to fix it or he could remove the brakes and replace both hub assemblies for $300.....he said my brakes have not worked in a long time and he does not think I need them for the boat size and my truck size.....he said he has been using this new type hub for 5 years and has only seen one go bad.....seemed like a no brainer to me.....I stopped by there today to verify my maintenance required.....he said they are good for 5 years but it may be good to check them in 2 to 3 years.....the good news is, you do not have to do anything to them.....no grease to add periodically.....he showed me a cross section of the assembly and all the extra seals in it.....the grease is a solid that liquefies when it gets hot and goes back to solid when it cools off....the grease builds up an internal pressure (3 to 6 psi I believe) when it heats up and a cap on the end of the hub pops out and goes back when the grease cools off.....all you have to do is check every now and then for any leaks....7 months for me now and no leaks.....anyhow, I love the "no maintenance" required by me thingy....so if anyone is going to replace their bearings you may want to consider these....here is a link to the bearings info......if you want to know the dealer I use in Baton Rouge please send me a PM......
http://www.ufpnet.com/Portals/0/PDFs...aintenance.pdf
