Compression Ignition Addict
Join Date: Dec 2007
Thanked 253 Times in 244 Posts
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I don't think it's doin' a whole lot.....
If you have vacuum hubs maybe it could leak a little vacuum if it were really torn. It's a pretty tight fit and with a little grease even an old one is probably doing everything it's supposed to.
I've had my hubs in & out several times and am still using the original ones.
The Knuckle Seal however, could really be a source of a leak for vacuum hubs! They are driven in with a tool and the metal-to-metal force is pretty high. In fact, getting an old one out without damaging it is near impossible if they're original.
That seal sells for like $60 and would be the reason for not replacing it when quoting the job. Again, if you've got Manual Hubs it's not as important.