If the boot is intact and the pressure that builds inside is just
forcing a little to come out where the boot clamps on the axle, it's
not a big deal. Simply wipe it off and continue. It'll never
completely leak out. (By the same token, this will fail a safety
inspection in some states.) If you want to repair this situation,
simply replace the clamp on the boot.
If the boot is physically torn or broken, all the grease can
eventually come out and lead to damage to the axle joint. This would
need to be repaired by replacing the boot.
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