Common causes for wheel bearing failure are improper lubrication and excessive wear and tear. After so many miles, even the best wheel hub assemblies need to be replaced. Generally, you should inspect your wheel bearings and the entire wheel hub assembly every 20,000 miles or so. Wheel hub replacement components are necessary to stabilize your car and ensure a safe ride. Although some wheel hubs can last over the 125,000 mile mark, most wheel hub and their related assembly parts require complete replacement at 75,000 or 100,000 miles. The two biggest factors for determining wheel hub assembly performance are driving style and climate.
To perform your own wheel hub inspection, safely jack your car up and spin the entire wheel hub assembly. It should spin freely; if not, there may be issues with the internal bearings or external blemishes and defects. The "one side = both sides" rule, common with brake pads, rotors and other axle parts, also applies to your wheel hub assembly; if one side needs replaced, you're better off just replacing the entire axle set. If you replace just one wheel hub, sooner or later you'll need the opposite side; it's only a matter of time. You might as well finish the job for good while you're already working on your car.
A: I'm glad to assist, Ol' Gasser! You'll need to buy two of these Wheel Hub Assembly - Part No. NT513179 per vehicle to complete both front wheels. This bearing is manufactured to give you quality and performance you can expect. It is made of high quality steel and surface finishes. It is QS 9000 and ISO 9001 certified and exceeds OE quality standards.