How to Replace a Wheel Bearing in the Hub: Pressing the Old Bearing Out and the New One In

Confirm the part and repair scope

A worn wheel bearing usually makes a hum or growl that rises with road speed. The noise often changes as the vehicle's weight shifts during gentle turns. With the wheel off the ground and the vehicle securely supported, rock the tire at the top and bottom. Movement there can come from the bearing or a ball joint, while play felt at the sides usually points to a tie-rod end. Watch where the movement actually occurs, because joint play in the suspension can mimic a loose bearing. Tire wear, a failing CV joint or a dragging brake can also make noise, so confirm the source before buying parts.

Next, identify the bearing design. Many vehicles use a bolt-on hub and bearing assembly that is replaced as one unit, with no pressing involved. Others use a cartridge bearing pressed into the steering knuckle or rear carrier, with the hub flange pressed through the bearing's inner race. The pressing procedure in this guide applies to that second design. Whether to replace only the wheel bearing or the entire hub depends on the hub's condition. If the hub flange is scored, the wheel studs are damaged, or the old inner race is seized to the hub, replacing the hub at the same time is usually sensible. Pressing in a bearing alone needs fewer new parts but more tools and labor than swapping a bolt-on unit.

Order parts using the vehicle identification number or the exact model, year, drive layout and brake and ABS configuration. Bearings for the same model can differ in size and in whether they carry a magnetic encoder for the wheel speed sensor. Also buy any retaining clips, axle nut and single-use bolts that the service manual calls for.

Prepare tools and safe access

Pressing work requires a hydraulic shop press or a dedicated hub and bearing press kit. The kit needs receiving cups and adapters that match the bearing's outer diameter and the hub's dimensions. You will also need a breaker bar, a torque wrench, snap-ring pliers, penetrating oil and a bearing separator to remove an inner race left on the hub. Have the vehicle's service information on hand for the removal sequence and every fastener specification. An on-car press kit can avoid removing the knuckle, but access and force limits vary by model.

Raise the vehicle only at the manufacturer's lifting points. Set it on rated jack stands on firm, level ground and chock the wheels that stay on the ground. Never work under a vehicle held only by a jack. This job involves large forces, brake and ABS components, and suspension fasteners that affect steering. Without a press, the correct adapters and experience with suspension work, consider removing the knuckle and having a shop press the bearing, or leaving the whole job to a professional.

Remove without avoidable damage

On a driven axle, loosen the axle nut before lifting, with the wheel on the ground or the brakes applied as the manual directs. Remove the wheel, then unbolt the brake caliper and hang it with wire so the hose carries no weight. Remove the caliper bracket and rotor, then disconnect and remove the wheel speed sensor so it is not damaged. Separate the knuckle from the axle, tie-rod end, ball joint and strut as your procedure requires. On designs where the strut-to-knuckle position affects camber, mark it before separating. Push the axle out of the hub with a puller rather than striking its threaded end.

Support the knuckle securely on the press and press the hub flange out of the bearing. The outboard inner race half usually stays on the hub. Remove it with a bearing separator and the press, taking care not to damage the seal surface. Remove the retaining snap ring or clip, then press the old bearing out of the knuckle using an adapter that bears on the outer race. Keep the knuckle supported close to the bore so the casting does not bend or crack.

Corrosion is the usual reason a wheel bearing sticks in the hub or a hub assembly sticks in the knuckle. Apply penetrating oil and give it time to work. Then use a hub puller or a slide hammer with the correct adapter rather than hammering on the bearing or the hub face. Avoid heat near the ABS sensor, rubber boots, seals and wiring. If the bore is pitted or out of round after removal, the knuckle may need replacement, because a new bearing will not seat correctly in it.

Install and restore the system

Clean rust and debris from the bore and check it for burrs, cracks or other damage. Confirm the bearing's orientation before pressing. On bearings with a magnetic encoder, the encoder side must face the wheel speed sensor, and it should be kept away from magnetized tools and metal debris. Press the new bearing into the knuckle by pushing only on the outer race until it seats fully against the shoulder. Then install the retaining clip so it sits fully in its groove.

When pressing the hub into the wheel bearing, support the bearing's inner race from the opposite side with a suitable adapter. If the force passes from one race through the rolling elements to the other, it can dent the raceways and leave the new bearing noisy from the start. Once the hub is in, turn it by hand. It should rotate smoothly, with no roughness or play.

Reassemble in reverse order, using new fasteners wherever the service manual specifies single-use parts. Tighten each fastener to its published specification. Suspension bolts that clamp rubber bushings may need final tightening at normal ride height so the bushing is not preloaded. Install the axle nut and tighten it as directed, including any staking or locking step. Seat the wheel speed sensor clean and fully home. Reinstall the rotor, caliper bracket and caliper, then pump the brake pedal until it is firm before moving the vehicle.

Check the completed work

Before lowering the vehicle, spin the wheel to confirm it turns freely. Rock it at the top and bottom to confirm no play remains at the bearing. Once the vehicle is on the ground, tighten the wheel fasteners to specification. If the knuckle was removed or the strut-to-knuckle or tie-rod connections were disturbed, have the wheel alignment checked. These mounting points directly affect camber and toe.

Road test at low speed first to confirm normal braking and steering, then drive at the speeds where the original noise appeared. Investigate further if any of these signs appear: an ABS or traction control warning light, noise that persists, a new hum or vibration, steering that pulls, or a wheel that feels hot after a drive. These signs can point to a damaged encoder, an incorrectly pressed bearing, a fault on the other side, or a different component altogether.