The force needed to loosen the nut is such that you may have to prevent the car from moving — you may even need someone inside applying the brakes .

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Move aside a disc caliper or take off a brake drum (if not integral with the hub) in the usual way (See Renewing drum-brake shoes ).

Rearhubassembly replacement cost

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Wheel HubAssembly Kit

On cars with no central hole in the wheel, loosen the hub nut with the wheel off: a helper applying the brakes is essential.

If not, support the carrier on blocks (if detached from the car) and knock the flange out, using a suitable socket or pipe as a drift to avoid hammering it directly.

Details vary from car to car: when dismantling, make notes or drawings of how all these parts are arranged and which way round they go.

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The inner race of an inboard tapered roller bearing may remain on the drive shaft. If so, tap it off gently with a soft-faced hammer.

Rearwheel Hubbike

You may now be able to pull the hub carrier free. If not, disconnect the drive-shaft outer joint (See How to check U-Joints ). Support the part of the drive shaft that remains on the car to avoid straining its joints.

The hub bearings are exactly like those of a non-driven hub, and you dismantle them in the same order. But it is usual for the 'hub' - properly called the drive flange - to turn on bearings inside the hub carrier. So the inner race revolves, while the outer race is stationary.

In some driven hubs the arrangement is similar, except that the `stationary axle' - the hub carrier is hollow and the drive shaft runs through it to connect with the hub.

There is likely to be a plastic water shield on the inner side of the hub assembly, either attached to the drive shaft or clipped to the hub carrier.

RearWheel hubbearing

The bearings may remain in the hub carrier, in which case you can remove them in the same way as bearings remaining in a non-driven hub.

The procedure for refitting a driven hub is exactly the same as for a non-driven hub. Clean all parts thoroughly (except plastic shields) with paraffin or white spirit, inspect bearings and renew if damaged.

Rearwheel hubassembly diagram

Dismantling is much the same as for a non-driven hub (See Removing wheel bearings ). But there is one major difference — the hub nut is usually very tight; if possible, loosen it with the wheel on the ground .

Remove the hub dust cover and hub-nut locking device in the usual way — on some cars this means raising and removing the wheel, then replacing and lowering it.

The type of bearing used also has much in common with non-driven wheel bearings (See Checking the half shafts ). However the bearings of live rear axles are quite different.

With tapered roller bearings , if you only want to check and lubricate them, there is no need to drive out the outer races if you can still see them clearly.

Detach the water shield from the hub carrier. Prise out the inboard oil seal , taking care not to scratch its seating. You may now be able to pull the drive flange out of the hub carrier.

Rearwheel hubAssembly replacement

Work with the car raised on axle stands under frame members. Chock the wheels that are on the ground, and apply the handbrake if it operates on those wheels; otherwise release it. Loosen wheel nuts before raising the wheels.

There is also an extra grease seal on the outboard side of the pair of bearings. As usual, renew all grease seals whenever you dismantle a hub. There may be additional spacer rings between the seals and bearing races.

The main difference between driven and non-driven hubs is that a drive shaft projects into a driven hub from the inner side.

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Lubricate the hub with an approved grease, consulting the car handbook or a dealer for details of the type and quantity.

If the car has a MacPherson strut (See Renewing MacPherson-strut inserts ), remove it from the body and the track control arm (but with unit replacement suspension remove the lower half of the strut only).

Extend the handle of a socket wrench with a length of pipe for extra leverage. Check if the hub nut has a right or left-hand thread, then loosen it.

On a rear-wheel-drive car you may not need to remove the hub carrier: if you can disconnect the drive shaft, you can dismantle the hub with the carrier still in place.

The outboard grease seal may also be left on the drive flange. Prise it free, taking care not to scratch its seating, and discard it.

Cars with front-wheel drive have front-wheel bearings that resemble closely those in the rear wheels of rear-wheel-drive cars which have independent suspension (See How car suspension works ).