Lower control arm

A lower control arm is the hinged link that joins the wheel hub to the car's chassis, letting the wheel rise and fall over bumps while holding it at the correct angle. It carries a large share of the car's weight and absorbs most of the shock coming up from the road.There is one behind each front wheel, low down, and cars with multi-link rear suspension carry rear lower control arms too. Each arm has soft rubber bushes at the chassis end and a ball joint at the wheel end. Those two are the parts that wear; the arm itself almost never does.Replace it when you find:

• A clunk over bumps: a dull thud from one corner on vertical hits, which points at the bushes.
• A knock when turning: a sharper noise as you pull out of a parking space, which points at the ball joint.
• Steering that wanders: the car drifts rather than pulls, and needs constant small corrections.
• An alignment that will not hold: the tracking is set, then drifts out again within weeks.
• Uneven tyre wear: the inner edge goes first, or a feathered pattern appears across the tread.
• Cracked or collapsed rubber: the bush has split, squashed to one side, or come away from its metal sleeve.

When a lower control arm goes bad, the car clunks over bumps and wanders at speed, then starts eating the inner edge of the tyre as the alignment slips. If the ball joint is the worn part, the ending is worse: the stud can pull out of its socket, the wheel folds under the car, and the steering on that corner is gone.Rubber perishes with age, potholes and kerbs bend arms, and once a ball joint boot splits the grease escapes and the joint wears fast. Worn bushes only make noise. A worn ball joint can drop the wheel, so a lower control arm replacement is not a job to leave until next month.Parthunt24 lines up used lower control arm listings from leading marketplaces such as ProxyParts, eBay, Ovoko, TotalParts, Opisto, Ecooparts, Ricambipro, and Autoparts24 in one place, where the lower control arm price, the side, and the state of the bushes on all 499 offers show together.

An arm can bolt straight on and still be the wrong arm.Arms are side-specific, so a front lower control arm off the left will not do duty on the right, and the OEM number is the only thing that settles which one you are looking at.After the number, read what the listing includes. Some arms arrive with the ball joint pressed in and the bushes fitted, others are a bare casting and the joint or the rubber costs extra. Confirm the suspension type, since standard, sport, adaptive, and air-sprung cars often take different arms, while a bigger engine or a different drivetrain can alter the geometry on a car that looks identical from outside.The left-hand filters take your make and model, and everything that cannot fit your car disappears from the list. Open a listing and Parthunt24 passes you through to whichever site advertised it, perhaps eBay, perhaps Opisto, where the seller's own detail and the checkout sit.

• Vehicle make, model, and year: Manufacturers revise suspension systems between model generations.
• OEM part number: The surest way to confirm that the arm fits your exact vehicle.
• Front left or front right: Lower control arms are usually side-specific.
• Front or rear suspension: Some cars use control arms at the rear as well as the front.
• Suspension type: Standard, sport, adaptive, and air-sprung vehicles may each require a different arm.
• Engine version: Heavier engines may require a reinforced arm.
• Drivetrain (FWD, RWD, AWD): Different drivetrains may use different suspension geometry.
• Ball joint compatibility: Some arms include the ball joint, while others do not.
• Bushings included: Check whether the bushings are already pressed into the arm.
• Condition of bushings and ball joint: Perished bushings, joint play, or a torn boot indicate that the part is already worn.

Once the original listing opens, the condition of the arm is what matters.The casting almost never wears out, so what you are really buying is the rubber at one end and the ball joint at the other, and a used lower control arm is worth having only when both are sound.Work down this list:

• Photos: the bush rubber, the ball joint boot, and the whole arm side-on.
• Seller reputation: a dismantler that has traded for years and still has good recent feedback.
• Compatibility: the OEM number, the side, and the suspension type matched to your own.
• Included components: ball joint fitted, bushes fitted, or a bare arm?
• Condition: cracked or squashed bush rubber, a torn boot, a bent or scraped arm.
• Testing: word that the joint was levered for play and the bushes looked over.
• Warranty and returns: check the terms, because a bad bush costs you the alignment too.
• Shipping: long and heavy, so check the postage before you call it a bargain.
• Documentation: how many miles the donor car covered, since the rubber ages with it.

Add the alignment to the price before you decide, then place the order on that seller's marketplace.

The lower control arm price depends on the donor car, whether the arm is steel or aluminium, and how much of it comes in the box.A used steel arm off a common hatchback runs about €15-€45, an OEM aluminium arm with a sound ball joint and bushes €45-€110, and arms from premium or air-sprung models €110-€220.On Parthunt24 the cheapest arms begin at 5.00. What separates a cheap lower control arm from an expensive one:

• Material: aluminium arms cost more than pressed steel and corrode differently.
• What is included: an arm with the joint and bushes already in beats a bare casting.
• Suspension type: air-sprung and adaptive cars take dearer arms.
• Brand: factory-stamped arms are worth more than unbranded copies.
• Donor mileage: the rubber ages with the car, so a low-mileage arm is worth more.
• Model rarity: arms for high-volume models are plentiful, others much less so.

Sort by lower control arm price, add the alignment to whatever you find, and the cheapest arm for your side and suspension is easy to see.

The arm sets the angles the wheel sits at, so everything it touches is worth a look while the corner is apart. A lower control arm replacement also means paying for a wheel alignment, which makes this the moment to check the rest. Look at these on Parthunt24:

• Suspension control arm: the wider category, covering the arms at every corner of the car.
• Control arm: the same part under the name a lot of sellers list it as.
• Upper control arm: on double-wishbone cars, the arm above, which wears in the same way.
• Anti-roll bar: runs across the car and mounts to the arm itself on many models.
• Anti-roll bar link: joins that bar to the arm or strut, and knocks over bumps just like a bush.
• Ball joint: the arm's outer pivot, sold on its own where it is not built in.
• Wheel hub spindle knuckle: the casting the ball joint tapers into, worth checking for cracks.
• Wheel hub: bolts to that knuckle, so it is in your hands at the same time.

Tighten the inner bush bolts only once the car's weight is back on its wheels, or the rubber sits twisted and tears within months, and book the alignment before you drive it.

A clunk from one front corner normally turns into three phone calls and four different prices. Parthunt24 puts those prices on one screen instead: one search over Europe's largest used-parts marketplaces, every lower control arm for sale ranked in a single list, with the side, the bushes, and the price all on show.Parthunt24 holds no stock and takes no payment. The seller who wrote the advert keeps both, while Parthunt24 sets every offer beside every other, so the whole market reads across in a single glance.Filter down to your own car, supermini, estate, or four-wheel-drive, and the list resorts by lower control arm price. Compare prices, take the best deal on the page, and find the right lower control arm for your car today.