Control Arms Guide
Last updated: 24 April 2026
Control arms (wishbones) are critical suspension components that connect the wheel hub assembly to the vehicle chassis. They allow the wheels to move vertically over bumps while maintaining correct alignment and steering geometry. Worn control arm bushings or ball joints cause vague steering, uneven tyre wear, and clunking noises. We stock control arms from brands like Lemforder, Meyle, Febi, and TRW.
Signs of worn control arms
Control arm wear is gradual, so symptoms develop slowly. Most failures occur at the rubber bushings or ball joints rather than the arm itself.
- Clunking or knocking noises over bumps and potholes
- Steering wander — the car drifts left or right on a straight road
- Uneven or accelerated tyre wear on the inner or outer edge
- Vibration through the steering wheel at motorway speeds
- Failed MOT for excessive play in suspension joints
Choosing the right control arm
Control arms vary significantly between vehicles. Front-wheel-drive cars typically have upper and lower arms; multi-link rear suspensions may have four or more arms per side.
- Check whether you need the full arm assembly or just the bushing/ball joint
- Upper and lower control arms are not interchangeable — verify the position
- Some arms include the ball joint pre-fitted; others require separate purchase
- Aluminium arms (common on premium vehicles) are lighter but more expensive
- Always replace as an axle pair for balanced handling and alignment
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What control arms do, symptoms of worn bushings and ball joints, and when to replace them.
Related guides
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Worn anti-roll bar bushes cause clunks and body roll — polyurethane vs rubber, sizing, and fitting guide.
- Anti-Roll Bar Link Buying Guide
Knocking over bumps? Anti-roll bar drop link wear symptoms, replacement tips, and how they affect handling.
- Ball Joint Buying Guide
Clunking suspension and inspection failures — press-fit vs bolt-on ball joints, wear signs, and replacement advice.
- Boot and Bonnet Gas Strut Buying Guide
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Frequently Asked Questions
What is a control arm?
A control arm (wishbone) connects the wheel hub to the vehicle chassis and allows the suspension to move up and down while maintaining wheel alignment.
How do I know if my control arm is worn?
Clunking noises over bumps, wandering steering, uneven tyre wear, and vibration at speed are common symptoms of worn control arm bushings or ball joints.
Should I replace both control arms?
It's good practice to replace both sides of the same axle at the same time. If one has worn, the other is likely close behind.
Related Guides
Worn anti-roll bar bushes cause clunks and body roll — polyurethane vs rubber, sizing, and fitting guide.
Anti-Roll Bar Link Buying GuideKnocking over bumps? Anti-roll bar drop link wear symptoms, replacement tips, and how they affect handling.
Ball Joint Buying GuideClunking suspension and inspection failures — press-fit vs bolt-on ball joints, wear signs, and replacement advice.
Boot and Bonnet Gas Strut Buying GuideTailgate or bonnet not staying up? How to measure force rating, strut length, and ball-end fittings — and why cheap gas struts fail quickly.
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