| Brand | Car Name | Model | Year | Position |
|---|---|---|---|---|
| Honda | Cr-V 2.0 | — | 1999-2002 | LOWER ARM LH |
A control arm is the A-shaped or L-shaped link that connects the front wheel hub carrier (steering knuckle) to the vehicle's chassis or subframe, allowing the wheel to rise and fall with the road surface while remaining under lateral and longitudinal control. Every independent front suspension design uses at least one control arm per side; some double-wishbone and multi-link designs use two — an upper and a lower — while the MacPherson strut layout uses only a lower control arm, relying on the strut itself to handle the upper location.
Also known as: wishbone, A-arm, track control arm (TCA), lateral link. The lower control arm is sometimes called the lower wishbone; the upper is the upper wishbone or upper A-arm. In multi-link rear suspensions the equivalent links may be called lateral arms or trailing arms, though those are distinct part numbers.
The control arm has two mounting points to the chassis — both with rubber or polyurethane bushings that absorb vibration — and one outer ball joint that connects to the steering knuckle. This three-point mounting allows the knuckle to pivot for steering while the arm swings up and down through suspension travel, keeping the wheel in the correct plane throughout its arc.
The geometry of the control arm determines how camber and caster angles change as the suspension compresses and extends. A well-designed arm keeps negative camber gain through bump, improving cornering grip. Engineers use the arm length and mounting angles to set the roll center height, which governs how much the body rolls in corners relative to wheel load transfer.
In a MacPherson strut system the single lower control arm handles all lateral and longitudinal forces while the strut bearing takes the vertical load. In a double-wishbone system both arms share the load and offer finer geometry control, which is why performance cars and heavy SUVs favour the double-wishbone layout despite its greater complexity and cost.
Control arms are manufactured from forged steel (grades 1045 or 4140 for high-strength applications), stamped steel, or forged aluminium on weight-sensitive unibody platforms. The outer end houses a press-in or integral ball joint sealed with a neoprene or polyurethane dust boot. The inner ends carry rubber or polyurethane bushings pressed into cylindrical sleeves, which are pinched by bolts through the subframe. Bushing material controls NVH: rubber is quieter; polyurethane is stiffer and longer-lived but transmits more road noise. MOOG, TRW, 555 and CTR supply complete arm-and-ball-joint assemblies as well as bare arms for press-in servicing.
How long do control arms last?
Under normal paved-road use, the arm itself can last the vehicle's lifetime. The bushings inside the arm are the wear item and typically need replacement every 100,000–200,000 km, while the ball joint at the outer end may last 120,000–250,000 km. Rough roads, salt corrosion and off-road use shorten both service intervals significantly.
Should I replace the bushings alone, or the whole control arm?
On most modern control arms the bushings are pressed in and can be replaced separately with a hydraulic press. However, once the arm itself has been bent by a kerb or pothole impact, or if the ball joint is also worn, replacing the complete assembly is more cost-effective and ensures all three contact points are new. Many reputable suppliers — including MOOG and TRW — sell the complete arm-and-ball-joint assembly for this reason.
Do I need a wheel alignment after replacing a control arm?
Yes — a four-wheel alignment is mandatory. Removing the control arm changes the ball-joint position and therefore the caster, camber and toe angles on that corner. Even a dimensionally identical replacement part must be aligned to factory specification before the vehicle is driven.
Should I replace both sides at the same time?
For bushings, yes — they age together and asymmetric bushing stiffness creates handling imbalance. For the arm itself, replace only the damaged or worn unit unless the vehicle has high mileage and the second side is close to the end of its service life.
Is it safe to drive with a worn control arm?
A failed bushing makes the vehicle difficult to control and causes rapid tire wear, but it rarely causes sudden complete failure. A failed ball joint at the outer end is immediately dangerous — it can allow the wheel to collapse outward without warning, causing loss of steering control. Replace immediately once ball-joint play is detected.
Which vehicles use control arms?
Every vehicle with independent suspension uses control arms of one form or another. MacPherson strut layouts (the majority of modern front-wheel-drive cars and compact SUVs) use one lower control arm per side. Double-wishbone layouts (Honda CR-V Gen 1–2, Nissan Patrol, Mitsubishi Pajero, most rear-wheel-drive sports cars and trucks) use both an upper and a lower arm per side. Multi-link rear suspensions use several lateral arms that are functionally equivalent.
No. This is an aftermarket replacement manufactured by SLOOP, designed to meet OEM specifications. The OE number SA-BT024-L is referenced under nominative fair use solely to identify vehicle compatibility — it does not imply licensing, endorsement, or affiliation with any vehicle manufacturer. For genuine OEM parts, contact your authorized dealer.
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