Know about Camber Control Arm Replacement

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A control arm, also known as an A-arm, is a hinged suspension link between the chassis and the suspension upright or hub that carries the wheel.

If you search Rear contreol arm for BMW e36 on MaXpeedingRods, You will find these applications:

for E36 models 3-series 92-98: 318i, 318is, 318ic, 323i, 323ic, 323is, 325i, 325is, 325ic, 328i, 328is, 328ic, M3 (will not fit 318ti)
for E46 models 3-series 99-05: 323i, 323ci, 323cic, 325i, 325ci, 325cic, 325xi, 328i, 328ci, 328cic, 330i, 330ci, 330cic, M3
for E83 Models X3:2.5i, 2.5si, 3.0i, 3.0si through 2010
for E85 & E86 Models Z4: 2.5i, 2.5si, 3.0i, 3.0si, M-Roadster (will not fit M-Coupe)
for E89 Models Z4:  3oi, 35i, 35is 09-current

Replacing the control arm requires getting under the vehicle. Therefore, it is extremely important that the vehicle is properly raised and supported. Failure to properly support the vehicle can allow it to fall while working under it.

The vehicle must be on a flat surface (not on an incline) that is hard enough to support a jack and jack stand without them sinking into the surface. A concrete driveway is best. If the work is being done over dirt, the dirt needs to be dry and well compacted so that the jack stands cannot sink into it. A 1-foot square piece of plywood under the jack stands can help prevent any sinking.

Please note that it is not safe to work under a vehicle that is only supported by a jack. Hydraulic floor jacks bleed off their pressure through time, slowly dropping the vehicle. Scissor jacks and bottle jacks are unstable. If the car is bumped or tries to roll slightly, it can fall off these types of jacks.

The inboard (chassis) end of a control arm is attached by a single pivot, usually a rubber bushing. It can thus control the position of the outboard end in only a single degree of freedom, maintaining the radial distance from the inboard mount. Although not deliberately free to move, the single bushing does not control the arm from moving back and forth; this motion is constrained by a separate link or radius rod.

This is in contrast to the wishbone. Wishbones are triangular and have two widely spaced inboard bearings. These constrain the outboard end of the wishbone from moving back and forth, controlling two degrees of freedom, and without requiring additional links.

Most control arms form the lower link of a suspension. A few designs use them as the upper link, usually with a lower wishbone. The additional radius rod is then attached to the upper arm.

Control arms are most commonly encountered as part of the MacPherson strut independent front suspension. The control arms are perpendicular to the axis of the vehicle and are termed track control arms. A diagonal radius rod constrains the strut from moving forward and back.

In MacPherson's original design, an anti-roll bar also acted as the radius rod. This requires the bar to be attached through a ball joint, so as to also provide longitudinal control. In most contemporary designs, still commonly termed MacPherson struts, the radius rod and anti-roll bar are now separate, with the anti-roll bar mounted in a sliding bush.

Break loose the wheel lug nuts before jacking up the vehicle, but do not remove them. Block the rear wheels before jacking. This can be done with a stone, a scrap piece of dimensional lumber, or wheel chocks. The block or chock should be placed tightly behind the wheel so that the car cannot roll backward.

Using a floor jack or scissors jack, raise the vehicle high enough to allow working under it. Be sure to locate the jack on a frame member, or in the case of a car with a unibody construction, at a jacking point where there are several thicknesses of metal together to support the jack. Most modern cars have reinforced jacking points located right behind the front wheel wells for this purpose.

Most cars, even those with unibody construction, have a structural member for the control arm to connect to.  With the vehicle raised, the lug nuts can be removed and the wheel taken off. Place a jack stand under the vehicle, at a point where the frame or unibody construction is sufficiently strong to support the weight of the vehicle.  This is an excellent location for a jack stand, as long as the stand can be placed in such a way as to not interfere with removing the control arm.

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