In order to get the upper control arms off, begin by taking out the wheel trim or the hub cap and loosening the wheel bolts when on the wheels. Set chocks on the back wheels, engage the parking brake and get the vehicle up in the air and rest on jackstands and then remove the wheel. In case of vehicles that have an automatic leveling headlamp, remove the vehicle level sensor connector, to the front lower control arm. Unscrew the harness of the ABS wheel speed sensor and the brake caliper and unscrew the clamp bolt at the top of the steering knuckle and detach the balljoints, being careful not to rupture the rubber boots. Installation Take the shock absorber and coil spring assembly out, and by loosening and removing the nut and bolt attaching the upper control arm to the mounting bracket. Wipe the arm down and inspect to detect any wear or damage especially on the inner pivot bushing and balljoint which cannot be replaced independently. In case of any inner pivot bushing replacement, it must be pressed by a hydraulic press and has to be performed by a machine shop. Installation instructions: To install, put the control arm on the mounting bracket, insert a new securing bolt and nut, and be sure that both upper control arms are in the correct vertical distance, and tighten the securing nut to the desired torque values. Install the shock absorber coil spring assembly, reattach the upper control arm balljoints and fix the ABS wheel speed sensor. Use the outer control arm ends to bring the ride height to normal then tighten the shock absorber lower mounting nut, and then fit the wheel and cinch the bolts. Lastly, perform a check and adjust the alignment of the front wheel as required. In the case of the rear lower control arm, the loosening of the wheel bolts, chocking the rear wheels and lifting the front of the vehicle are required before the wheel is removed. This is to be done by removing the ABS wheel speed sensor and brake caliper then disconnecting the control arm and steering knuckle and removing the nut of the inner end of the control arm and the subframe needs to be lowered slightly to draw the control arm inner pivot bolt. Wipe the arm and examine the arm to check on any damages, and the inner pivot bushing is also necessary to be changed by hydraulic press. The process is the reverse of removal with installation being done with new nuts and bolts and all the fasteners tightened to the required torque values. In the case of the front lower control arm, it is important to support the engine in case of necessity, loosen the wheel bolts and lift the front of the car then take out the wheel. Disconnect vehicle level sensor when present, support steering knuckle and disconnect control arm- steering knuckle and shock absorber. Wash down the arm and inspect the damage, especially those of the bushings and balljoint, which are not replaceable individually. The replacement of the bushings needs a hydraulic press. Installation is the opposite of removal and the installation of the new nuts and bolts should be secured ensuring that the fasteners are tightened according to the recommended torque values and finally the front end alignment should be checked and adjusted where necessary.