Q: How do you remove and install the Lateral Arm and Trailing Arm on Hyundai Elantra?
A: Loosen the rear wheel lug nuts, raise the rear of the vehicle, and support it securely on jackstands before removing the wheels. For ABS-equipped models, remove the wheel speed sensors. On 2006 and earlier models, disconnect the parking brake cable from the trailing arm, remove the bolt attaching the rear end of the arm to the knuckle, and then remove the pivot bolt and nut from the forward end of the trailing arm before taking out the trailing arm. Installation is the reverse of removal; use a floor jack under the rear knuckle to raise the suspension to simulate normal ride height, then tighten the fasteners and lower the vehicle to tighten the lug nuts. For lateral arms, mark the relationship of the toe-in adjusting cams to preserve rear wheel alignment, remove the through-bolts attaching the outer ends of the lateral arms to the rear knuckle, and then remove the inner pivot nuts and bolts to take out the rear lateral arm. Installation follows the reverse order, ensuring alignment marks are matched before tightening. After completing the installation, drive the vehicle to an alignment shop for rear-wheel toe checking and adjustment. For 2017 and later 1.6L models and 2007 through 2012 2.0L models, remove the nuts and bolts from the upper arm, then remove the arm, ensuring the R stamped into the arm faces the rear during installation. For the lower arm, support it with a floor jack, disconnect the stabilizer bar link on 1.6L models, loosen the inner pivot bolt, and remove the outer bolt before lowering the jack to remove the coil spring. After removing the inner pivot bolt, reinstall by reversing the steps and tightening the fasteners. For the front (assist) arm on 2007 through 2012 models, remove the cotter pin and nut from the balljoint stud, detach the stabilizer bar link, and use a balljoint separator tool to detach the arm from the knuckle, marking the position of the inner cam bolt before removal. For 1.6L models, support the lower rear arm, remove the bolts/nuts, and reinstall by reversing the steps, using a new cotter pin if equipped. For the trailing arm, unhook the parking brake cable, detach the mounting bracket, and remove the mounting bolts to detach the rear of the trailing arm from the knuckle before removing the front pivot mounting bolts. Reinstallation follows the reverse order, ensuring all fasteners are tightened.