This procedure covers the removal and replacement of both upper and lower ball joints on the front suspension of a 2015 Kia Forte with 1.8L engine.

Warnings

Tools required

Parts

• Upper ball joint (left) × 1 — Use OEM specification
• Upper ball joint (right) × 1 — Use OEM specification
• Lower ball joint (left) × 1 — Use OEM specification
• Lower ball joint (right) × 1 — Use OEM specification
• Cotter pins × 4 — Appropriate size for ball joint castellated nuts
• Pinch bolt × 2 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Loosen front wheel lug nuts while vehicle is on ground
3. Raise front of vehicle and support securely on jack stands at manufacturer-approved lift points
4. Remove both front wheels
5. Spray all ball joint nuts, control arm bolts, and pinch bolts with penetrating oil and allow to soak
6. Take photos of suspension assembly for reference during reassembly

Procedure

1. 1

   Disconnect sway bar link
   Remove the sway bar link nut connecting to the lower control arm. Hold the shaft with an Allen key to prevent spinning while loosening the nut. This provides better access to the lower ball joint area.
   Torque spec

   Sway Bar Link Nuts55 Nm (41 lb-ft)
2. 2

   Remove lower ball joint pinch bolt
   Locate the pinch bolt that secures the lower ball joint to the steering knuckle. Remove this bolt completely and discard (new bolt required for reassembly). If corroded, use penetrating oil and a breaker bar. Note that this is a through-bolt that clamps the ball joint stud.
   ℹ️A new pinch bolt must be used during reassembly. Do not reuse the old bolt.
   Torque spec

   Pinch Bolt58 Nm (43 lb-ft)
3. 3

   Separate lower ball joint from knuckle
   Using a pry bar or ball joint separator, carefully separate the lower ball joint stud from the steering knuckle. Insert a pry bar into the pinch bolt gap and apply leverage to spread the knuckle opening. Tap the knuckle with a hammer if needed to break the taper free.
4. 4

   Remove upper ball joint cotter pin and nut
   Locate the upper ball joint castle nut on top of the steering knuckle. Use diagonal pliers to remove and discard the cotter pin. Using a socket and breaker bar, remove the castle nut from the upper ball joint stud. Keep the nut for reference if replacing with aftermarket parts.
   ℹ️New cotter pins must be installed during reassembly.
   Torque spec

   Ball Joint Nut97 Nm (71 lb-ft)
5. 5

   Separate upper ball joint from knuckle
   Use a ball joint separator tool or pickle fork to separate the upper ball joint stud from the steering knuckle. Position the separator between the knuckle and upper control arm, then strike with a hammer or tighten the separator screw until the taper breaks free. Support the knuckle assembly as it may drop when separated.
   ⚠Support the steering knuckle and brake assembly to prevent damage to brake hose and ABS wiring when ball joints are disconnected.
6. 6

   Remove control arms if necessary
   If ball joints are pressed into control arms (typical for this vehicle), remove the lower control arm by unbolting the control arm mounting bolts. For upper ball joint, access may require removing strut tower nuts from the engine bay to lower the strut assembly. Mark bolt positions for proper alignment during reassembly.
   ⚠Do not fully remove strut assembly unless necessary. Loosening strut tower nuts may allow strut to drop for upper ball joint access.
   Torque spec

   Control Arm Bolts165 Nm (122 lb-ft)

   Strut Tower Nuts50 Nm (37 lb-ft)
7. 7

   Press out old ball joints
   Using a ball joint press kit or appropriately sized C-clamp with adapters, press the old ball joints out of the control arms. Select the correct receiver cup that fits around the ball joint body and a driver that contacts only the ball joint housing (not the stud). Apply steady pressure until the ball joint is fully extracted. Clean the control arm bore with a wire brush.
   ⚠Ensure press adapters are properly aligned to avoid damaging control arm bores. Misalignment can crack or deform the control arm.
8. 8

   Press in new ball joints
   Position the new ball joint in the control arm bore with the correct orientation (grease fitting accessible, stud pointing in correct direction). Using the ball joint press with appropriate adapters, press the new ball joint into the control arm until it is fully seated. Apply pressure only to the ball joint outer housing, never the stud. Verify the ball joint is seated completely and flush with the control arm surface.
   ⚠Press only on the ball joint housing. Applying force to the stud will damage the internal components and ruin the new ball joint.
9. 9

   Reinstall control arms and strut components
   Reinstall the lower control arm to the subframe with mounting bolts hand-tight only (final torque will be applied with vehicle weight on suspension). If strut was loosened, reposition and install strut tower nuts. Ensure all components are properly aligned before tightening.
   ℹ️Do NOT torque control arm bolts at this time. These must be torqued with vehicle weight on the suspension.
   Torque spec

   Strut Tower Nuts50 Nm (37 lb-ft)
10. 10

    Connect ball joints to steering knuckle
    Raise the steering knuckle assembly into position. Insert the upper ball joint stud through the knuckle and install the castle nut, torquing to specification. Align the castle nut slots with the stud hole and install a new cotter pin, bending the ends to secure. For the lower ball joint, insert the stud into the knuckle pinch clamp and install a NEW pinch bolt, torquing to specification.
    ℹ️If castle nut slots do not align with cotter pin hole at specified torque, tighten further to the next slot alignment. Never loosen to align.
    Torque spec

    Ball Joint Nut97 Nm (71 lb-ft)

    Pinch Bolt58 Nm (43 lb-ft)
11. 11

    Reconnect sway bar link
    Reconnect the sway bar link to the lower control arm. Hold the shaft with an Allen key and tighten the nut to specification.
    Torque spec

    Sway Bar Link Nuts55 Nm (41 lb-ft)
12. 12

    Install wheels and lower vehicle
    Install both front wheels and hand-tighten lug nuts in a star pattern. Lower the vehicle until the tires just contact the ground but the suspension is not yet fully loaded. This is the critical stage for final torquing.
13. 13

    Final torque with vehicle weight on suspension
    With the vehicle lowered so suspension is at normal ride height (weight on wheels but vehicle still supported for safety), torque the control arm mounting bolts to specification. This ensures proper bushing alignment and prevents premature wear. Then fully lower the vehicle and torque wheel lug nuts in a star pattern to specification.
    ⚠Control arm bolts MUST be torqued at normal ride height. Torquing with suspension hanging will twist bushings and cause premature failure.
    Torque spec

    Control Arm Bolts165 Nm (122 lb-ft)

    Wheel Lug Nuts129 Nm (95 lb-ft)

Reassembly

1. Ensure all new cotter pins are properly installed and bent to prevent loosening
2. Verify all torque specifications have been met, especially control arm bolts at ride height
3. Check that ball joint boots are not torn or twisted during installation

Verification

• Test drive the vehicle at low speed and verify no clunking or knocking noises from suspension
• Perform a visual inspection underneath to confirm all fasteners are tight and cotter pins are secure
• Check for any unusual tire wear patterns after 50-100 miles of driving
• Have a professional alignment performed immediately after ball joint replacement to prevent tire wear and ensure proper handling

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