This procedure replaces the electronic parking brake actuator on the rear caliper assembly, requiring caliper removal and brake system bleeding.

Warnings

Tools required

Parts

• Electronic parking brake actuator × 1 — Use OEM Hyundai part number for specific caliper side
• Brake fluid × 1 — DOT 4 specification
• Copper crush washers for brake line × 2 — Use OEM specification

Fluids

• DOT 4 Brake Fluid — 1 qt

Preparation

1. Park vehicle on level ground and engage parking brake initially
2. Chock front wheels securely
3. Connect scan tool and verify communication with EPB system
4. Check battery voltage is above 12.4V with engine off
5. Loosen rear wheel lug nuts while vehicle is on ground (do not remove)
6. Raise rear of vehicle and support on jack stands rated for vehicle weight
7. Remove rear wheel on affected side
8. Place drain pan under work area to catch brake fluid
9. DO NOT press brake pedal once caliper is disconnected

Procedure

1. 1

   Retract electronic parking brake actuator
   Using scan tool, navigate to EPB service mode and select 'Retract Caliper Piston' or 'Service Mode On' for the affected rear caliper. The actuator motor will run and fully retract the piston. Wait for confirmation on scan tool that retraction is complete. This step is critical - forcing the piston without electronic retraction will damage the actuator.
   ⚠️Do not attempt to compress caliper piston without first retracting via scan tool. Manual compression will destroy the actuator mechanism.
2. 2

   Disconnect EPB actuator connector
   Locate the electrical connector on the EPB actuator mounted to the rear of the caliper. Press the release tab and carefully disconnect the wiring harness. Inspect connector pins for corrosion or damage. Clean if necessary with electrical contact cleaner.
   ⚠The connector release tab is fragile. Use controlled force to avoid breaking the tab.
3. 3

   Remove brake caliper from bracket
   Remove the two caliper slide pin bolts securing the caliper to the bracket. Use a socket wrench on the slide pin bolts. Once removed, carefully lift the caliper assembly (with actuator still attached) off the brake rotor. Support the caliper with a hanger or strong wire from the suspension - never let it hang by the brake hose.
   Torque spec

   Caliper Slide Pin Bolts35 Nm (26 lb-ft)
4. 4

   Disconnect brake hose from caliper
   Place a drain pan beneath the caliper. Using a flare nut wrench, carefully loosen and remove the brake hose banjo bolt from the caliper body. Remove the two copper crush washers (one on each side of the banjo fitting). Immediately plug the brake hose end with a rubber cap or clean shop rag to minimize fluid loss and prevent contamination. Allow caliper to drain into pan.
   ⚠️Brake fluid will drain rapidly once banjo bolt is removed. Ensure drain pan is positioned correctly. Avoid skin contact and clean up spills immediately.
   ⚠Use flare nut wrench to prevent rounding off the banjo bolt. Standard wrenches may slip and strip the fitting.
5. 5

   Remove EPB actuator from caliper
   With caliper on workbench, locate the two mounting bolts securing the EPB actuator to the rear of the caliper body. Remove these mounting bolts. Carefully separate the actuator from the caliper, noting the orientation and any alignment pins or guides. The actuator connects to the internal screw mechanism - pull straight back to disengage.
   ℹ️Take photos before removal to document correct actuator orientation and alignment for installation.
   Torque spec

   Mounting Bolts27 Nm (20 lb-ft)
6. 6

   Inspect caliper screw mechanism
   With actuator removed, inspect the caliper's internal screw mechanism for damage, corrosion, or debris. The screw should rotate smoothly. Clean the interface area with brake cleaner and a wire brush if needed. Check that the piston screw mechanism is not seized or damaged. If internal mechanism is damaged, the entire caliper must be replaced.
   ⚠If screw mechanism shows excessive wear, binding, or damage, replace the entire caliper assembly. Installing a new actuator on a damaged caliper will result in premature failure.
7. 7

   Install new EPB actuator to caliper
   Apply a thin coat of anti-seize compound to the actuator mounting bolts (not the threads engaging the caliper). Align the new actuator with the caliper screw mechanism, ensuring proper engagement of the drive gear with the internal screw. Press the actuator firmly onto the caliper body. Install and hand-tighten both mounting bolts, then torque to specification in a cross pattern.
   ⚠Verify the actuator gear properly engages the caliper screw before tightening bolts. Improper engagement will cause immediate failure when actuator is powered.
   Torque spec

   Mounting Bolts27 Nm (20 lb-ft)
8. 8

   Reinstall caliper and connect brake hose
   Using NEW copper crush washers on both sides of the banjo fitting, reconnect the brake hose to the caliper. Hand-tighten the banjo bolt, then torque to specification. Ensure the brake hose is not twisted and has proper clearance from suspension components and wheel. Position the caliper assembly over the brake rotor and onto the caliper bracket.
   ⚠️Always use new copper crush washers. Reusing old washers will cause brake fluid leaks and potential brake failure.
   ⚠Do not over-torque the banjo bolt. The copper washers are designed to crush and seal at proper torque. Over-torquing can crack the caliper body.
9. 9

   Secure caliper to bracket
   Clean the caliper slide pins with brake cleaner and inspect the rubber boots for tears or damage. Apply silicone brake grease to the slide pins as specified. Install both caliper slide pin bolts and torque to specification. Ensure caliper moves freely on the slide pins after installation.
   Torque spec

   Caliper Slide Pin Bolts35 Nm (26 lb-ft)
10. 10

    Reconnect EPB actuator electrical connector
    Reconnect the electrical connector to the new EPB actuator. Ensure the connector locks securely with an audible click. Route the wiring harness away from moving components and heat sources. Verify the connector is fully seated and weather seal is properly positioned.
    ℹ️Improper connector seating will cause EPB system faults and malfunction indicator lamp illumination.
11. 11

    Bleed rear brake circuit
    Fill master cylinder reservoir with fresh DOT 4 brake fluid to MAX line. Attach clear vinyl tubing to the rear caliper bleeder screw and route into a catch container. Have an assistant pump brake pedal 3-5 times and hold pressure. Open bleeder screw 1/2 turn, allow fluid and air to escape, then close bleeder screw before pedal reaches floor. Repeat until fluid flows clear without air bubbles. Torque bleeder screw to specification.
    ⚠️Do not allow master cylinder reservoir to run dry during bleeding. This will introduce air into the ABS system requiring professional scan tool bleeding.
    ⚠Bleeder screws are fragile. Do not over-tighten. Follow torque specification exactly.
    Torque spec

    Bleeder Screw10 Nm (7 lb-ft)
12. 12

    Initialize EPB actuator with scan tool
    Using the scan tool, select 'EPB Initialization' or 'Actuator Calibration' function for the serviced caliper. Follow scan tool prompts to run the actuator through its full range of motion. The actuator will extend and retract multiple times. This process teaches the system the new actuator's range. Wait for scan tool confirmation that initialization is complete. Check for any diagnostic trouble codes.
    ⚠️Do not skip initialization procedure. Un-initialized actuators will not apply parking brake correctly and may cause vehicle rollaway.
13. 13

    Install wheel and torque lug nuts
    Clean wheel mounting surface on hub with wire brush. Install wheel and hand-tighten all lug nuts in star pattern. Lower vehicle until tire just contacts ground (weight not fully on wheel). Torque lug nuts to specification in star pattern. Fully lower vehicle and torque lug nuts again in star pattern to verify proper torque.
    Torque spec

    Wheel Lug Nuts140 Nm (103 lb-ft)

Reassembly

1. Top off brake fluid reservoir to MAX line with fresh DOT 4 fluid
2. Verify brake fluid cap is secure and vent hole is clear
3. Clean any spilled brake fluid from vehicle surfaces immediately with water
4. Remove wheel chocks from front wheels
5. Double-check all brake line connections for leaks

Verification

• With engine running, pump brake pedal several times - pedal should feel firm and not sink slowly
• Test parking brake function: Pull EPB switch and verify parking brake applies firmly - should hold vehicle on moderate incline
• Release parking brake via switch and verify EPB indicator lamp extinguishes
• Verify no brake fluid leaks at caliper, banjo fitting, or bleeder screw
• Perform low-speed brake test in safe area - brakes should apply smoothly without pulling to one side
• Check for diagnostic trouble codes using scan tool - no EPB system faults should be present
• Test drive at various speeds and verify normal brake operation before returning to service
• Verify brake warning lamp and EPB indicator lamp function normally during startup and operation

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