Replace the electronic parking brake motor on the rear brake caliper, typically required when the parking brake fails to engage or disengage properly.

Warnings

Tools required

Parts

• Electronic parking brake motor assembly × 1 — 47750-02030 or equivalent OEM
• Electronic parking brake motor gasket/seal × 1 — Use OEM specification

Preparation

1. Ensure vehicle is on level ground with transmission in Park and engine off
2. Place wheel chocks in front of the front wheels
3. Connect OBD-II scan tool and verify communication with EPB control module
4. DO NOT disconnect the 12V battery - power is required for electronic parking brake service functions
5. Loosen rear wheel lug nuts 1/4 turn while vehicle is on ground
6. Raise rear of vehicle using floor jack and support securely on jack stands at manufacturer-specified lift points
7. Remove rear wheel completely
8. Spray brake caliper mounting hardware with penetrating oil and allow 10 minutes to soak

Procedure

1. 1

   Enter Electronic Parking Brake Service Mode
   Using the scan tool, navigate to the EPB control module and select 'Service Mode' or 'Maintenance Mode'. Follow on-screen prompts to retract the parking brake motor and caliper piston fully. The system will display confirmation when the motor is in the service position. This step is CRITICAL - do not proceed until confirmation is received.
   ⚠️Attempting to remove the EPB motor without entering service mode will damage the motor and caliper assembly, potentially causing complete brake failure.
2. 2

   Remove Brake Caliper
   Remove the two caliper slide pin bolts securing the caliper to the bracket. Support the caliper with wire or a bungee cord - do NOT let it hang by the brake hose. Move caliper aside to access the EPB motor.
   ⚠Never allow the brake caliper to hang unsupported by the flexible brake hose - this can damage the hose internally causing brake failure.
   Torque spec

   Caliper Slide Pin Bolts35 Nm (26 lb-ft)
3. 3

   Disconnect EPB Motor Electrical Connector
   Locate the electrical connector on the back of the electronic parking brake motor. Press the release tab and carefully pull the connector straight off the motor. Inspect connector terminals for corrosion or damage - clean if necessary with electrical contact cleaner.
   ⚠Do not pull on wires - grasp only the connector body. Damaged wiring can cause parking brake malfunction.
4. 4

   Remove EPB Motor Mounting Bolts
   Remove the two EPB motor mounting bolts (typically 10mm) securing the motor to the rear of the brake caliper. Note the position of any washers or spacers for reinstallation. Keep bolts organized.
   Torque spec

   Mounting Bolts26 Nm (19 lb-ft)
5. 5

   Remove Electronic Parking Brake Motor
   Carefully pull the EPB motor assembly straight away from the caliper body. The motor shaft is connected to the caliper piston mechanism - pull steadily without twisting. Remove and discard the old gasket/seal from the motor mounting surface on the caliper.
   ⚠Do not rotate or twist the motor during removal as this can damage the internal gear mechanism in the caliper piston.
6. 6

   Clean Mounting Surfaces
   Use brake cleaner and a wire brush to thoroughly clean the EPB motor mounting surface on the caliper. Remove all old gasket material, corrosion, and debris. Ensure the mating surface is completely clean and dry before installation. Inspect the caliper piston mechanism through the motor opening for any damage or debris.
   ℹ️Any debris between the motor and caliper can cause improper sealing and parking brake malfunction.
7. 7

   Install New Gasket and Position New Motor
   Place the new gasket/seal onto the EPB motor mounting surface. Align the new EPB motor shaft with the caliper piston mechanism. Ensure the motor is oriented correctly - the electrical connector should face the same direction as the original. Carefully push the motor straight onto the caliper until it seats fully against the gasket.
   ⚠Verify correct motor orientation before installation. Incorrect installation can damage the internal gear mechanism.
8. 8

   Install EPB Motor Mounting Bolts
   Install the two EPB motor mounting bolts with any washers or spacers in their original positions. Thread bolts by hand first to avoid cross-threading. Tighten bolts gradually in a cross pattern to the specified torque of 26.0 Nm (19 lb-ft). Verify the motor is seated evenly and securely.
   Torque spec

   Mounting Bolts26 Nm (19 lb-ft)
9. 9

   Reconnect EPB Motor Electrical Connector
   Reconnect the electrical connector to the EPB motor, ensuring it clicks fully into place. Gently tug on the connector to verify it is locked. Ensure wiring is routed away from any moving parts, hot surfaces, or sharp edges.
10. 10

    Reinstall Brake Caliper
    Position the brake caliper back over the brake pads and rotor. Clean the caliper slide pin bolts and apply a thin coat of silicone brake grease to the smooth portion of each bolt (not the threads). Install and tighten the caliper slide pin bolts to 35.0 Nm (26 lb-ft) torque specification.
    Torque spec

    Caliper Slide Pin Bolts35 Nm (26 lb-ft)
11. 11

    Exit Service Mode and Calibrate EPB System
    Using the scan tool, exit EPB service mode. The system will extend the parking brake motor to re-engage the mechanism. Follow the scan tool prompts to perform EPB calibration/initialization. This process typically takes 30-60 seconds and may make audible motor noises. Wait for confirmation that calibration is complete and successful.
    ⚠️EPB calibration must complete successfully before the vehicle is driven. Incomplete calibration can result in parking brake failure.
12. 12

    Reinstall Wheel and Lower Vehicle
    Reinstall the rear wheel, threading lug nuts by hand first. Tighten lug nuts in a star pattern to finger-tight. Lower the vehicle until the tire just contacts the ground. Torque lug nuts to 140.0 Nm (103 lb-ft) in a star pattern. Fully lower vehicle and remove jack stands.
    Torque spec

    Wheel Lug Nuts140 Nm (103 lb-ft)

Reassembly

1. Verify all tools and parts have been removed from the work area
2. Double-check that the EPB motor electrical connector is fully seated and secured
3. Confirm lug nuts are properly torqued in star pattern
4. Remove wheel chocks from front wheels

Verification

• With engine running and brake pedal depressed, engage the electronic parking brake using the dashboard switch - verify motor operates smoothly and parking brake applies fully within 2-3 seconds
• Release the electronic parking brake using the switch - verify motor releases smoothly and indicator light extinguishes
• Perform at least 3 apply/release cycles to confirm consistent operation
• With vehicle on level ground in Neutral (foot on brake), verify parking brake holds the vehicle stationary when engaged
• Test drive vehicle at low speed (5-10 mph in empty parking lot) and verify normal service brake operation is not affected
• Use scan tool to check for any stored diagnostic trouble codes in the EPB system - clear and verify none return
• Verify parking brake warning light functions correctly on dashboard during apply/release cycles
• Road test vehicle and perform several gentle stops to verify proper brake function before returning to normal service

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