Electronic Parking Brake Motor

Replace the electronic parking brake (EPB) motor/actuator on the rear brake caliper, requiring caliper removal, electrical disconnection, and system recalibration.

Warnings

Tools required

Parts

• Electronic parking brake motor/actuator × 1 — Use OEM specification
• EPB motor O-ring/seal (if not included with motor) × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and place wheel chocks at front wheels.
2. Ensure ignition is OFF but do NOT disconnect battery yet (needed for EPB retraction).
3. Verify you have a compatible diagnostic scanner with EPB service/retract function before beginning.
4. Loosen rear wheel lug nuts while vehicle is on ground.
5. Raise rear of vehicle and secure on jack stands at manufacturer-specified lift points.
6. Remove rear wheel on side requiring EPB motor replacement.

Procedure

1. 1

   Electronically retract EPB caliper piston
   Connect OBD-II diagnostic scanner to vehicle. Turn ignition to ON position (do not start engine). Navigate to EPB service mode or maintenance mode. Select the specific rear caliper being serviced. Initiate EPB retract/service mode function. The motor will retract the caliper piston fully. Wait for confirmation that retraction is complete (typically 30-60 seconds). Leave scanner connected and ignition ON throughout removal process.
2. 2

   Remove brake caliper from bracket
   Locate the two caliper slide pin bolts securing the caliper to the bracket. Remove both slide pin bolts. Carefully lift caliper off brake rotor and pads. Support caliper with wire or bungee cord to avoid stressing the brake hose - do not let it hang by the hose. The brake pads may remain in the bracket or come out with the caliper.
   Torque spec

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

   Disconnect EPB motor electrical connector
   Locate the electrical connector on the EPB motor (typically on rear or top of caliper). Press the release tab and carefully disconnect the electrical connector from the motor. Inspect connector pins for corrosion or damage. Set connector aside where it will not be contaminated with brake dust or fluid.
4. 4

   Remove EPB motor from caliper
   Locate the mounting bolts securing the EPB motor to the rear brake caliper (typically 2 bolts). Remove the EPB motor mounting bolts and carefully pull the motor straight out from the caliper housing. The motor will disengage from the caliper piston mechanism. Inspect the O-ring or seal on the motor mounting surface.
   ⚠Do not rotate or force the motor during removal. The motor spindle interfaces with the piston mechanism and must be withdrawn straight out.
   Torque spec

   Mounting Bolts28 Nm (21 lb-ft)
5. 5

   Clean caliper mounting surface
   Clean the EPB motor mounting surface on the caliper using brake cleaner and a wire brush. Remove all old seal material, brake dust, and corrosion. Ensure the mounting surface is clean and flat. Inspect the caliper piston mechanism opening for damage or debris.
6. 6

   Install new EPB motor O-ring
   Install the new O-ring or seal onto the new EPB motor (if not pre-installed). Lightly lubricate the O-ring with clean brake fluid to ease installation. Ensure the O-ring is properly seated in its groove on the motor housing.
7. 7

   Install new EPB motor
   Align the new EPB motor spindle with the caliper piston mechanism opening. Carefully insert the motor straight into the caliper housing, ensuring proper engagement with the piston mechanism. The motor should seat flush against the caliper. Apply medium-strength thread locker to the mounting bolts. Install and torque the mounting bolts to specification.
   ⚠Ensure motor spindle is properly aligned and engaged before tightening bolts. Improper engagement will cause EPB malfunction.
   Torque spec

   Mounting Bolts28 Nm (21 lb-ft)
8. 8

   Reconnect electrical connector
   Reconnect the electrical connector to the new EPB motor. Ensure it clicks firmly into place and the locking tab engages. Gently pull on connector to verify secure connection.
9. 9

   Reinstall brake caliper
   If brake pads were removed, reinstall them in the caliper bracket. Apply silicone brake grease to the caliper slide pins (if not already lubricated). Position the caliper over the brake rotor and pads. Align the slide pins with the bracket holes. Apply thread locker to slide pin bolts. Install and torque the caliper slide pin bolts to specification.
   Torque spec

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

    Calibrate and test EPB motor
    Using the diagnostic scanner, exit service mode. Select EPB calibration or initialization function for the replaced motor. Follow scanner prompts to calibrate the new motor (this typically involves automated apply/release cycles). Wait for successful calibration confirmation. The motor will make operational sounds during this process. Verify no fault codes are present after calibration.
    ⚠️Do not place hands or objects near caliper during calibration. The motor will move the piston and apply clamping force automatically.
11. 11

    Reinstall wheel and lower vehicle
    Reinstall the rear wheel. Hand-tighten all lug nuts in a star pattern. Lower vehicle until tire just contacts ground but weight is still on jack stands. Torque lug nuts to specification in a star pattern. Fully lower vehicle and remove jack stands.
    Torque spec

    Wheel Lug Nuts140 Nm (103 lb-ft)
12. 12

    Final EPB system verification
    Turn ignition to ON position. Disconnect diagnostic scanner. Apply the electronic parking brake using the dash switch and verify the system engages (check for warning lights and motor operation sound). Release the parking brake and verify proper release. Perform 3-5 apply/release cycles to ensure proper operation. Check for any EPB warning lights on the instrument cluster.

Reassembly

1. Reassembly is covered in the main procedure steps.
2. Ensure all electrical connections are secure and protected from water intrusion.
3. Verify brake pedal feels firm before moving vehicle.
4. If battery was disconnected at any point, reset clock and radio presets.

Verification

• With vehicle on level ground and engine running, apply electronic parking brake - vehicle should not roll when transmission placed in neutral.
• Release EPB and verify complete release (no drag on rear wheels when rotated by hand).
• Check instrument cluster for any EPB warning lights or fault messages.
• Test drive vehicle in safe area at low speed, performing several parking brake applications and releases.
• Verify normal service brake operation is not affected.
• Perform final diagnostic scan to confirm no stored EPB fault codes.
• On incline (if available), verify parking brake holds vehicle securely without rolling.

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