Parking Brake Actuator

Replacement of an electric parking brake (EPB) actuator on the rear caliper of a 2024 Cybertruck Dual Motor. The EPB is integrated into the rear caliper — the actuator must be retracted via service mode before removal, and re-calibrated after installation.

Warnings

Tools required

Parts

• Rear parking brake actuator (EPB motor) × 1 — Tesla Cybertruck rear EPB actuator — refer to parts catalog for VIN-specific number
• Actuator-to-caliper O-ring/seal (if supplied separately) × 1 — OEM seal kit for EPB actuator
• Actuator mounting bolts (if single-use) × 3 — Per Tesla Service Manual — replace if specified

Preparation

1. Park on level ground, place in P, engage parking brake.
2. Exit ALL doors with key fob away from the vehicle. Wait at least 2 minutes for HV systems to fully de-energize, even on this non-HV job.
3. Disconnect the low-voltage battery (48V on Cybertruck — NOT 12V). Locate per Tesla Service Manual; use insulated tools and observe correct disconnect sequence.
4. DO NOT touch, cut, or pierce ANY orange cable — these are high-voltage (800V on Cybertruck) and lethal.
5. If at any point you encounter an orange cable, an HV component, or are unsure if a system is de-energized: STOP and consult a Tesla-certified technician.
6. Before disconnecting low-voltage power: enter the vehicle's service mode via the touchscreen and use the EPB service/retract function to fully open the parking brake actuator. Confirm the actuator is in the service position.
7. Engage Jack Mode (Controls → Service → Jack Mode) to disable air suspension self-leveling.
8. Loosen rear wheel lug nuts while vehicle is on the ground.
9. Raise the rear of the vehicle with a rated jack on a manufacturer-approved lift point and support on jack stands.
10. Remove the rear wheel on the side being serviced.

Procedure

1. 1

   Confirm EPB is in service position
   Verify via service mode / scan tool that the parking brake actuator has fully retracted. The actuator should spin freely or feel unloaded. If retraction failed, do not proceed — diagnose the EPB system first.
   ⚠️Removing a clamped/loaded EPB actuator can release stored spring force and damage the caliper or cause injury.
2. 2

   Locate and access the EPB actuator
   The EPB actuator is mounted to the rear of the rear brake caliper. Clean accumulated road debris from the caliper and actuator body with brake cleaner so the connector and fasteners are visible.
3. 3

   Disconnect the EPB electrical connector
   Release the connector lock tab and disconnect the wiring harness from the actuator. Inspect the connector and pins for corrosion or damage. Move the harness aside and secure it so it is not stressed during actuator removal.
   ⚠Cybertruck uses 48V LV architecture — do not back-probe or short connector pins.
4. 4

   Remove the actuator mounting fasteners
   Remove the bolts (typically three) securing the EPB actuator to the rear of the caliper body. Support the actuator as the last bolt is removed so it does not hang on internal components.
   Torque spec

   Mounting Bolts27 Nm (20 lb-ft)
5. 5

   Remove the actuator from the caliper
   Pull the actuator straight off the caliper. It should separate without prying. Note the orientation of the drive coupling between the actuator gear and the caliper spindle. Inspect the coupling and the caliper bore for wear, corrosion, or contamination.
   ⚠Do not rotate the caliper's internal spindle manually — doing so without service mode active can re-clamp the parking brake.
6. 6

   Inspect and clean the mating surface
   Wipe the caliper mating face clean. Inspect the sealing surface and the actuator-to-caliper seal/O-ring. Replace the seal if a new one is supplied with the actuator. Check the caliper for fluid leaks — if brake fluid is present at the actuator interface, the caliper must be replaced.
7. 7

   Install the new actuator
   Align the new actuator's drive coupling with the caliper spindle and seat the actuator squarely against the caliper. Do not force it — it should seat fully by hand once the coupling indexes.
8. 8

   Install and torque actuator mounting bolts
   Install the actuator mounting bolts. Apply medium-strength threadlocker if specified by the service manual. Tighten in a cross pattern in two passes to the specified torque.
   Torque spec

   Mounting Bolts27 Nm (20 lb-ft)
9. 9

   Reconnect the EPB harness
   Reconnect the electrical connector to the actuator and ensure the lock tab fully engages. Route the harness back into its original retainers.
10. 10

    Reinstall the wheel
    Mount the rear wheel and hand-thread the lug nuts. Lower the vehicle until the tire just contacts the ground, then torque lug nuts in a star pattern.
    Torque spec

    Wheel Lug Nuts140 Nm (103 lb-ft)
11. 11

    Repeat on opposite side if replacing both actuators
    If both rear actuators are being replaced, repeat steps 2–10 on the opposite rear caliper.
12. 12

    Reconnect low-voltage battery and exit Jack Mode
    Lower the vehicle fully. Reconnect the 48V low-voltage battery using the manufacturer-specified sequence. Wake the vehicle and exit Jack Mode via the touchscreen.
    ⚠After LV reconnect, the steer-by-wire system, air suspension, and ADAS may require self-calibration. Allow the vehicle to complete its initialization before driving.
13. 13

    Calibrate / reset the EPB
    Using service mode (or a compatible scan tool), exit EPB service mode and command a parking brake calibration / apply-release cycle. Verify no stored EPB DTCs remain. Repeat the apply/release cycle 2–3 times to set pad clearance.
    ⚠️Do NOT drive the vehicle until the EPB has been successfully calibrated and exits service mode — the parking brake may not function correctly.

Reassembly

1. Confirm all fasteners are torqued to specification.
2. Confirm wheel lug nuts torqued in star pattern to specification.
3. Verify EPB connector is fully seated and harness is routed clear of suspension and brake components.
4. Clear any DTCs related to the EPB system after calibration.
5. Re-torque lug nuts after 50–100 miles of driving.

Verification

• On the touchscreen, confirm no parking brake or chassis warnings are present.
• With the vehicle stationary on level ground, apply and release the parking brake several times — listen for the actuator running to a normal stop on each cycle (no grinding, no stall).
• Perform a low-speed roll test (in a safe area) and confirm the EPB holds the vehicle when applied and fully releases when commanded.
• Confirm Auto Hold and Hill Hold function normally after a short drive cycle.
• Recheck for fluid leaks at the caliper/actuator interface after first apply cycle.
• Reminder: Tesla recommends brake fluid replacement every 2 years regardless of mileage — if not recently performed, schedule it.

Related trouble codes on this vehicle

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