Replacement of the electronic parking brake (EPB) motor on a 2024 Tesla Model Y Long Range AWD rear caliper. The EPB motor is a serviceable actuator bolted to the rear caliper housing; the job requires retracting the EPB via service mode before mechanical removal.

Warnings

Tools required

Parts

• Electronic Parking Brake Motor (rear caliper actuator) × 1 — Manufacturer-specified EPB actuator for 2024 Model Y rear caliper — verify left/right side
• EPB motor mounting bolts (if supplied with new actuator or single-use) × 1 — Per OEM specification

Preparation

1. Park on level ground, place in P, engage parking brake.
2. Exit ALL doors with the 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. Before disconnecting 12V: enter the touchscreen Service Mode and place the EPB into 'Service Mode' / 'Brake Service' to fully retract the parking brake actuator. Confirm retraction completed without faults.
4. Disconnect the 12V low-voltage battery. On 2024 Model Y, the 12V battery is located beneath the rear cargo area trim panel — refer to architecture notes. Wait 2 minutes after disconnect before proceeding.
5. DO NOT touch, cut, or pierce ANY orange cable — these are high-voltage and lethal.
6. 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.
7. Loosen rear wheel lug nuts slightly while the vehicle is on the ground.
8. Raise the rear of the vehicle at the manufacturer-specified jacking points (use Tesla puck adapters to protect the battery pack pinch welds) and support on jack stands.
9. Remove the rear wheel on the affected side.
10. Verify which side (LH/RH) the new EPB motor corresponds to — they are side-specific.

Procedure

1. 1

   Confirm EPB is in Service Mode
   Before any mechanical work, re-confirm via the touchscreen that the EPB actuator is fully retracted and Service Mode is active. The motor must not be energized when disconnecting it. If you cannot confirm Service Mode (e.g., 12V already disconnected), do not proceed — reconnect 12V and run the retraction routine first.
   ⚠️Skipping Service Mode can cause the motor to spring-load against the caliper, making removal dangerous and risking injury when the actuator releases.
2. 2

   Locate and disconnect the EPB motor electrical connector
   Trace the small two-wire harness from the rear of the caliper EPB actuator to its connector, typically secured to a bracket on the trailing arm or knuckle. Release the harness retainers, depress the connector lock tab, and unplug. Inspect the connector pins for corrosion or moisture intrusion.
3. 3

   Inspect caliper and rotor area
   Visually inspect the caliper, rotor, and pads. If the caliper shows signs of fluid leakage or piston seizure, the EPB motor may not be the root cause — address those issues before continuing. Clean debris from around the EPB actuator housing so it does not enter the caliper when the motor is removed.
   ⚠Do not open any brake hydraulic line during this job — the EPB motor is mechanically driven and replacement should not require bleeding the brakes.
4. 4

   Remove the EPB motor mounting bolts
   The EPB motor (actuator) is fastened to the rear of the caliper body with several small bolts (typically Torx). Loosen each bolt evenly in a cross pattern to relieve any preload from the internal spring, then remove fully. Support the actuator as the last bolt is removed.
   ⚠If the actuator does not come free with light pressure after bolts are out, STOP — it may not be in Service Mode. Forcing it can damage the caliper spindle.
   Torque spec

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

   Remove the EPB motor from the caliper
   Pull the actuator straight off the caliper. Inspect the gear interface and the caliper-side spindle/drive coupling for damage, debris, or water intrusion. Note the orientation of the drive coupling — the new motor must engage it correctly.
6. 6

   Inspect and clean the caliper interface
   Wipe the caliper mating surface clean. Check the O-ring/seal area for the new actuator — most replacement EPB motors come with a new seal. If a separate seal is supplied, install it now. Confirm the caliper drive shaft rotates freely by hand (with appropriate tool if needed) — binding indicates a caliper-side problem, not motor-side.
7. 7

   Install the new EPB motor
   Align the new actuator's drive coupling to the caliper spindle and seat the actuator squarely against the caliper body. Hand-start all mounting bolts before torquing — do not pull the actuator down with the bolts, as this can crack the housing or pinch the seal.
   ⚠Tighten the mounting bolts evenly in a cross pattern in two passes to avoid distorting the actuator housing.
   Torque spec

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

   Torque EPB motor mounting bolts
   Final-torque the EPB motor mounting bolts to the verified specification using a calibrated torque wrench. If the new bolts are supplied with pre-applied threadlocker, do not add additional threadlocker.
   Torque spec

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

   Reconnect the EPB electrical connector
   Apply a light film of dielectric grease to the connector seal (not the pins), reconnect the harness, ensure the lock tab fully engages, and reseat any harness retainers along the trailing arm. Verify routing keeps the harness clear of the rotor, half-shaft, and suspension travel.
10. 10

    If both rear EPB motors are being serviced, repeat on the opposite side
    Many shops replace both EPB actuators as a pair when one fails due to similar age/exposure. Repeat steps 2–9 on the opposite rear caliper if applicable.

Reassembly

1. Reinstall the rear wheel. Hand-thread all lug nuts before lowering.
2. Lower the vehicle until the tire just contacts the ground, then torque the lug nuts in a star pattern to specification.
3. Lower the vehicle fully.
4. Reconnect the 12V low-voltage battery (negative last). Allow the vehicle's systems to fully wake.
5. Power on the vehicle. Expect EPB and possibly ABS/ESC warning lights initially — they should clear after the calibration routine.
6. Enter Service Mode on the touchscreen. Exit EPB Service Mode / run the EPB calibration or actuation routine to extend the new actuator and verify both apply and release function.
7. Clear any stored DTCs related to the EPB after a successful calibration.

Verification

• With the vehicle stationary on level ground, apply and release the parking brake from the touchscreen and confirm audible/feel actuation on the serviced side.
• Confirm no EPB, ABS, traction control, or Autopilot-disabled warnings remain on the instrument cluster after a key cycle.
• Perform a low-speed roll test (in a safe area) and apply the parking brake — vehicle should come to a controlled stop and hold on a slight grade.
• Inspect the new actuator and harness routing after the test for any leaks, looseness, or rubbing.
• Recheck wheel lug torque after 50 miles (Tesla recommendation for any wheel-off service).
• Note: While the wheel is off, this is a good time to verify brake fluid age — Tesla recommends brake fluid replacement every 2 years regardless of mileage. Inspect tire wear pattern as well; rotation is recommended every 6,250 mi on Model Y due to high curb weight and instant torque.

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