Replacement of the parking brake actuator on the 2024 Tesla Roadster Tri Motor. Note: this vehicle is a low-volume, low-confidence platform with limited public service data — much of the chassis hardware differs from mainstream Tesla models. Verify all specifics against the official Tesla Service Manual before proceeding.

Warnings

Tools required

Parts

• Parking brake actuator assembly (manufacturer-specified for 2024 Roadster Tri Motor) × 1 — Refer to Tesla Service Manual / EPC for correct part number
• Actuator mounting hardware (if supplied as one-time-use) × 1 — OEM specification

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 12V (or 16V/48V on applicable models) low-voltage battery per the Tesla Service Manual location for this model.
4. DO NOT touch, cut, or pierce ANY orange cable — these are high-voltage 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 12V power: connect Tesla diagnostic software and command the parking brake actuator into Service / Maintenance Mode to fully retract the actuator piston. Confirm retraction completed successfully.
7. Chock the front wheels and raise the rear of the vehicle on a lift or jack stands rated for the vehicle's weight. Verify stable support before going underneath.
8. Remove the rear wheels to gain access to the rear calipers (the parking brake is integrated into the rear caliper assembly on this platform).
9. Have shop towels and brake cleaner ready to manage any residual brake fluid weep at the caliper.

Procedure

1. 1

   Confirm actuator is in service mode
   Verify via the diagnostic tool that the EPB actuator on the affected corner is fully retracted and de-energized. Do not proceed with mechanical removal until confirmed — the actuator can otherwise be under load.
   ⚠️Skipping the service-mode retraction can cause sudden mechanical release and serious hand injury.
2. 2

   Locate and access the parking brake actuator
   Identify the electric parking brake actuator mounted to the rear caliper body. Clean the surrounding area with brake cleaner so debris does not fall into the caliper or actuator interface during removal. Trace the actuator's electrical harness back to its inline connector and note the routing for reinstallation.
3. 3

   Disconnect the actuator electrical connector
   Release the locking tab on the actuator's electrical connector and disconnect it. Inspect the connector pins for corrosion or damage. Protect the harness end with a clean shop towel or cap to prevent contamination.
4. 4

   Remove the actuator mounting fasteners
   Remove the fasteners securing the parking brake actuator to the caliper body. Support the actuator by hand as the last fastener is removed so it does not hang from the harness or fall. Note the orientation and any shims, gaskets, or O-ring seals between the actuator and caliper.
   ⚠Do not pry aggressively against the caliper body. If the actuator is stuck, gently rock it free — damage to the caliper sealing surface will require caliper replacement.
   Torque spec

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

   Remove the actuator from the caliper
   Withdraw the actuator straight off its mounting interface. Inspect the drive coupling / spindle interface between the actuator and the caliper's internal screw mechanism for wear, contamination, or damage. If the caliper-side spindle is damaged, the caliper must be addressed before installing a new actuator.
6. 6

   Inspect and prepare the mating surface
   Clean the caliper-side mounting surface with brake cleaner. Inspect the sealing O-ring or gasket area. If the new actuator does not include a pre-installed seal, fit the manufacturer-specified seal. Do not use silicone or RTV on this interface unless explicitly specified.
7. 7

   Install the new parking brake actuator
   Align the new actuator's drive coupling with the caliper spindle. The actuator should seat fully by hand without forcing — if it will not seat, the coupling is misaligned; rotate slightly and try again. Do NOT use the mounting bolts to draw the actuator into place, as this will damage the coupling.
   ⚠Forcing the actuator with bolts can shear the internal drive coupling and damage the new part.
8. 8

   Torque the actuator mounting fasteners
   Install the mounting fasteners and tighten evenly in a cross pattern to the verified torque specification. Do not overtighten — the actuator housing is typically a casting and is easily cracked.
   Torque spec

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

   Reconnect the actuator electrical connector
   Route the harness exactly as noted during removal, away from heat shields, suspension travel paths, and the brake rotor. Click the connector fully home and verify the locking tab engages. Secure any harness retainers that were released.

Reassembly

1. Reinstall the rear wheels and hand-thread all lug nuts before lowering.
2. Lower the vehicle and torque the wheel lug nuts in a star pattern to the verified specification (see Wheel Lug Nuts torque).
3. Reconnect the 12V (or 16V/48V) low-voltage battery.
4. Power up the vehicle in a safe, ventilated area with the brake pedal pressed.
5. Using Tesla diagnostic software, exit EPB Service Mode and run the parking brake calibration / initialization routine. Follow the on-screen prompts exactly.
6. Clear any related DTCs and verify no active EPB faults remain.

Verification

• With the vehicle stationary on level ground, cycle the parking brake on and off several times via the in-car control. Confirm audible actuation and no fault messages on the touchscreen.
• Confirm the EPB indicator illuminates and extinguishes correctly with each cycle.
• Perform a low-speed roll test in a safe area: with the vehicle creeping, command the parking brake on and verify the vehicle decelerates and holds. (This validates Auto-Hold / dynamic apply functionality where applicable.)
• Park on a moderate incline, apply the EPB, place the transmission in N (manual transmission units) or P, and confirm the vehicle holds without rolling.
• Re-scan with Tesla diagnostic software after the test drive to confirm no new EPB-related DTCs have set.
• Service interval reminder: brake fluid should be replaced every 2 years per Tesla's published recommendation — if fluid age is unknown, schedule a brake fluid service. Tire rotation is recommended every 6,250 mi on Tesla vehicles; since the rear wheels were off, this is a convenient time to rotate.

More procedures for this vehicle