Hydraulic Control Unit (HCU) - Brake (Remove and Replace)
Correction code 33109522 2.46 NOTE: Unless otherwise explicitly stated in the procedure, the above correction code and FRT reflect all of the work required to perform this procedure, including the linked procedures. Do not stack correction codes unless explicitly told to do so. NOTE: See Flat Rate Times to learn more about FRTs and how they are created. To provide feedback on FRT values, email LaborTimeFeedback@tesla.com. NOTE: See Personal Protection to make sure proper PPE is worn when performing the below procedure.
- 2024-10-23: Added steps to run Service CAN Redeploy.
Remove
- Open the LH front door and lower the LH front window.
- Raise and support the vehicle on a 2 post lift. See Raise Vehicle - 2 Post Lift.
- Remove the rear underhood apron. See Underhood Apron - Rear (Remove and Replace).
- Remove the LH and RH underhood aprons. See Underhood Apron - LH (Remove and Replace).
- Remove the RH wiper arm. See Wiper Arm - RH (Remove and Replace).
- Remove the LH wiper arm. See Wiper Arm - LH (Remove and Replace).
- Remove the cowl scree panel. See Panel - Cowl Screen (Remove and Replace).
- Disconnect LV power. See LV Power (Disconnect and Connect).
-
Clean the area around the brake fluid
reservoir, and then remove the brake reservoir cap.
-
Remove the brake fluid from the brake
reservoir.
NoteUse special tool 1541474-00-B - measure & fill kit.
-
Install the brake reservoir cap.
-
Remove the bolts (x2) that attach the
remote brake fluid reservoir to the LH FST cap.Tip: Use of the following tool(s) is recommended:
- 10 mm socket
NoteRotate the reservoir with bracket out of the LH FST cap. - Remove all wheels. See Wheel Assembly (Remove and Install).
- Remove the LH front wheel arch liner. See Wheel Arch Liner - Front - LH (Remove and Replace).
-
Disconnect the LH front repeater
electrical connectors (x2).
-
Release the clip that attaches the LH
repeater electrical harness to the body.
-
Disconnect the ground junction
connector G500.
NoteRelease the red locking tab. Press the black tab and rotate the lever to release it.
-
Remove the bolt that attaches the
junction ground terminal to the body.Tip: Use of the following tool(s) is recommended:
- 10 mm socket
-
Disconnect the hydraulic control unit
electrical connector.
NoteRelease the red locking tab, and then rotate the lever upwards to remove it.
-
Pull the HCU ECU harness and connector
through the body into the wheelwell.
-
Remove the bolts (x3) that attach the
HCU bracket.Tip: Use of the following tool(s) is recommended:
- 10 mm socket
-
Put shop towels underneath the brake
lines to catch any brake fluid that may leak.
-
Disconnect the brake fluid level
sensor electrical connector.
NotePull the red tab to disengage the lock, and then pull again to release the electrical connector. Do not push down on the red tab.
-
Remove the flexible brake lines (x2)
from the master cylinder.Tip: Use of the following tool(s) is recommended:
- 12 mm ratcheting combination wrench flex head
-
Remove the nuts (x4) that attach the
4-tube bundle brake lines to the HCU.Tip: Use of the following tool(s) is recommended:
- 12 mm ratcheting combination wrench flex head
-
Release the brake line retainers (x2)
from the underside of the HCU bundle.
-
Release the brake lines from the LH
side of the HCU bundle.
NoteRetainers (x2).NoteSupport and shift the HCU with one hand while using the side access hole to release the lines.
-
Remove the HCU, bracket, and MCYL to
HCU brake lines from vehicle as an assembly.
NoteRotate and lift assembly up along the brake booster while shifting 4-tube brake lines aside.NoteTake care not to bend the brake lines.
-
Remove the nuts (x2) that attach the
flexible master cylinder brake lines to the HCU.Tip: Use of the following tool(s) is recommended:
- 12 mm ratcheting combination wrench flex head
-
Loosen the nuts (x2) that attach the
HCU to the HCU bracket.Tip: Use of the following tool(s) is recommended:
- 10 mm socket
NoteNuts do not need to be fully removed since the bracket is slotted. -
Release the snapfit pin, and then
remove the HCU from the HCU bracket.
NotePry between the bracket and HCU to release.
Install
-
Install the ECU to the HCU
bracket.
NoteSnapfit pin (x1)NoteAlign the bracket to the rubber bushings, and then press together to secure the snapfit pin.
-
Install the nuts (x2) that attach the
HCU to the HCU bracket.Tip: Use of the following tool(s) is recommended:
- 10 mm socket
-
Remove the protective tape, and then
install the flexible master cylinder brake lines to the HCU.Tip: Use of the following tool(s) is recommended:
- 12 mm ratcheting combination wrench flex head
NoteLeave the protective tape covering the 4 tube outlets to prevent contamination during installation. -
Install the HCU, bracket, and MCYL to
HCU brake lines to the vehicle as an assembly.
NoteRotate and lower the assembly down along the brake booster while shifting the 4-tube brake lines over.NoteTake care not to bend the brake lines.
-
Secure the brake lines to the LH side
of the HCU bundle.
NoteRetainers (x2).NoteSupport and shift the HCU with one hand while using side access hole to secure the brake lines.
-
Secure the brake lines to the
underside of the HCU bundle.
NoteRetainers (x2)
-
Push the HCU ECU harness and connector
through the body into the frunk area.
-
Connect the HCU electrical
connector.
NoteSeat the connector, then rotate the lever downward, and then secure the locking tab.
-
Remove the remaining protective tape,
and then install the 4-tube bundle brake lines to the HCU.Tip: Use of the following tool(s) is recommended:
- 12 mm ratcheting combination wrench flex head
NoteNuts (x4).NoteClean the brake lines with brake cleaner before mating, as needed. -
Install the flexible brake lines (x2)
to the master cylinder.Tip: Use of the following tool(s) is recommended:
- 12 mm ratcheting combination wrench flex head
NoteClean the brake lines with brake cleaner before installation. -
Connect the brake fluid level sensor
electrical connector.
-
Remove the shop towels from underneath
the brake lines.
NoteClean up any residual fluid lost.
-
Install the bolts (x3) that attach the
HCU bracket.Tip: Use of the following tool(s) is recommended:
- 10 mm socket
NoteStart to fasten bolts by hand to prevent cross-threading. -
Install the bolt that attaches the
junction ground terminal to the body.Tip: Use of the following tool(s) is recommended:
- 10 mm socket
-
Connect the ground junction connector
G500.
NoteSecure the red locking tab.
-
Fasten the LH repeater electrical
harness to the body.
-
Connect the LH front repeater
electrical connectors (x2).
NoteSupport the repeater from the exterior to prevent damage to the retaining clips.
- Install the LH front wheel arch liner. See Wheel Arch Liner - Front - LH (Remove and Replace).
-
Install the bolts (x2) that attach the
remote brake fluid reservoir to the LH FST cap.Tip: Use of the following tool(s) is recommended:
- 10 mm socket
NoteRotate the reservoir with bracket onto the LH FST cap. - Install the cowl scree panel. See Panel - Cowl Screen (Remove and Replace).
- Install the RH wiper arm. See Wiper Arm - RH (Remove and Replace).
- Install the LH wiper arm. See Wiper Arm - LH (Remove and Replace).
- Install the LH and RH underhood aprons. See Underhood Apron - LH (Remove and Replace).
- Reconnect LV power. See LV Power (Disconnect and Connect).
- Connect a laptop with Toolbox 3 to the vehicle. See Toolbox 3 (Connect and Disconnect).
- In Toolbox, click the Actions tab, and then search for "Service-Redeploy".
-
Click UPDATE_CAN-REDEPLOYvia Toolbox: (link)via Service Mode Plus:
- Drive Inverter Replacement ➜ Drive Inverter DIRE1L Replacement ➜ CAN Redeploy
- Drive Inverter Replacement ➜ Drive Inverter DIRE1R Replacement ➜ CAN Redeploy
- Drive Inverter Replacement ➜ Drive Inverter DIRE2 Replacement ➜ CAN Redeploy
- Drive Inverter ➜ Front Drive Inverter Replacement ➜ CAN Redeploy
- Drive Inverter ➜ Rear Drive Inverter Replacement ➜ CAN Redeploy
- Drive Inverter ➜ Rear Left Drive Inverter Replacement ➜ CAN Redeploy
- Drive Inverter ➜ Rear Right Drive Inverter Replacement ➜ CAN Redeploy
- Drive Unit ➜ Front Drive Unit Replacement ➜ CAN Redeploy
- Drive Unit ➜ Rear Drive Unit Replacement ➜ CAN Redeploy
- Bleed the brakes. See Brake Fluid Bleed/Flush (Remove and Replace).
- Install all wheels. See Wheel Assembly (Remove and Install).
- Install the rear underhood apron. See Underhood Apron - Rear (Remove and Replace).
- Close the hood.
-
Remove the vehicle from the
lift.
NoteLower the rack arms fully and remove them from under the vehicle.NoteRemove the air suspension from "Jack Mode."
-
Calibrate the rear doors.
NoteIf the "Calibration Needed" message appears on the vehicle touchscreen, touch and hold Calibrate to calibrate the rear doors
-
Perform a road test and ensure proper
brake pedal feel and performance.
NoteAdd correction code (00040100) to account for time.