2025-02-20

Hydraulic Control Unit (HCU) - Brake (Remove and Install)

Correction code 3310010101 FRT 1.92 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 wearing proper PPE when performing the below procedure.

Torque Specifications

Table 1. Torque Specifications: Hydraulic Control Unit (HCU) - Brake (Remove and Install)
Description Torque Value Recommended Tools Reuse/Replace Notes
Bolt that attaches the steering column to the steering gear assembly
18 Nm (13.3 lbs-ft)
  • 13 mm deep socket
 Replace 1111523-00-A
Bolt that secures the A/C compressor ground strap
7 Nm (5.2 lbs-ft)
  • Torx T25 socket
 Reuse
Bolts (x2) that attach the compressor and bracket assembly to the shock tower brace
31 Nm (22.9 lbs-ft)
  • 15 mm deep socket
 Reuse

Nuts (x4) that attach the 4-tube bundle brake pipes to the HCU

Nut that attaches the master cylinder secondary pipe to the HCU

Nut that attaches the master cylinder primary pipe to the HCU
18 Nm (13.3 lbs-ft)
  • 12 mm 6-point flare nut wrench
 Reuse
Bolts (x2) that attach the HCU to frame rail
10 Nm (7.4 lbs-ft)
  • 10 mm socket
 Reuse
Grommet nuts (x2) that attach the HCU to the HCU bracket
8 Nm (5.9 lbs-ft)
  • 10 mm deep socket
 Reuse

Remove

  1. Place the vehicle on the 2-post lift.
    Informational PurposesAn informational icon, calling your attention
    TIp
    Ensure the vehicle is not charging.
  2. Open the LH front door and lower the LH front window.
  3. Lock the steering wheel into position.
  4. Remove the underhood storage unit. See Underhood Storage Unit (Remove and Replace).
  5. Remove the LV battery. See 16V LI - ION BATTERY (Remove and Install).
  6. Remove all the four wheels. See Wheel Assembly (Remove and Install).
  7. Remove the front aero shield panel. See Panel - Aero Shield - Front (Remove and Replace).
  8. Lower the vehicle to a comfortable working height and set the lift onto locks.
  9. Remove and discard the bolt that attaches the steering column to the steering gear assembly.
    Informational PurposesAn informational icon, calling your attention
    TIp
    Use of the following tool(s) is recommended:
    • 13 mm deep socket
  10. Slide the steering column upward to disconnect it from the steering gear assembly.
  11. Position a fluid catcher underneath the front of the vehicle.
  12. Position protective fender cover over the fan shroud.
  13. Disconnect the HVIL connector.
    Informational PurposesAn informational icon, calling your attention
    Note
    Pull the red tab to disengage the lock, and then pull it again to release the connector.
  14. Disconnect the A/C compressor logic connector.
  15. Remove the clip that attaches the harness to the HV harness bracket.
  16. Remove the bolt that secures the A/C compressor ground strap.
    Informational PurposesAn informational icon, calling your attention
    TIp
    Use of the following tool(s) is recommended:
    • Torx T25 socket
  17. Remove the tree clip that attaches the radiator inlet hose to the A/C compressor bracket.
  18. Remove the retaining clips (x5) that attach the A/C compressor HV harness to the shock tower support brace.
    Informational PurposesAn informational icon, calling your attention
    Note
    Pull upward on the clips to assist with removal. Do not pull on the HV cable. Discard any damaged clip.
  19. Remove the tree clips (x4) that attach the coolant hose to the A/C compressor bracket.
  20. With assistance, remove the bolts (x2) that attach the compressor and bracket assembly to the shock tower brace, and then move the compressor and bracket assembly aside.
    Informational PurposesAn informational icon, calling your attention
    Note
    Support the A/C compressor while removing the fasteners. Carefully move the compressor and bracket assembly towards the front of the vehicle.
    Informational PurposesAn informational icon, calling your attention
    TIp
    Use of the following tool(s) is recommended:
    • 15 mm deep socket
  21. Disconnect the HCU connector.
    Informational PurposesAn informational icon, calling your attention
    Note
    Release the red locking tab, then press the black release tab and rotate the lever upward to remove.
  22. Release the HCU connector harness clip.
  23. Place absorbent material underneath the brake lines and the brake fluid reservoir to catch any fluid lost.
  24. Remove the nuts (x4) that attach the 4-tube bundle brake pipes to the HCU.
    Informational PurposesAn informational icon, calling your attention
    TIp
    Use of the following tool(s) is recommended:
    • 12 mm 6-point flare nut wrench
  25. Release the 4-tube bundle brake pipes from the spacer.
    Informational PurposesAn informational icon, calling your attention
    Note
    Do not bend the pipes.
  26. Remove the nut that attaches the master cylinder secondary pipe to the HCU.
    Informational PurposesAn informational icon, calling your attention
    TIp
    Use of the following tool(s) is recommended:
    • 12 mm 6-point flare nut wrench
  27. Remove the nut that attaches the master cylinder primary pipe to the HCU.
    Informational PurposesAn informational icon, calling your attention
    TIp
    Use of the following tool(s) is recommended:
    • 12 mm 6-point flare nut wrench
  28. Release the clips (x2) to remove the spacer from the master cylinder brake pipes.
    Informational PurposesAn informational icon, calling your attention
    Note
    Do not bend the pipes.
  29. Release the master cylinder brake pipes from the clips (x2) at the rear of the HCU bracket.
    Informational PurposesAn informational icon, calling your attention
    Note
    Do not bend the pipes.
  30. Remove the bolts (x2) that attach the HCU to frame rail.
    Informational PurposesAn informational icon, calling your attention
    TIp
    Use of the following tool(s) is recommended:
    • 10 mm socket
  31. Release the tabs (x2) to remove the HCU and bracket assembly.
    Informational PurposesAn informational icon, calling your attention
    Note
    Negotiate the HCU around the brake lines. Take care not to damage the bracket tabs.
  32. Loosen the grommet nuts (x2) that attach the HCU to the HCU bracket.
    Informational PurposesAn informational icon, calling your attention
    TIp
    Use of the following tool(s) is recommended:
    • 10 mm socket
  33. Pry the HCU from the HCU bracket.

Install

  1. Install the HCU into the HCU bracket.
  2. Install the grommet nuts (x2) that attach the HCU to the HCU bracket.
    8 Nm (5.9 lbs-ft)
    Informational PurposesAn informational icon, calling your attention
    TIp
    Use of the following tool(s) is recommended:
    • 10 mm deep socket
  3. Secure the tabs (x2) to install the HCU and bracket assembly onto the vehicle.
    Informational PurposesAn informational icon, calling your attention
    Note
    Negotiate the HCU around the brake lines. Align the bracket tabs with the body holes.
  4. Install the bolts (x2) that attach the HCU to frame rail.
    10 Nm (7.4 lbs-ft)
    Informational PurposesAn informational icon, calling your attention
    TIp
    Use of the following tool(s) is recommended:
    • 10 mm socket
  5. Install the master cylinder brake lines to the clips (x2) at the rear of the HCU bracket.
  6. Clip the spacer onto the master cylinder brake pipes.
  7. Hand-tighten the nut that attaches the master cylinder primary pipe to the HCU, and then torque it.
    18 Nm (13.3 lbs-ft)
    Informational PurposesAn informational icon, calling your attention
    TIp
    Use of the following tool(s) is recommended:
    • 12 mm 6-point flare nut wrench
  8. Hand-tighten the nut that attaches the master cylinder secondary pipe to the HCU, and then torque it.
    18 Nm (13.3 lbs-ft)
    Informational PurposesAn informational icon, calling your attention
    TIp
    Use of the following tool(s) is recommended:
    • 12 mm 6-point flare nut wrench
  9. Clip the 4-tube bundle brake pipes onto the spacer.
  10. Install the nuts (x4) that attach the 4-tube bundle brake pipes to the HCU.
    18 Nm (13.3 lbs-ft)
    Informational PurposesAn informational icon, calling your attention
    Note
    Clean the lines with brake cleaner before mating as needed.
    Informational PurposesAn informational icon, calling your attention
    TIp
    Use of the following tool(s) is recommended:
    • 12 mm 6-point flare nut wrench
  11. Secure the HCU harness clip to the HCU bracket.
  12. Connect the HCU connector.
    Informational PurposesAn informational icon, calling your attention
    Note
    Rotate the lever downward, and then secure the red locking tab.
  13. With assistance, install the bolts (x2) that attach the compressor and bracket assembly to the shock tower brace.
    31 Nm (22.9 lbs-ft)
    Informational PurposesAn informational icon, calling your attention
    TIp
    Use of the following tool(s) is recommended:
    • 15 mm deep socket
  14. Install the tree clips (x4) that attach the coolant hose to the A/C compressor bracket.
  15. Install the retaining clips (x5) that attach the A/C compressor HV harness to the shock tower brace.
    Informational PurposesAn informational icon, calling your attention
    Note
    Visually inspect the clips and replace any damaged clip.
  16. Install the tree clip that attaches the radiator inlet hose to they A/C compressor bracket.
  17. Install the bolt that secures the A/C compressor ground strap.
    7 Nm (5.2 lbs-ft)
    Informational PurposesAn informational icon, calling your attention
    TIp
    Use of the following tool(s) is recommended:
    • Torx T25 socket
  18. Install the clip that attaches the harness to the HV harness bracket.
  19. Connect the A/C compressor logic connector.
  20. Connect the HVIL connector.
  21. Install the LV battery. See 16V LI - ION BATTERY (Remove and Install).
  22. Remove the protective fender cover over the fan shroud.
  23. Remove the fluid catcher from underneath the vehicle.
  24. Slide the steering column downward to connect it to the steering gear assembly.
    Informational PurposesAn informational icon, calling your attention
    Note
    Ensure the intermediate shaft is aligned and fully seated.
  25. Install a new bolt that attaches the steering column to the steering gear assembly.
    18 Nm (13.3 lbs-ft)
    Informational PurposesAn informational icon, calling your attention
    TIp
    Use of the following tool(s) is recommended:
    • 13 mm deep socket
  26. Locally connect a laptop with Toolbox 3 to the vehicle. See Toolbox 3 (Connect and Disconnect).
  27. Clean the area around the brake fluid reservoir breather cap and remove the cap.
  28. Add clean brake fluid to the MAX level in the reservoir.
  29. Install the pressure bleeder adapter onto the vehicle brake reservoir.
  30. Connect power supply to the bleeder tool, and then turn the bleeder tool on.
  31. Set the brake bleed reservoir pressure to 30 PSI, and then attach the brake bleed reservoir to the brake bleed adapter.
  32. Bleed the LH front caliper.
    1. Remove the LH front caliper inner bleed valve cover, and then install the fluid catcher.
    2. Open the inner bleed valve and watch the fluid as it flows out of the caliper.
    3. In Toolbox, click on the Actions/Autodiag tab, and then search for "Bleed FL".
    4. Click PROC_ESP_FRONT-L-REAR-R_BRAKE-BLEEDvia Toolbox: (link), click Run and allow the routine to complete.
    5. Close the bleed valve when the pump stops, or when clean fluid without bubbles flows out of the caliper.
    6. Make sure that the reservoir does not go empty, or that the catch bottle does not overfill.
    7. Repeat step 32.b through step 32.f until clean fluid without bubbles flows out of the caliper.
    8. Remove the fluid catcher, and then torque the LH front caliper bleed valve and install the valve cap.
      18.5 Nm (13.6 lbs-ft)
      Informational PurposesAn informational icon, calling your attention
      TIp
      Use of the following tool(s) is recommended:
      • 11 mm socket
  33. Bleed the RH front caliper.
    1. Remove the RH front caliper inner bleed valve cover, and then install the fluid catcher.
    2. Open the inner bleed valve and watch the fluid as it flows out of the caliper.
    3. In Toolbox, click on the Actions/Autodiag tab, and then search for "Bleed RH".
    4. Click PROC_ESP_FRONT-R-REAR-L_BRAKE-BLEEDvia Toolbox: (link), click Run and allow the routine to complete.
    5. Close the bleed valve when the pump stops, or when clean fluid without bubbles flows out of the caliper.
    6. Make sure that the reservoir does not go empty, or that the catch bottle does not overfill.
    7. Repeat step 33.b through step 33.f until clean fluid without bubbles flows out of the caliper.
    8. Remove the fluid catcher, and then torque the RH front caliper bleed valve and install the valve cap.
      18.5 Nm (13.6 lbs-ft)
      Informational PurposesAn informational icon, calling your attention
      TIp
      Use of the following tool(s) is recommended:
      • 11 mm socket
  34. Bleed the RH rear caliper.
    1. Remove the RH rear caliper bleed valve cover, and then install the fluid catcher.
    2. Open the bleed valve and watch the fluid as it flows out of the caliper.
    3. In Toolbox, click on the Actions/Autodiag tab, and then search for "Bleed".
    4. Click PROC_ESP_FRONT-L-REAR-R_BRAKE-BLEEDvia Toolbox: (link), click Run and allow the routine to complete.
    5. Close the bleed valve when the pump stops, or when clean fluid without bubbles flows out of the caliper.
    6. Make sure that the reservoir does not go empty, or that the catch bottle does not overfill.
    7. Repeat step 34.b through step 34.f until clean fluid without bubbles flows out of the caliper.
    8. Remove the fluid catcher, and then torque the RH rear caliper bleed valve and install the valve cap.
      10 Nm (7.4 lbs-ft)
      Informational PurposesAn informational icon, calling your attention
      TIp
      Use of the following tool(s) is recommended:
      • 11 mm socket
  35. Bleed the LH rear caliper.
    1. Remove the LH rear caliper bleed valve cover, and then install the fluid catcher.
    2. Open the bleed valve and watch the fluid as it flows out of the caliper.
    3. In Toolbox, click on the Actions/Autodiag tab, and then search for "Bleed".
    4. Click PROC_ESP_FRONT-R-REAR-L_BRAKE-BLEEDvia Toolbox: (link), click Run and allow the routine to complete.
    5. Close the bleed valve when the pump stops, or when clean fluid without bubbles flows out of the caliper.
    6. Make sure that the reservoir does not go empty, or that the catch bottle does not overfill.
    7. Repeat step 35.b through step 35.f until clean fluid without bubbles flows out of the caliper.
    8. Remove the fluid catcher, and then torque the LH rear caliper bleed valve and install the valve cap.
      10 Nm (7.4 lbs-ft)
      Informational PurposesAn informational icon, calling your attention
      TIp
      Use of the following tool(s) is recommended:
      • 11 mm socket
  36. Turn off and remove the pressure brake bleeder kit from the vehicle.
  37. Check the brake fluid level and top off as necessary.
  38. Install the service brake reservoir cap.
  39. Remove the absorbent material from underneath the brake booster assembly and the reservoir area.
  40. On the touchscreen, tap the Service Mode "wrench" (at the bottom of the touchscreen UI), and then tap Chassis > Procedures > ESP Post Replacement > Corner Stiffness Test, click Run, and allow the routine to complete.
  41. Press the brake pedal several times to verify proper feel and action.
  42. Disconnect the laptop. See Toolbox 3 (Connect and Disconnect).
  43. Exit Service Mode. See Service Mode.
  44. Install the front aero shield panel. See Panel - Aero Shield - Front (Remove and Replace).
  45. Install all the four wheels. See Wheel Assembly (Remove and Install).
  46. Install the underhood storage unit. See Underhood Storage Unit (Remove and Replace).
  47. Install the HEPA filter assembly. See HEPA FILTER (Remove and Replace).
  48. Remove the locking steering wheel tool.
  49. Raise the LH front window and close the LH front door.
  50. Remove the vehicle from the lift.
  51. Perform a road test to make sure there is proper pedal feel and brake performance.
    Informational PurposesAn informational icon, calling your attention
    Note
    Add test drive correction code 00040100 as a separate activity to the Service Visit.