2025-09-26

Redundant Control Unit - Brake (Remove and Replace)

Correction code 33100101402 33100101401 1.44 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 ServiceManualFeedback@tesla.com. NOTE: See Personal Protection to make sure wearing proper PPE when performing the below procedure.NOTE: See Ergonomic Precautionsfor safe and healthy working practices.

2025-09-26: Updated brake bleed steps, suggested adding absorbent mat under the RCU, instructed to remove HVIL harness at LH shock tower.

Warning

This procedure is a DRAFT. Although it has been validated, Warnings and Cautions might be missing. Follow safety requirements and use extreme caution when working on or near High Voltage systems and components.

Note

This procedure is applicable to vehicles manufactured in North America.

Raise and support vehicle

Note
Ensure vehicle is not charging, Remove charging cable if it's plugged in
Open LH front door
Lower LH front window
Open hood
Remove rear apron

Note
16x trim clips, 3x datums, 2x clips
Remove HEPA filter assembly

Note
2x bolts, 10mm, 10 Nm, Pivot rear edge up past brake reservoir then lift up to clear frunk assembly
Remove frunk access panel

Note
3x clips, 3x tabs, 1x connector
Remove bolts securing frunk to vehicle

Note
4x bolts, 10mm, 5 Nm
Remove frunk from vehicle

Note
4x clips, 3x tabs, 2x trim clips, Replace any clips if broken or missing
Power off vehicle from center display

Note
Via Controls > Safety > Power off, Select "Power Off" button at warning dialogue box
Disconnect LV battery and first responder loop

Note
2x connectors, Release green locking tab, Press black tab then pull black connector lock outwards to release connection, Release red lock tab on FRL, Allow 2 minutes for all electrical circuits to fully discharge
Place absorbent material underneath brake lines and brake fluid reservoir to catch any fluid lost
Clean area around brake fluid reservoir and remove brake reservoir cap
Remove brake fluid from brake reservoir

Note
Install absorbent cloth or rag underneath brake fluid reservoir
Raise vehicle fully and lower lift onto locks

Note
Set vehicle to comfortable working height, Make sure there's an audible click of locks on both sides before lowering, Otherwise vehicle may tilt to side
Remove front aero shield

Note
2x nuts, 15mm, 8 Nm
Remove RCU lower fastener

Note
1x bolt, 10mm, 10 Nm
Lower vehicle until tires are touching ground

Note
Raise lift off locks, Then hold lock release lever to keep locks free while vehicle is lowered
Disconnect the HVIL connector from the LH shock tower, and then release the shock tower fir tree clip for that harness branch.
Tuck the HVIL harness branch between the A/C compressor pipes, as pictured.
Remove bolts securing shock tower brace to shock tower

Note
4x bolts, 15mm, 55 Nm, 2x bolts, 62 Nm, See image for torque location
Support the LH side of the shock tower brace

Note
1x airbag, Use assistance if needed
Place an absorbent mat under the RCU to catch any brake fluid spills when the brake lines are released in the following steps.
Release brake fluid reservoir return line

Note
1x locking clip, depress the two sides and pull upwards, there will be minimal excess brake fluid that will be released
Release master cylinder secondary pipe from RCU

Note
1x nut, 12mm, 16 Nm
Remove master cylinder primary pine from RCU

Note
1x nut, 12mm, 16 Nm
Remove brake lines to front calipers

Note
2x nuts, 12mm, 16 Nm
Disconnect RCU ecu

Note
1x locking tab, 1x lever, lift locking tab up and lever down
Remove upper fastener from RCU

Note
1x bolt, 10mm, 10 Nm
Remove RCU

Note
2x guide datums
Install RCU

Note
2x guide datums, hand start the upper 10mm to hold in position
Secure upper fastener to RCU

Note
1x bolt, 10 mm, 10 Nm
Connect RCU ecu

Note
Fully mount connector and lift lever up to secure, 1x locking tab
Install master cylinder pipe to RCU

Note
1x nut, 12mm, 16 Nm
Install secondary cylinder pipe to RCU

Note
1x nut, 12mm, 16 Nm
Install front caliper brake lines to RCU

Note
2x nuts, 12mm, 16 Nm, Hand start first to prevent cross threading
Install brake fluid reservoir return line

Note
1x locking tab, perform a push pull test to ensure it is fully engaged
Loosely Install bolts securing shock tower brace to shock tower

Note
4x bolts, 15mm, 55 Nm, 2x bolts, 62 Nm, See image for torque location
Torque bolts securing shock tower brace to shock tower

Note
4x bolts, 15mm, 55 Nm, 2x bolts, 62 Nm, See image for torque location
Connect first responder loop and LV battery

Note
2x connectors, Secure FRL first, Seat LV battery connection and push black connector lock inwards to secure, Engage green locking tab when fully seated
Run ODIN routine PROC_ICE_X_ENTER-SERVICE-MODEvia Toolbox: (link)
Run ODIN routine
UPDATE_CAN-REDEPLOY
via 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
Thermal ➜ HVAC ➜ CAN Redeploy
chassis ➜ DPB Post Replacement ➜ CAN Redeploy
chassis ➜ ESP Post Replacement ➜ CAN Redeploy
chassis ➜ IDB Post Replacement ➜ CAN Redeploy
chassis ➜ RCU Post Replacement ➜ CAN Redeploy
chassis ➜ ESP Replacement Panel ➜ CAN Redeploy
chassis ➜ IBST Replacement Panel ➜ CAN Redeploy
Once firmware redeploy is complete, Verify on center display release notes are present

Note
If the redeploy fails you may receive an error message on UI
Raise and support vehicle

Note
Ensure vehicle is not charging, Remove charging cable if it's plugged in
Remove LH front wheel cap

Note
1x cap, Use tool to gently pull the center wheel cap to release the clips, Wheels may be equipped with different caps
Loosen LH front wheel nuts

Note
5x nuts, 21mm, 175 Nm
Remove RH front wheel cap

Note
1x cap, Use tool to gently pull the center wheel cap to release the clips, Wheels may be equipped with different caps
Loosen RH front wheel nuts

Note
5x nuts, 21mm, 175 Nm
Remove LH rear wheel cap

Note
1x cap, Use tool to gently pull center wheel cap to release clips, Wheels may be equipped with different caps
Loosen LH rear wheel nuts

Note
5x nuts, 21mm, 175 Nm
Remove RH rear wheel cap

Note
1x cap, Use tool to gently pull center wheel cap to release clips, Wheels may be equipped with different caps
Loosen RH rear wheel nuts

Note
5x nuts, 21mm, 175 Nm
Raise vehicle partially and lower lift onto locks

Note
Set vehicle to a comfortable working height, Make sure there's an audible click of the locks on both sides before lowering, otherwise vehicle may tilt to the side
Remove LH front wheel

Note
5x nuts, 21mm, 175 Nm
Remove RH front wheel

Note
5x nuts, 21mm, 175 Nm
Remove LH rear wheel

Note
5x nuts, 21mm, 175 Nm
Remove RH rear wheel

Note
5x nuts, 21mm, 175 Nm
Lower vehicle partially and set onto locks

Note
Raise lift off locks, Then hold lock release lever to keep locks free while vehicle is lowered, Set vehicle to comfortable working height
Run ODIN routine PROC_ICE_X_ENTER-SERVICE-MODE-PLUSvia Toolbox: (link)
Run RCU Calibrate Pedal Travel Sensor

Note
Select Chassis > Procedures > RCU Post Replacement > Pedal Travel Sensor, click Run, follow on screen instructions to press/release brake pedal, close once routine is succeeded,
Run RCU Calibrate Pressure Sensor

Note
Select Chassis > Procedures > RCU Post Replacement > RCU Calibrate Pressure Sensor, click Run,
Fill brake bleeder reservoir to full level
Top off brake fluid reservoir

Note
Top off brake fluid as needed
Install pressure bleeder adapter onto reservoir
Setup brake bleeder

Note
Connect power supply to bleeder and turn on the power to set pressure to 30 psi, Attach the brake reservoir hose to the brake adapter at this time
Remove LH front caliper inner bleed valve cover then install fluid catcher

Note
1x cover
PLACEHOLDER, Run Manual Caliper Bleed

Note
Select Chassis > Procedures > RCU Post Replacement >Manual Caliper Bleed
Run ODIN routine
When the routine finishes, torque the LH front caliper bleed valve, and then remove fluid catcher.

Note
1x bleed valve, 11mm, 18.5 Nm, 1x cover, Install cover when torqued
Remove RH front caliper inner bleed valve cover then install fluid catcher

Note
1x cover
Run ODIN routine
When the routine finishes, torque the RH front caliper bleed valve, and then remove fluid catcher.

Note
1x bleed valve, 11mm, 18.5 Nm, 1x cover, Install cover when torqued
Turn off and remove pressure brake bleeder kit from vehicle
Check brake fluid level

Note
Top off if necessary
Install service brake reservoir cap
Remove absorbent material from underneath brake booster assembly and reservoir area
Bleed Internal Circuits

Note
Select Chassis > Procedures > RCU Post Replacement > Bleed Internal Circuit-s
Perform RCU Corner Stiffness Test

Note
Select Chassis > Procedures > RCU Post Replacement > Corner Stiffness Test, click Run, follow on screen instructions
Perform RCU Valve Test

Note
Select Chassis > Procedures > RCU Post Replacement > Valve Test, click Run, follow on screen instructions
Disconnect Toolbox 3 from vehicle and remove laptop and Diagnostics Adapter Ethernet Harness

Note
If RJ45 ethernet diagnostic connector present media converter box not required disconnect directly from laptop using an RJ45 Ethernet cable or from OBDII connection
Run ODIN routine PROC_ICE_X_EXIT-SERVICE-MODEvia Toolbox: (link)
Pump brake pedal a few times to ensure brake pedal feels normal
Raise vehicle partially and lower lift onto locks

Note
Set vehicle to a comfortable working height, Make sure there's an audible click of the locks on both sides before lowering, otherwise vehicle may tilt to the side
Install LH front wheel

Note
5x nuts, 21mm, 175 Nm, Start lug nuts by hand before using power tool
Install LH rear wheel

Note
5x nuts, 21mm, 175 Nm, Start lug nuts by hand before using power tool
Install RH front wheel

Note
5x nuts, 21mm, 175 Nm, Start lug nuts by hand before using power tool
Install RH rear wheel

Note
5x nuts, 21mm, 175 Nm, Start lug nuts by hand before using power tool
Lower vehicle until tires are touching ground

Note
Raise lift off locks, then hold lock release lever to keep locks free while vehicle is lowered
Torque LH front wheel nuts

Note
5x nuts, 21mm, 175 Nm
Install LH front wheel cap

Note
1x cap, Align valve stem with wheel cap cavity, Wheels may be equipped with different caps
Torque RH front wheel nuts

Note
5x nuts, 21mm, 175 Nm
Install RH front wheel cap

Note
1x cap, Align valve stem with wheel cap cavity, Wheels may be equipped with different caps
Torque LH rear wheel nuts

Note
5x nuts, 21mm, 175 Nm
Install LH rear wheel cap

Note
1x cap, Align valve stem with wheel cap cavity, Wheels may be equipped with different caps
Torque RH rear wheel nuts

Note
5x nuts, 21mm, 175 Nm
Install RH rear wheel cap

Note
1x cap, Align valve stem with wheel cap cavity, Wheels may be equipped with different caps
Raise vehicle fully and lower lift onto locks

Note
Set vehicle to comfortable working height, Make sure there's an audible click of locks on both sides before lowering, Otherwise vehicle may tilt to side
Install RCU lower fastener

Note
1x bolt, 10mm, 10 Nm
Install front aero shield onto vehicle

Note
7x bolts, 10mm, 5 Nm, Apply Loctite 222 onto front aero shield bolts and install fasteners to front aero shield
Lower vehicle fully

Note
Raise lift off locks, Then hold lock release lever to keep locks free while vehicle is lowered
Install frunk to vehicle

Note
4x clips, 3x tabs, 2x trim clips, Replace any clips if broken or missing
Install bolts securing frunk to vehicle

Note
4x bolts, 10mm, 5 Nm
Install frunk access panel

Note
3x clips, 3x tabs, 1x connector
Install HEPA filter assembly

Note
2x bolts, 10mm, 10 Nm, Pivot forward edge down past frunk assembly, Then carefully move rear edge past brake reservoir and into position, Gently press on RH side of filter to seat seal onto duct
Install rear apron

Note
16x trim clips, 3x locator pins, 2x clips, Replace any missing or damaged clips, Ensure pyrotechnic hood actuators are aligned with openings in apron
Close hood
Raise LH front window
Close LH front door
Remove vehicle from lift

Note
Lower rack arms fully and remove from under vehicle
Perform a road test

Note
Ensure proper brake pedal feel and performance Add correction code 00040100 as needed

Redundant Control Unit - Brake (Remove and Replace)

Figure 1

Figure 2

Figure 3