This procedure covers the removal and replacement of the ABS module on a 2024 Rivian EDV 500, including brake fluid bleeding and system recalibration.

Warnings

Tools required

Parts

• ABS Module/HCU Assembly × 1 — Use OEM Rivian part only
• ABS module gasket/seal (if separate) × 1 — Use OEM specification
• Brake line crush washers × 6 — Check service manual for requirement

Fluids

• DOT 4 Brake Fluid — 1 qt

Preparation

1. Park vehicle on level ground and engage parking brake. Chock rear wheels securely.
2. Disconnect 12V auxiliary battery negative terminal and wait 3 minutes for system capacitors to discharge.
3. Following Rivian high-voltage safety procedures, disable the high-voltage system and verify it is de-energized using appropriate test equipment.
4. Remove any service access panels or covers in the front compartment as needed to access the ABS module location.
5. Connect diagnostic scan tool and record all active and stored fault codes related to the ABS system.
6. Check brake fluid level in reservoir and note condition. If fluid is contaminated, plan for complete system flush.
7. Prepare workspace with drain pan positioned under ABS module area to catch brake fluid.
8. Have all brake line plugs or caps ready to immediately seal open lines and prevent fluid loss and contamination.

Procedure

1. 1

   Document electrical connections
   Before disconnecting anything, photograph the ABS module electrical connectors and their routing. Note the orientation and position of each connector. Label connectors if multiple are present. Verify that the high-voltage system is still disabled.
2. 2

   Disconnect ABS module electrical connectors
   Press the release tabs on each electrical connector attached to the ABS module and carefully pull connectors straight out. The EDV 500 typically has two main connectors on the ABS module. Inspect connector pins for corrosion or damage. Secure disconnected connectors away from work area using zip ties to prevent damage.
3. 3

   Mark and disconnect brake lines
   Using a marker or tags, label each brake line connected to the ABS module with its position (e.g., LF, RF, LR, RR for wheel circuits, plus inlet lines from master cylinder). There are typically 6 brake lines connected to the module. Use the appropriate flare nut wrench to loosen each brake line fitting by turning counterclockwise. Be prepared for brake fluid spillage into the drain pan.
4. 4

   Cap all brake lines immediately
   As each brake line is disconnected from the ABS module, immediately cap or plug both the line end and the module port with clean plastic plugs. This prevents brake fluid from draining, air from entering the system, and contamination. Do not allow brake lines to hang unsupported; secure them to prevent bending or damage.
5. 5

   Remove ABS module mounting fasteners
   Locate and remove the mounting bolts securing the ABS module to its bracket. The EDV 500 typically uses three to four 10mm or 13mm mounting bolts. Support the module with one hand while removing the final fastener, as the module is heavy (typically 5-8 lbs when full of fluid).
6. 6

   Remove ABS module from vehicle
   Carefully lift the ABS module away from its mounting location, being careful not to spill residual brake fluid on vehicle components. Keep the module upright as much as possible. Place the old module in a sealed container for proper disposal or core return. Note the orientation of the module for correct installation of the replacement.
7. 7

   Inspect mounting area and prepare new module
   Clean the ABS module mounting bracket and surrounding area. Check for any signs of corrosion, damage, or brake fluid leakage that may have caused the original failure. Inspect the module mounting surface. Remove the new ABS module from packaging and verify part number matches the vehicle specification. Install new gasket or seal if equipped. Remove protective caps from all ports on the new module.
8. 8

   Install new ABS module
   Position the new ABS module onto the mounting bracket in the correct orientation. Hand-thread all mounting bolts to ensure proper alignment before tightening. Tighten mounting bolts in a cross-pattern to specification. Since no torque specification is provided in the database, tighten securely but do not overtighten (typically 15-20 ft-lbs for this application, but verify with Rivian service information).
9. 9

   Reconnect brake lines to module
   Remove plugs from brake line ports on the new ABS module. Install new crush washers on brake line fittings if specified by service procedure. Thread each brake line fitting into its correct port on the module by hand first, ensuring it is not cross-threaded. Using the flare nut wrench, tighten each fitting to proper specification. Rivian typically specifies 11-13 ft-lbs for brake line fittings, but verify with official documentation. Tighten in a star pattern if possible to ensure even seating.
10. 10

    Reconnect electrical connectors
    Connect each electrical connector to the ABS module, ensuring they click firmly into place. Verify connector orientation matches your reference photos. Gently tug on each connector to confirm it is fully seated and locked. Ensure no wiring is pinched or stretched.
11. 11

    Refill brake fluid reservoir
    Remove the brake fluid reservoir cap and fill with fresh DOT 4 brake fluid to the MAX line. Keep the reservoir topped off throughout the bleeding procedure to prevent introducing air into the system.
12. 12

    Perform initial brake system bleeding
    Using your scan tool, access the ABS bleeding function specific to the Rivian EDV platform. Follow the tool's prompts to activate the ABS pump and open internal valves. Beginning with the wheel circuit farthest from the master cylinder (typically right rear), perform conventional brake bleeding at each wheel until fluid runs clear with no air bubbles. Maintain reservoir level throughout. Typical bleeding sequence: RR, LR, RF, LF, but verify with scan tool instructions.
13. 13

    Perform ABS module automated bleeding
    With the scan tool connected, select the ABS automated bleeding procedure. This will cycle the ABS pump and valves through their full range to purge air from the module's internal chambers. Follow all on-screen prompts. You will need to bleed at each wheel again during this process. This may take 15-30 minutes. Monitor brake fluid level constantly and refill as needed.
14. 14

    Code and calibrate new ABS module
    Using the scan tool, perform the ABS module coding/configuration procedure to program the new module with the vehicle's specific parameters. This typically includes VIN programming, wheel speed sensor calibration values, and brake system configuration. Follow all scan tool prompts carefully. The module may need to be configured for the EDV 500 specific wheelbase, weight distribution, and dual-motor AWD parameters.
15. 15

    Reconnect 12V battery and restore high-voltage system
    Reconnect the 12V auxiliary battery negative terminal. Following Rivian procedures, restore the high-voltage system to operational status. Turn the vehicle to ON position (do not start/ready). The ABS warning light should illuminate briefly and then extinguish. If the ABS light remains on, retrieve codes with scan tool before proceeding.

Reassembly

1. Reinstall all protective covers, shields, or access panels removed during preparation.
2. Verify all brake line connections are tight and show no signs of leakage.
3. Double-check that all electrical connectors are fully seated and locked.
4. Verify brake fluid reservoir is filled to proper level with clean DOT 4 fluid.
5. Clean any spilled brake fluid from vehicle surfaces immediately with water.
6. Remove wheel chocks.

Verification

• With vehicle in READY mode, verify the ABS warning light is off and no brake system warnings appear on the instrument cluster.
• Using scan tool, verify no active fault codes are present in the ABS system.
• Perform a stationary brake pedal test: press brake pedal firmly and hold for 30 seconds. Pedal should remain firm with no sinking. Any pedal fade indicates air in the system or a leak.
• Test drive vehicle in a safe area at low speed (under 10 mph). Apply brakes gently and verify normal pedal feel and stopping ability.
• Perform ABS functional test: on dry pavement in a safe area, accelerate to 20 mph and perform a firm brake application to trigger ABS. You should feel pedal pulsation and hear the ABS pump activate. Verify vehicle stops in a controlled manner without pulling to either side.
• After test drive, inspect all brake line connections at the ABS module for any signs of fluid leakage.
• Re-check brake fluid level and top off if needed.
• Clear any diagnostic codes that were set during installation if instructed by scan tool.
• Perform a final scan tool check to verify all ABS system parameters are within normal range.
• CRITICAL: If brake pedal feel is abnormal, ABS warning light remains on, or any unusual behavior is noted, DO NOT drive the vehicle. Repeat bleeding procedure or seek professional service immediately.

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