This procedure covers the removal and replacement of the ABS module on a 2025 Rivian EDV 500, including brake system bleeding and diagnostic testing.

Warnings

Tools required

Parts

• ABS control module × 1 — Use OEM Rivian specification
• ABS module mounting gasket or seal (if equipped) × 1 — Use OEM specification
• Brake line sealing washers × 4 — Use OEM copper washers

Fluids

• DOT 4 Brake Fluid — 1 qt

Preparation

1. Park vehicle on level ground and engage parking brake
2. Turn off vehicle and remove key fob from vehicle interior
3. Disable high-voltage system following Rivian's service mode procedures in the vehicle touchscreen under Service > Service Mode
4. Wait minimum 5 minutes after disabling HV system before proceeding
5. Disconnect 12V auxiliary battery negative terminal
6. Remove front underbody protective panels to access ABS module location
7. Place absorbent pads or containers under ABS module area to catch brake fluid
8. Have at least 1 quart of fresh DOT 4 brake fluid available
9. Connect diagnostic scanner and verify communication with vehicle systems
10. Document any existing fault codes before beginning work

Procedure

1. 1

   Depressurize ABS hydraulic system
   With the vehicle in service mode and 12V battery disconnected, press the brake pedal firmly 25-30 times to depressurize the ABS hydraulic accumulator. The pedal should become noticeably harder as pressure is released. This step is critical to prevent brake fluid spray when disconnecting lines.
2. 2

   Access ABS module compartment
   The ABS module is located in the front compartment area, typically driver's side near the firewall. Remove the access panel or protective cover by removing Torx T25 fasteners. On the EDV 500, you may need to remove the driver's side wheel well liner for full access. Mark or photograph wire harness and brake line routing for reinstallation reference.
3. 3

   Disconnect ABS module electrical connectors
   Locate the two main electrical connectors on the ABS module. Press the locking tabs and carefully disconnect each connector. The connectors may be stiff; do not force them. If corrosion is present, spray with electrical contact cleaner. Note the orientation and position of each connector for reassembly.
4. 4

   Disconnect brake lines from ABS module
   Using the appropriate flare nut wrench (typically 10mm or 12mm), carefully loosen each brake line connection at the ABS module. There are typically 4 brake lines. Work slowly to avoid rounding off the fittings. Allow brake fluid to drain into catch container. Cap or plug brake lines immediately after removal to prevent contamination and minimize fluid loss.
5. 5

   Remove ABS module mounting fasteners
   Remove the mounting bolts securing the ABS module to the bracket. These are typically T30 Torx or 12mm bolts. Support the module weight as you remove the final fastener, as the module is heavy (approximately 8-10 lbs). Carefully remove the module from the mounting bracket, being mindful of any remaining fluid that may drain.
6. 6

   Prepare new ABS module for installation
   Inspect the mounting bracket and clean any corrosion or debris. Compare the new ABS module to the old unit to verify correct part. Check that all brake line ports are clean and free of debris. Install new sealing washers on brake line fittings. If the module includes a mounting gasket or seal, install it according to manufacturer specifications.
7. 7

   Install new ABS module
   Position the new ABS module onto the mounting bracket, aligning all mounting holes. Install mounting bolts and tighten in a cross-pattern to ensure even seating. While no torque specification is available in the database, tighten securely but do not overtighten (estimated 15-20 ft-lbs based on fastener size). Ensure the module is firmly seated against the bracket.
8. 8

   Reconnect brake lines
   Remove caps/plugs from brake lines. Carefully thread each brake line into the correct port on the ABS module, starting threads by hand to prevent cross-threading. Tighten with flare nut wrench in a cross-pattern sequence (opposite corners) to ensure even seating. Tighten firmly but do not overtorque (typically 10-12 ft-lbs for brake line fittings). Verify each connection is secure and properly seated.
9. 9

   Reconnect electrical connectors
   Clean electrical connector pins if needed with contact cleaner. Reconnect both electrical connectors to the ABS module, ensuring they click fully into place and locking tabs engage. Gently tug on each connector to verify secure connection. Ensure no wires are pinched or under tension.
10. 10

    Bleed brake system
    Reconnect the 12V auxiliary battery. Fill the brake fluid reservoir with fresh DOT 4 brake fluid to the MAX line. Using the diagnostic scanner, initiate ABS pump cycling mode if available. Bleed all four wheels in the sequence: right rear, left rear, right front, left front. At each wheel, attach bleeder hose and open bleeder valve. Have assistant press brake pedal slowly or use vacuum pump. Close valve before pedal reaches bottom. Repeat until fluid runs clear without air bubbles. Refill reservoir frequently during bleeding. After manual bleeding, use scanner to perform ABS automated bleed procedure.
11. 11

    Program and configure ABS module
    Connect diagnostic scanner and access Rivian's ABS module programming function. Follow on-screen prompts to program the new module with vehicle-specific calibration data. This typically includes VIN programming, vehicle configuration, and ABS calibration parameters. This step MUST be completed or the ABS system will not function correctly. Verify successful programming by checking for absence of fault codes.
12. 12

    Perform ABS system self-test
    Using the diagnostic scanner, perform a complete ABS system self-test and functional check. Verify all wheel speed sensors are reading correctly and all solenoid valves are functioning. Check for any fault codes and address any issues before proceeding. Verify brake fluid level is at MAX line and top off if needed.

Reassembly

1. Reinstall all protective panels and wheel well liners removed during access
2. Reinstall front underbody protective panels with all fasteners
3. Check brake fluid level one final time and top off to MAX line if needed
4. Exit service mode in vehicle touchscreen to re-enable high-voltage system
5. Clear any temporary fault codes related to service mode

Verification

• Start vehicle and verify ABS warning light illuminates during bulb check then extinguishes after 2-3 seconds
• Use diagnostic scanner to verify no ABS fault codes present
• Check all brake line connections for any signs of fluid leakage
• With vehicle stationary, press brake pedal firmly and hold for 30 seconds - pedal should remain firm with no sinking
• Perform a low-speed test drive in a safe area (5-10 mph) and gently test brake function
• Perform ABS function test at 15-20 mph on dry pavement in a safe area by applying firm braking - you should feel ABS pulsation
• Verify proper brake pedal feel and response at various speeds
• After test drive, recheck brake fluid level and all connections for leaks
• Final diagnostic scan to confirm no new fault codes generated
• Road test at normal speeds to verify complete brake and ABS system functionality

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