Remove and replace the ABS module (Hydraulic Control Unit) on a 2014 Ram 2500 with 6.7L Cummins diesel engine, including brake fluid evacuation, module replacement, bleeding, and system programming.

Warnings

Tools required

Parts

• ABS Module (Hydraulic Control Unit) × 1 — Use OEM specification
• Brake line sealing washers × 6 — Copper or aluminum crush washers

Fluids

• Mopar DOT 4 Brake Fluid — 1.5 qt

Preparation

1. Park vehicle on level surface and apply parking brake
2. Place wheel chocks behind rear wheels
3. Turn ignition OFF and remove key
4. Open brake fluid reservoir cap to relieve pressure (replace cap loosely)
5. Raise front of vehicle and support on jack stands at frame rails
6. Remove both front wheels for access during bleeding procedure
7. Have drain pan and clean rags ready under ABS module location
8. Verify scan tool is compatible with 2014 Ram 2500 ABS programming before proceeding

Procedure

1. 1

   Locate and access ABS module
   The ABS module is located on the driver's side frame rail, forward of the front wheel well. It is mounted to a bracket with multiple brake lines connected to the top. Clean the area around the module with brake cleaner to prevent contamination when lines are disconnected. Identify all six brake line connections on top of the module.
2. 2

   Extract brake fluid from reservoir
   Use a turkey baster or fluid extractor to remove as much brake fluid as possible from the master cylinder reservoir. This minimizes fluid loss when disconnecting lines. Dispose of old brake fluid properly. Do NOT reuse extracted fluid.
   ⚠Dispose of brake fluid according to local environmental regulations. Do not pour down drains.
3. 3

   Disconnect electrical connector
   Locate the main electrical connector on the side of the ABS module. Press the red locking tab and pull the connector straight out from the module. Inspect connector pins for corrosion or damage. Do not allow connector to hang unsupported; secure it away from the work area.
4. 4

   Disconnect brake lines from module
   Using the appropriate size flare nut wrench (typically 3/8" or 1/2"), carefully loosen all six brake line fittings at the ABS module. Work slowly to avoid rounding the fittings. Loosen each fitting 1-2 turns, then allow fluid to drain into the pan. Once drained, completely remove each line and immediately cap or plug the open ports to prevent contamination. Note the position of each line for reinstallation. Remove and discard the old sealing washers from each fitting.
   ⚠Use only flare nut wrenches on brake line fittings. Standard open-end wrenches will round the soft brass fittings.
   ⚠Keep brake lines elevated above module to minimize air entry. Cap all open ports immediately.
   Torque spec

   Brake Line Fittings15 Nm (11 lb-ft)
5. 5

   Remove ABS module mounting bolts
   Locate the two mounting bolts securing the ABS module to the bracket (typically 10mm or 13mm). Support the module with one hand while removing the bolts. Carefully lower the module and remove it from the vehicle. Place it on a clean surface. Inspect the mounting bracket for corrosion or damage.
   Torque spec

   ABS Module Bolts10 Nm (7 lb-ft)
6. 6

   Prepare new ABS module for installation
   Remove the new ABS module from packaging. Verify it matches the old unit in appearance and connector type. Install NEW sealing washers on all six brake line ports of the new module. Do NOT reuse old washers. Remove all protective caps or plugs from the new module ports just before connecting brake lines.
   ℹ️New module will likely not have the same part number as the old unit. It will be programmed to match your vehicle during final steps.
7. 7

   Install new ABS module
   Position the new ABS module onto the mounting bracket. Thread both mounting bolts by hand first to ensure proper alignment. Torque the mounting bolts to specification in a crisscross pattern.
   Torque spec

   ABS Module Bolts10 Nm (7 lb-ft)
8. 8

   Reconnect brake lines
   Install each brake line to its original port on the new ABS module, ensuring new sealing washers are in place. Thread each fitting by hand at least 3-4 turns to ensure proper thread engagement and prevent cross-threading. Once all lines are hand-tight, use the flare nut wrench to torque each fitting to specification. Do not over-torque, as this will damage the soft brass fittings.
   ⚠Cross-threading brake line fittings will require line replacement. Thread carefully by hand first.
   Torque spec

   Brake Line Fittings15 Nm (11 lb-ft)
9. 9

   Reconnect electrical connector
   Plug the main electrical connector into the ABS module until it clicks and the locking tab engages. Tug gently to verify it is fully seated and locked.
10. 10

    Fill brake fluid reservoir
    Fill the master cylinder reservoir to the MAX line with fresh DOT 4 brake fluid from a sealed container. Keep the reservoir topped off throughout the bleeding process. Check level frequently.
11. 11

    Perform manual brake bleeding
    Bleed all four wheels in the correct sequence: Right Rear, Left Rear, Right Front, Left Front. At each wheel, attach clear tubing to the bleeder screw and submerge the other end in a container with clean brake fluid. Have an assistant pump the brake pedal 3-4 times and hold pressure. Open the bleeder screw, allow fluid and air to escape, then close the screw before releasing pedal. Repeat until fluid flows clear with no air bubbles. Torque each bleeder screw after bleeding that wheel. Check reservoir level constantly and refill as needed.
    ⚠️Never allow the brake fluid reservoir to run dry during bleeding. This will introduce massive amounts of air into the system.
    Torque spec

    Bleeder Screw18 Nm (14 lb-ft)
12. 12

    Perform ABS module automated bleed procedure
    Connect the scan tool to the vehicle's OBD-II port. Turn ignition to ON position (engine off). Navigate to ABS system functions and select 'Automated Bleed' or 'ABS Bleed Procedure'. Follow all on-screen prompts. The module will cycle internal valves and pumps. During this process, you may need to repeat manual bleeding at each wheel when prompted. This step is CRITICAL to remove air trapped in the ABS module itself.
    ⚠️Automated bleeding is MANDATORY after ABS module replacement. Manual bleeding alone will NOT remove air from the module's internal valves.
13. 13

    Program and configure new ABS module
    Using the scan tool, perform ABS module configuration/programming. This will transfer the vehicle's VIN, tire size, axle ratio, and other critical parameters to the new module. Follow all scan tool prompts exactly. This process may take 10-20 minutes. Do not disconnect the scan tool or turn off ignition during programming. Once complete, cycle the ignition OFF then ON and verify the ABS warning light illuminates briefly then goes out.
    ⚠️Module programming is MANDATORY. An unprogrammed module will not function correctly and may cause brake failure.
14. 14

    Reinstall wheels and perform final checks
    Reinstall both front wheels and torque lug nuts to specification in a star pattern. Lower vehicle to the ground. Check brake fluid reservoir level and top off to MAX line. Pump brake pedal firmly 10-15 times to ensure solid pedal feel. Pedal should be firm and high. If pedal is soft or spongy, repeat bleeding procedures.
    ⚠️DO NOT drive vehicle if brake pedal is soft, spongy, or travels to the floor. This indicates air in the system or bleeding failure.
    Torque spec

    Wheel Lug Nuts183 Nm (135 lb-ft)

Reassembly

1. Verify all brake line fittings are torqued to specification with no leaks
2. Ensure ABS module electrical connector is fully locked
3. Confirm brake fluid reservoir is filled to MAX line
4. Check that all bleeder screws are closed and torqued properly
5. Verify wheel lug nuts are torqued to specification
6. Ensure no tools or parts are left in wheel wells or under vehicle

Verification

• Turn ignition to ON position and verify ABS warning light illuminates briefly then extinguishes (normal operation)
• Start engine and verify brake pedal is firm and high with no excessive travel
• Perform stationary brake test: with engine running, apply firm brake pressure for 30 seconds and verify pedal does not slowly sink
• Scan for ABS diagnostic trouble codes; there should be none stored
• Test drive at low speed (under 15 mph) in a safe area and verify normal brake operation
• Perform ABS test: on dry pavement in a safe area at 25 mph, apply firm brake pressure to activate ABS; verify ABS pulses pedal and vehicle stops straight without pulling
• Check for brake fluid leaks around all six brake line fittings at the module after test drive
• Verify brake fluid level has not dropped; top off if needed
• Recheck all torque specifications after test drive
• Inform customer that brake pedal feel may improve over the first 50-100 miles as system fully settles

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