This procedure covers the removal and replacement of the ABS pump/modulator assembly on a 2014-2019 Toyota Corolla with 1.8L I4 engine, including brake line removal, bleeding, and system verification.

Warnings

Tools required

Parts

• ABS pump/modulator assembly × 1 — 44510-02270 or equivalent OEM
• Brake fluid × 1 — DOT 3 specification
• Brake line washers/seals × 6 — Use OEM specification

Fluids

• DOT 3 Brake Fluid — 1 qt

Preparation

1. Park vehicle on level surface and engage parking brake
2. Disconnect negative battery terminal and wait 90 seconds for airbag system to discharge
3. Remove engine cover if equipped
4. Locate ABS pump assembly in engine bay on driver's side near brake master cylinder
5. Clean area around ABS pump and brake lines with brake cleaner to prevent contamination
6. Have drain pan ready and protect painted surfaces around work area with shop towels

Procedure

1. 1

   Relieve brake system pressure
   With the battery disconnected, pump the brake pedal 15-20 times firmly to deplete any residual vacuum in the brake booster and relieve hydraulic pressure in the ABS system. This reduces fluid spillage when disconnecting lines.
2. 2

   Disconnect ABS pump electrical connector
   Locate the main electrical connector on the ABS pump assembly. Press the release tab and carefully disconnect the connector. Move wiring harness aside and secure it away from work area to prevent damage.
   ⚠Do not pull on wires directly. Pull only on the connector body to avoid damaging pins.
3. 3

   Label and disconnect brake lines
   Using a permanent marker or tape, label each of the six brake lines connected to the ABS pump (two from master cylinder, four to wheel calipers). Using the appropriate flare nut wrench, carefully loosen each brake line connection. Work slowly to avoid rounding the fittings. Cap or plug all open brake lines immediately to prevent fluid loss and contamination.
   ⚠️Brake fluid will drain from lines when disconnected. Position drain pan to catch fluid.
   ⚠Use only flare nut wrenches on brake line fittings. Standard wrenches will round the soft metal fittings.
4. 4

   Remove ABS pump mounting nuts
   Locate the three mounting nuts securing the ABS pump bracket to the vehicle chassis. These are typically 12mm nuts. Remove all mounting hardware while supporting the ABS pump assembly to prevent it from falling. Note the position of any brackets or spacers for reinstallation.
   ⚠ABS pump assembly weighs approximately 8-10 lbs and contains residual brake fluid. Support it carefully during removal.
5. 5

   Remove ABS pump assembly
   Carefully remove the ABS pump assembly from the vehicle. Keep it upright to minimize fluid spillage. Drain remaining brake fluid into drain pan. Inspect the mounting location for corrosion or damage and clean if necessary.
6. 6

   Prepare new ABS pump
   Remove the new ABS pump from packaging and inspect for shipping damage. Verify part number matches the original. Install new brake line seals/washers on all six ports. Do not remove protective caps until ready to connect brake lines.
   ℹ️Some replacement ABS pumps come pre-filled with brake fluid. Check manufacturer instructions.
7. 7

   Install new ABS pump assembly
   Position the new ABS pump assembly in the mounting location, ensuring all mounting studs align properly. Install spacers and brackets in their original positions. Thread on mounting nuts finger-tight initially.
   Torque spec

   Mounting Bolts26 Nm (19 lb-ft)
8. 8

   Torque mounting hardware
   Using a torque wrench, tighten the ABS pump mounting nuts to 26.0 Nm (19.0 lb-ft) in a cross pattern to ensure even seating of the assembly. Verify the pump is secure and properly aligned.
   Torque spec

   Mounting Bolts26 Nm (19 lb-ft)
9. 9

   Reconnect brake lines
   Remove caps from brake lines and ABS pump ports. Working one line at a time, thread brake line fittings into the ABS pump by hand to ensure proper thread engagement. Use flare nut wrench to snug each fitting, then tighten an additional 1/4 to 1/2 turn. Do not overtighten as this can damage the sealing surfaces. Verify all six lines are connected to their correct ports per your labels.
   ⚠Cross-threading brake line fittings will ruin the ABS pump. Thread fittings by hand first to ensure proper alignment.
10. 10

    Reconnect electrical connector
    Reconnect the main electrical connector to the ABS pump. Ensure it clicks fully into place and the locking tab is engaged. Inspect connection to verify all pins are properly seated.
11. 11

    Fill brake fluid reservoir
    Fill the brake master cylinder reservoir to the MAX line with fresh DOT 3 brake fluid. Keep reservoir topped off throughout the bleeding procedure to prevent air from entering the system.
    ⚠️Never reuse old brake fluid or use fluid from a previously opened container.
12. 12

    Perform manual brake bleeding
    Bleed brake system in this order: right rear, left rear, right front, left front. For each wheel: attach clear tubing to bleeder screw with other end submerged in clean brake fluid in a container. Have assistant pump brake pedal 3-4 times and hold. Open bleeder screw 1/4 turn until fluid flows, then close before pedal reaches floor. Repeat until no air bubbles appear in fluid. Tighten bleeder screw to specification. Check reservoir level frequently.
    ⚠Never allow brake pedal to go fully to floor during bleeding as this can damage master cylinder seals.
    Torque spec

    Bleeder Screw10 Nm (7 lb-ft)
13. 13

    Perform ABS system bleeding with scan tool
    Connect Toyota Techstream or compatible scan tool to OBD-II port. Navigate to ABS bleeding function. Follow scan tool prompts to activate ABS pump solenoids in sequence. This cycles trapped air from ABS modulator. During this process, continue monitoring brake fluid reservoir and repeat manual bleeding at all four wheels to purge air released from ABS unit. Run automated bleeding sequence at least twice.
    ⚠ABS pump makes loud clicking and whirring noises during automated bleeding. This is normal operation.
14. 14

    Clear diagnostic codes and verify operation
    Using scan tool, clear any ABS-related diagnostic trouble codes stored during the repair. Reconnect negative battery terminal. Turn ignition to ON position without starting engine. Verify ABS warning light illuminates briefly then extinguishes. If ABS light remains on, retrieve codes and diagnose before proceeding.

Reassembly

1. Reinstall engine cover if removed
2. Double-check all brake line connections for tightness and verify no leaks
3. Verify brake fluid reservoir is at proper level
4. Ensure all tools and materials are removed from engine bay

Verification

• Start engine and verify ABS warning light extinguishes after approximately 3 seconds
• With vehicle stationary, firmly press brake pedal and verify it feels firm with no excessive travel or soft/spongy feel
• Inspect all brake line connections at ABS pump for leaks while assistant applies brake pressure
• Perform careful test drive in safe area at low speed (under 10 mph) to verify normal brake operation before road use
• Perform ABS self-test by driving above 12 mph and applying brakes to confirm ABS light remains off
• Re-scan for DTCs with scan tool to ensure no new codes are present
• After test drive, recheck brake fluid level and top off if necessary
• Schedule follow-up inspection after 50-100 miles to recheck fluid level and verify no leaks have developed

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