Replace the electronic parking brake actuator motor on the rear brake caliper assembly, requiring caliper removal and EPB system service mode activation.

Warnings

Tools required

Parts

• Electronic parking brake actuator motor × 1 — Use OEM Toyota part number 47750-06080 or equivalent
• Brake caliper O-ring seal × 1 — Use OEM specification
• Thread locker (medium strength) × 1 — Loctite 243 or equivalent

Fluids

• DOT 3 Brake Fluid — 0.25 qt

Preparation

1. Park vehicle on level surface and place wheel chocks on front wheels
2. Ensure ignition is OFF but do NOT disconnect the battery (EPB system requires power for service mode)
3. Connect diagnostic scan tool with EPB service mode capability to OBD-II port
4. Loosen rear wheel lug nuts 1/4 turn while vehicle is on ground
5. Raise rear of vehicle and support securely on jack stands at manufacturer-specified jacking points
6. Remove rear wheel completely
7. Siphon approximately 2 oz of brake fluid from master cylinder reservoir to prevent overflow during caliper service
8. Verify scan tool communication with EPB system module

Procedure

1. 1

   Activate EPB Service Mode
   Using the diagnostic scan tool, navigate to EPB system functions and select 'Service Mode' or 'Maintenance Mode'. This retracts the caliper piston and disengages the parking brake motor tension. The EPB warning light will illuminate on the dashboard when service mode is active. Confirm piston is fully retracted before proceeding. Do not attempt to remove caliper without completing this step.
   ⚠If service mode cannot be activated, do not proceed. System may have faults requiring diagnosis before service.
2. 2

   Disconnect EPB Motor Connector
   Locate the electronic parking brake motor on the rear face of the brake caliper. It is a circular black actuator with an electrical connector. Press the locking tab and carefully disconnect the electrical connector from the EPB motor. Inspect connector pins for corrosion or damage.
   ⚠Do not pull on wires; press connector locking tab to release.
3. 3

   Remove Caliper Slide Pin Bolts
   Using a 14mm socket or wrench, remove the two caliper slide pin bolts (upper and lower) that secure the caliper to the bracket. These bolts are on the inboard side of the caliper behind the caliper body. Support the caliper while removing the second bolt to prevent it from falling.
   ℹ️Bolts will have silicone grease; wipe clean and inspect threads for damage.
   Torque spec

   Caliper Slide Pin Bolts35 Nm (26 lb-ft)
4. 4

   Remove Caliper Assembly
   Carefully lift the caliper assembly off the brake rotor and bracket. Do not let caliper hang by the brake hose. Use brake caliper hanger or secure wire to suspend caliper from suspension component. Position caliper where EPB motor is accessible and brake hose is not under tension or strain.
   ⚠Never allow caliper to hang by brake hose as this can cause internal hose damage.
5. 5

   Remove EPB Actuator Motor
   Using a 10mm socket, remove the two mounting bolts securing the EPB motor to the caliper body. The motor is mounted on the rear face of the caliper. Once bolts are removed, carefully pull the motor straight out from the caliper. The motor shaft engages with the caliper piston mechanism; some resistance is normal. Do not twist or pry excessively.
   ⚠EPB motor contains internal gearing. Do not disassemble or attempt to force rotation manually.
   Torque spec

   Mounting Bolts27 Nm (20 lb-ft)
6. 6

   Inspect Caliper and O-Ring
   Remove and discard the O-ring seal from the motor mounting surface on the caliper. Inspect the caliper bore where the motor shaft engages for damage, debris, or excessive wear. Check that the internal spindle mechanism moves freely when rotated by hand. Clean mounting surface with brake cleaner and shop rag. Verify new O-ring matches original size and shape.
7. 7

   Install New O-Ring and Position New Motor
   Install the new O-ring into the groove on the caliper motor mounting surface. Lightly lubricate O-ring with clean brake fluid. Align the new EPB motor shaft with the caliper internal spindle mechanism. The motor shaft has a specific engagement profile; ensure proper alignment before pressing motor into position. Push motor flush against caliper mounting surface.
   ⚠Do not use petroleum-based lubricants on O-ring; use only brake fluid or silicone brake grease.
8. 8

   Install EPB Motor Mounting Bolts
   Install the two 10mm mounting bolts through the EPB motor housing into the caliper body. Start both bolts by hand to ensure proper thread engagement. Tighten bolts in a cross pattern to the specified torque of 27 Nm (20 lb-ft). Verify motor is seated flush against caliper and does not rotate.
   Torque spec

   Mounting Bolts27 Nm (20 lb-ft)
9. 9

   Reconnect EPB Motor Electrical Connector
   Reconnect the electrical connector to the new EPB motor. Press firmly until the locking tab clicks into place. Gently tug on connector to verify it is fully secured. Ensure wiring is routed properly and will not contact hot exhaust components or rotating parts.
10. 10

    Reinstall Caliper Assembly
    Remove caliper from hanger and position back over brake rotor and bracket. Align caliper slide pin holes with bracket. Clean slide pin bolts and apply fresh silicone brake grease to the smooth shaft portion (not threads). Insert and hand-thread both slide pin bolts. Torque bolts to 35 Nm (26 lb-ft). Apply medium-strength thread locker to bolt threads as specified.
    ⚠Ensure brake pads are properly seated on both sides of rotor before securing caliper.
    Torque spec

    Caliper Slide Pin Bolts35 Nm (26 lb-ft)
11. 11

    Exit EPB Service Mode and Test Actuator
    Using the diagnostic scan tool, exit EPB service mode by selecting 'End Maintenance Mode' or equivalent function. The scan tool should command the EPB motor to perform a calibration cycle. Listen for motor operation and observe that the caliper piston advances slightly. The EPB warning light on the dashboard should extinguish. If motor does not operate or faults are present, do not proceed.
    ⚠️If EPB system shows faults after installation or motor does not operate, system is not safe. Do not drive vehicle until issue is resolved.
12. 12

    Perform EPB Calibration
    With scan tool, perform EPB automatic calibration procedure (sometimes called 'adjustment' or 'learning'). This sets proper piston position and motor stroke limits. Follow all scan tool prompts. Calibration typically takes 1-2 minutes and involves several apply/release cycles. Ensure area around caliper is clear during calibration.
    ⚠Do not interrupt calibration procedure once started or repeat calibration may be necessary.
13. 13

    Reinstall Wheel and Lower Vehicle
    Reinstall rear wheel onto hub. Hand-thread all lug nuts to ensure proper thread engagement. Torque lug nuts to 140 Nm (103 lb-ft) in a star pattern. Lower vehicle from jack stands to ground. With vehicle weight on ground, re-torque lug nuts in star pattern to final specification.
    Torque spec

    Wheel Lug Nuts140 Nm (103 lb-ft)
14. 14

    Check Brake Fluid Level
    Open hood and check brake fluid level in master cylinder reservoir. Add DOT 3 brake fluid as necessary to bring level to MAX line. Do not overfill. Wipe any spilled fluid immediately with water. Replace reservoir cap securely.

Reassembly

1. Torque all fasteners to specifications in the order presented
2. Apply thread locker to caliper slide pin bolts as specified
3. Apply silicone brake grease to slide pin bolt shafts before installation
4. Ensure all electrical connectors are fully seated and locked
5. Route EPB motor wiring away from heat and rotating components

Verification

• With engine running and vehicle in Park, apply and release electronic parking brake using dashboard switch multiple times. Verify smooth operation with no unusual noises
• Verify EPB warning light illuminates when parking brake is applied and extinguishes when released
• On level ground with engine running, place transmission in Neutral and verify parking brake holds vehicle securely when applied
• Test drive vehicle in safe area at low speed (under 10 mph) and verify normal brake pedal operation and no pulsation or noise from rear brakes
• After test drive, verify no brake fluid leaks around caliper or EPB motor mounting area
• Use scan tool to verify no EPB system fault codes are present after test
• Verify brake pedal feels firm and normal pedal height is maintained

More procedures for this vehicle