This procedure replaces the electronic parking brake actuator located on the rear brake caliper assembly, restoring proper parking brake operation.

Warnings

Tools required

Parts

• Parking brake actuator assembly × 1 — 47750-02100 or equivalent OEM
• Brake fluid (for topping off reservoir) × 1 — DOT 3

Fluids

• DOT 3 Brake Fluid — 0.25 qt

Preparation

1. Park vehicle on level, solid ground and apply wheel chocks to front wheels
2. Ensure ignition is OFF and parking brake is released
3. Open hood and disconnect the 12V battery negative terminal. Wait 90 seconds for electrical system discharge
4. Loosen rear wheel lug nuts while vehicle is still on ground (do not remove)
5. Raise rear of vehicle with floor jack and support securely on jack stands at proper frame jacking points
6. Remove rear wheels completely
7. Inspect brake fluid level in master cylinder reservoir (should be at MAX line). Mark initial level
8. Connect OBD-II scan tool capable of parking brake service functions (Toyota Techstream or equivalent)

Procedure

1. 1

   Enter parking brake service mode
   Using the scan tool, navigate to the parking brake system menu. Select 'Service Mode' or 'Maintenance Mode' to electronically retract the parking brake actuator piston. This step is essential - the actuator cannot be safely removed while engaged. Follow all scan tool prompts. The actuator motor will run for 10-15 seconds. Verify on scan tool that service mode is active before proceeding.
   ⚠️Do NOT attempt to remove the actuator without entering service mode. The piston will be fully extended and removal will damage the caliper assembly.
2. 2

   Disconnect actuator electrical connector
   Locate the parking brake actuator on the rear brake caliper (small motor assembly on inboard side). Press the release tab on the electrical connector and disconnect it from the actuator. Tuck the connector away from the work area to prevent damage.
   ⚠Verify battery is disconnected before touching electrical connections to prevent short circuit.
3. 3

   Remove caliper slide pin bolts
   Using a 14mm socket or wrench, remove the upper and lower caliper slide pin bolts from the rear caliper. Keep bolts organized for reinstallation. The caliper will now be loose.
   Torque spec

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

   Remove and support caliper assembly
   Carefully lift the entire caliper assembly (with actuator still attached) off the brake rotor and bracket. Do NOT disconnect the brake hose. Use mechanic's wire or a bungee cord to hang the caliper from the suspension strut or coil spring. Ensure no tension is placed on the brake hose.
   ⚠Never let the caliper hang by the brake line. This will damage the line and cause brake system failure.
5. 5

   Remove parking brake actuator mounting bolts
   With the caliper supported, locate the two actuator mounting bolts on the back of the caliper body (typically 10mm hex). Remove both bolts completely. The actuator assembly will now separate from the caliper. Note the position and orientation of any gaskets or seals.
   ℹ️Some actuators have an O-ring seal between the actuator and caliper body. Inspect this seal and replace if damaged or included with new actuator.
   Torque spec

   Mounting Bolts26 Nm (19 lb-ft)
6. 6

   Remove old actuator and inspect caliper
   Carefully pull the parking brake actuator away from the caliper body. The actuator gear engages with the caliper piston mechanism - it should separate easily in service mode. Inspect the caliper piston surface and gear teeth for damage, corrosion, or wear. Clean the mounting surface on the caliper with brake cleaner and a wire brush if needed.
   ⚠If the actuator does not separate easily, STOP. Verify service mode is still active. Forcing removal will damage internal components.
7. 7

   Prepare new actuator for installation
   Remove the new parking brake actuator from packaging. Verify it matches the old unit exactly. If the new actuator includes a new O-ring or gasket, install it onto the actuator mounting surface. Apply a thin coat of silicone brake grease to the actuator gear teeth and mounting surface (do not over-grease).
   ℹ️Some replacement actuators come pre-loaded in the retracted position for installation. Verify installation instructions with the part.
8. 8

   Install new actuator to caliper
   Align the new actuator with the caliper piston gear mechanism. Carefully engage the actuator gear with the piston, rotating slightly if needed to mesh the teeth. Once fully seated against the caliper body, install the two mounting bolts hand-tight, then torque to specification using a torque wrench.
   ⚠Ensure actuator gear teeth are fully engaged before tightening bolts. Misalignment will cause actuator failure and grinding noises.
   Torque spec

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

   Reinstall caliper assembly
   Remove the support wire/bungee from the caliper. Inspect brake pads for wear (minimum 2mm thickness required). Position the caliper assembly back over the brake rotor and align with the caliper bracket. Apply silicone brake grease to the slide pin bolts and threads. Install both upper and lower slide pin bolts and torque to specification in a star pattern.
   Torque spec

   Caliper Slide Pin Bolts35 Nm (26 lb-ft)
10. 10

    Reconnect actuator electrical connector
    Reconnect the electrical connector to the new parking brake actuator. Ensure the connector clicks firmly into place and the locking tab is fully engaged. Route the wiring to avoid contact with suspension components or the wheel.
11. 11

    Exit service mode and calibrate actuator
    Using the scan tool, exit parking brake service mode. Then initiate the parking brake actuator calibration procedure. This will run the actuator through its full range of motion to set the reference positions. Follow all scan tool prompts. The actuator will cycle several times and may make grinding or buzzing sounds - this is normal during calibration.
    ⚠️Do NOT skip the calibration procedure. Without calibration, the parking brake will not function properly and may fail to hold the vehicle.
12. 12

    Reinstall wheel and lower vehicle
    Reinstall the rear wheel, threading lug nuts by hand first. Torque lug nuts to specification in a star pattern using a torque wrench. Repeat the entire procedure on the opposite rear wheel if replacing both actuators. Lower vehicle from jack stands and perform final lug nut torque with vehicle on ground.
    Torque spec

    Wheel Lug Nuts140 Nm (103 lb-ft)
13. 13

    Reconnect battery and perform system test
    Reconnect the 12V battery negative terminal. Start the vehicle and verify no warning lights on the instrument cluster. Using the scan tool, check for any parking brake system fault codes. Clear any codes that were present before starting. Check brake fluid level in master cylinder and top off with DOT 3 fluid if needed to reach MAX line.

Reassembly

1. Ensure all electrical connections are secure and properly routed away from moving components
2. Verify brake fluid level is at MAX line in master cylinder reservoir
3. Double-check that all caliper bolts are torqued to specification
4. Verify wheel lug nuts are torqued to 140 Nm in star pattern with vehicle on ground

Verification

• With vehicle running, engage and release parking brake using dashboard switch multiple times - verify smooth operation with no unusual sounds
• Verify parking brake warning light on instrument cluster illuminates when engaged and extinguishes when released
• Park on a moderate incline (if safe to do so), engage parking brake, shift to neutral - vehicle should hold firmly without rolling
• Test drive vehicle at low speed and apply service brakes - verify normal brake pedal feel and stopping power
• Using scan tool, verify no parking brake system fault codes are present
• Listen for any unusual grinding, clicking, or motor sounds from rear brakes during parking brake operation
• Verify parking brake holds vehicle on incline for at least 30 seconds without any movement
• After 24 hours of normal driving, re-check brake fluid level and verify no leaks at caliper connections

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