Put the Electronic Parking Brake into Service Mode

Last updated: June 12, 2026

On the Subaru Forester (Mk5/SK, 2019–Present), the rear calipers use a motor-on-caliper (MoC) electronic parking brake (EPB). Each rear caliper has its own actuator motor bolted to the back that drives the piston for parking duty. Before you can change rear pads, those motors have to be wound fully back electronically — and on this generation that means a scan tool. This guide explains how to put the EPB into service mode honestly, including the one warning that saves the most calipers.

What service mode does and why you need it

With the parking brake set, the rear pistons are held out by the actuator spindle. If you try to compress a piston while the spindle is extended, you fight the gear train and can strip the motor or bend the spindle. Service (maintenance) mode commands both rear actuators to retract the spindle fully and locks the EPB out so it cannot re-apply while your hands are in the caliper. On the SK Forester there is no factory-documented owner button sequence that does this — the Subaru service manual lists the bidirectional scan-tool function as the method. Be honest with yourself before starting: you need either a capable tool or a willingness to remove the actuator motor.

Enter service mode (scan tool)

1. Park on level ground, chock the front wheels, and switch the ignition ON with the engine OFF (foot off the brake).
2. Plug a Subaru-capable bidirectional scan tool (SSM, or an aftermarket tool with Subaru EPB support such as Foxwell NT-series, Autel, or Launch) into the OBD-II port under the dash.
3. Navigate to the parking-brake / VDC module, find Brake Maintenance Mode (sometimes labelled Pad Replacement Mode), and select Enter.
4. The rear actuators whir as the spindles retract. The EPB warning light staying on is normal — it confirms the brake is disabled.

If you have no scan tool

1. Remove the two Allen/hex cap screws holding the actuator motor to the rear of each caliper.
2. Lift the motor off and turn the exposed splined spindle by hand (or with the matching bit) to wind the piston back. Fit a fresh O-ring before reinstalling the motor.

Never force the pistons back by hand

Do not press the rear pistons in with a C-clamp, and never push the brake pedal with a caliper open. The SK rear piston retracts only by unwinding the EPB spindle — electronically via the tool, or mechanically with the motor removed. Forcing it ruins the actuator and is the single most common Forester brake-job mistake.

Exit service mode and bed in

Fit the new pads, slide the caliper home, and torque the guide bolts to spec. Then reverse the procedure: with the tool, select Exit Maintenance Mode and let the actuators extend and run their self-test; or refit the motors with new O-rings and cycle the EPB switch a few times until it applies and releases cleanly. Pump the brake pedal until firm before driving. Bed the pads in with several moderate stops from about 30–40 mph, then let the brakes cool. Confirm the EPB holds on an incline.

Frequently Asked Questions

Can I do an SK Forester rear brake job without any tool? Yes, but only by removing each rear actuator motor and winding the spindle by hand. There is no reliable button-only service mode on this generation.

Will holding the EPB switch put it in service mode? No — holding the switch applies the brake; it does not retract the actuators for a pad change. That advice circulates online but is not the SK method.

Why is the parking-brake light on the whole time? Because service mode disables the EPB. The light goes out once you exit the mode and the system re-initialises.

My tool left it stuck in maintenance mode — now what? Re-enter the menu and explicitly select Exit, then clear codes. A C1984/EPB code usually clears once the actuators complete a full apply-release cycle.

Do I need to replace anything when removing the actuator motor? Yes — fit a new actuator O-ring each time the motor comes off, or you risk moisture ingress.

If a parking-brake or VDC warning light stays on afterwards, decode the stored fault first at autodtcs.com so you know whether it is a simple re-initialisation or a real actuator fault.