Put the Electronic Parking Brake into Service Mode

Last updated: June 11, 2026

The BMW 5 Series (F10, 2010–2017) uses an electromechanical parking brake (BMW calls it EMF) with two small electric motors bolted to the rear calipers. Because those motors hold the rear pistons, a rear pad change on the F10 cannot start with a wind-back tool the way an older cable handbrake car would — you first have to put the EPB into service (maintenance) mode so it retracts the pistons electronically, or remove the actuators and wind them back by hand. There is no accelerator-and-switch owner shortcut on this BMW; it is a tool-led job.

What service mode is and why the F10 needs it

Each rear caliper has a geared motor that drives the parking-brake piston. With the car live, that motor clamps and resists being pushed back. Service mode commands both rear motors to wind fully open and locks the EMF out so it cannot re-apply while your hands are at the caliper. Only then can the pistons be compressed and the new pads fitted. The cluster keeps the brake warning lit while the mode is active.

Retracting the rear calipers on the F10

Park on level ground, chock a front wheel, and have the battery on a charger — the motors draw current and a weak battery can abort the routine mid-cycle. Then use one of two routes:

1. Scan-tool route (recommended). Plug a BMW-capable tool into the OBD port: BMW ISTA / Rheingold is the factory option, and consumer tools such as BimmerLink, Foxwell or a Schwaben/Autel EPB unit also carry the function. Open the parking-brake / EMF service function and run “install position” or “workshop / service mode.” You should hear the rear motors whir as the pistons retract.
2. Manual route (no tool). Make sure the EPB is released, then unbolt the actuator motor (two Torx screws) from the back of each rear caliper, insert a Torx bit into the exposed spindle and turn it clockwise until it stops — that screws the piston back in. Refit the motors before driving.

With the pistons home, compress them fully, fit the new pads and refit the caliper.

Never force the pistons back by hand

Never push or lever the F10’s rear EPB pistons back with a G-clamp or piston tool while the actuator is still attached. These are electromechanical, not free-floating — forcing one backwards through the motor shears the internal gearset and writes off the caliper. Retract the piston electronically (service mode) or, if working manually, only ever by turning the spindle clockwise with the actuator removed. If a piston feels solid, the car is not in service mode — stop and re-run the routine rather than forcing it.

Exit, CBS reset and bed-in

When the pads are in and the wheels are back on, use the tool to end service mode (or simply pump the brake pedal firmly several times, then apply the EPB switch once) so the motors re-clamp to the correct air gap. Pump the pedal until it is firm before you move the car. While the tool is connected, reset the rear-brake CBS (Condition Based Service) counter in ISTA/BimmerLink so the dash stops counting against the old pads. Then bed the new pads in: several firm slow-downs from about 30 mph with cooling time between them, and confirm the parking brake holds on a slope.

Frequently Asked Questions

Can I change F10 rear pads without any tool? Yes, by the manual route — release the EPB, unbolt each rear actuator and wind the spindle in clockwise with a Torx bit. But you still need a tool (ISTA or BimmerLink) to reset the rear-brake CBS counter cleanly, otherwise the service reminder lingers.

Does the F10 piston screw in or push straight? The rear EPB pistons wind in clockwise; they do not push straight like the fronts. If you removed the actuator, turn the spindle clockwise to retract.

Why did service mode abort halfway? Almost always low battery voltage. The EMF motors are current-hungry — put the car on a charger and retry.

I get a brake malfunction warning after the job — is that normal? A warning can appear if the mode wasn’t exited or the pedal wasn’t pumped before driving. Re-clamp the EPB with the switch, pump the pedal firm, and clear any stored code; if it persists, scan for the cause.

If the dash throws a brake or EMF fault code while you work, decode it first on our sister site autodtcs.com.