Parts for your 2017 Subaru Outback-Brake wheel cylinders

2017 Subaru Outback brake wheel cylinders — are they used?

Short answer: no, the 2017 Subaru Outback doesn’t use brake wheel cylinders. That model runs disc brakes front and rear with calipers, not drum brakes with wheel cylinders. Technical references that confirm this include the Subaru factory Service Manual for the BS-series Outback (2015–2019) covering “Front Disc Brake”, “Rear Disc Brake (EPB)”, and “Electric Parking Brake” systems, the Subaru Electronic Parts Catalogue (FAST) which lists front and rear calipers and the EPB actuator but no wheel cylinders, and mainstream AU/NZ aftermarket catalogues (e.g., Bendix, DBA, Repco/NAPA) that supply pads, rotors, calipers, and EPB-related parts for this car, again with no listing for wheel cylinders.

Why that matters: wheel cylinders are a hydraulic component used in drum brakes to push the shoes outwards. Because the 2017 Outback uses disc brakes, it relies on calipers with pistons to clamp pads onto rotors. The parking brake is electronic and acts on the rear calipers, so there’s no hydraulic drum setup at the back either.

• Service brakes: Four-wheel disc, single-piston sliding calipers.
• Parking brake: Electronic Parking Brake (EPB) acting on rear calipers.
• No drum brake hardware and no hydraulic wheel cylinders fitted.

Owners chasing a “wheel cylinder” for this model are usually after rear caliper or EPB service instead. Typical maintenance focuses on quality pads and rotors, freeing and lubricating caliper slide pins, inspecting brake hoses, and flushing brake fluid at the recommended interval (commonly every two years). If servicing the rear brakes, follow correct EPB service procedures (placing the system in service mode before pushing pistons back) to avoid damaging the EPB motors.

If there’s a soft pedal, uneven braking, or a pull, the checks should target caliper operation, pad wear, rotor thickness/runout, fluid condition, and possible hose or master cylinder issues. There are no wheel cylinders on this Outback to rebuild or replace.

• Does a 2017 Subaru Outback have brake wheel cylinders?
  It doesn’t. The car uses disc brakes with hydraulic calipers on all four corners and an electronic parking brake on the rear calipers. Technical literature for the BS-series Outback and parts catalogues show no wheel cylinder listings for this model year.
• How is the parking brake set up on a 2017 Outback?
  It’s an Electronic Parking Brake (EPB) that applies the rear calipers via electric motors. It’s not a drum-in-hat design and has no wheel cylinders or parking brake shoes. When replacing rear pads or rotors, the EPB must be put into service mode to retract the caliper pistons safely.
• What should be serviced instead of wheel cylinders on this model?
  Focus on pads, rotors, caliper slide pins, caliper seals if needed, flexible brake hoses, and a regular brake fluid flush. If there are EPB faults, testing and repair will centre on the rear calipers and EPB actuators rather than any drum brake components.