Parts for your 2020 Subaru Impreza-Brake wheel cylinders

2020 Subaru Impreza brake wheel cylinders — are they even a thing?

Short answer: no, a 2020 Subaru Impreza doesn’t use brake wheel cylinders. Wheel cylinders are hydraulic actuators found in drum brake assemblies. The 2020 Impreza runs disc brakes front and rear, so there are no hydraulic wheel cylinders anywhere in the service brake system. This is confirmed in the Subaru factory Service Manual (Brake section, GK/GT Impreza, MY17–MY21) and owner’s literature, as well as Subaru Australia MY20 specification sheets, which list ventilated front discs and solid rear discs.

What can create confusion is the rear “drum-in-hat” parking brake built into the rear rotors. That setup uses small brake shoes inside the rotor hat for the handbrake, but it’s mechanically actuated by a cable, not hydraulically driven, so there’s still no wheel cylinder involved. The hydraulic stopping force at all four corners comes from caliper pistons in disc brake calipers.

Why Subaru goes this way is pretty straightforward: four-wheel discs deliver better heat management and pedal feel, play nicely with ABS and stability systems, and simplify parts commonality across the range. On the servicing front, anyone hunting for “wheel cylinders” for a 2020 Impreza is looking at the wrong part. What actually needs attention over time are:

• Front and rear brake calipers (slides/pins cleaned and lubricated, piston seals inspected)
• Brake pads and rotors (wear, thickness, run-out)
• Brake fluid (replace per Subaru’s maintenance schedule)
• Parking brake shoes inside the rear rotor hat (inspect/adjust, replace if lining is worn)

If a parts catalogue shows a wheel cylinder for this model, it’s likely a generic listing, a miscategorised item, or intended for older Subaru models that did use rear drums. For accuracy, match parts to the VIN and the disc-brake configuration noted in Subaru’s official documentation.

Technical references: Subaru Service Manual — Brake section (GK/GT Impreza, 2017–2021 platform), Subaru Owner’s Manual — Brake system, Subaru Australia MY20 Impreza specification sheets (listing disc brakes front and rear and drum-in-hat mechanical parking brake).

FAQs

Does a 2020 Subaru Impreza have brake wheel cylinders?
No. The 2020 Impreza has disc brakes at the front and rear, so it uses calipers with pistons rather than drum brake wheel cylinders. The only “drum” element is the mechanical parking brake inside the rear rotor hat, which doesn’t use hydraulic wheel cylinders.

What should be serviced instead of wheel cylinders on a 2020 Impreza?
Focus on the disc brake hardware: pads, rotors, caliper slide pins and seals, and brake fluid changes per the Subaru maintenance schedule. Also inspect and adjust the rear drum-in-hat parking brake shoes and cables as needed.

Why do some parts listings show wheel cylinders for my 2020 Impreza?
That’s usually a catalogue error or a catch-all listing. Earlier or different models with rear drum brakes use wheel cylinders, but the 2020 Impreza doesn’t. Always verify parts by VIN and by the four-wheel disc brake setup documented by Subaru.