These instructions apply to the Audi A3 Mk4 (8Y) 2020-Present. For other models, please choose your vehicle here.
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The Audi A3 (8Y, 2020–Present) — Sportback, saloon and S3/RS3 — uses the latest version of Audi’s electronic parking brake with motor-driven rear calipers, controlled by a small (P) switch on the centre console. To replace the rear pads you put the EPB into service mode with a scan tool so the actuators retract electronically. There is no owner button trick that opens the rear calipers on the 8Y.
What Service Mode Is and Why You Need It
Each rear caliper has an electric motor that screws a spindle onto the piston to clamp the pads. New, thicker pads won’t fit until that spindle is wound fully back. Service mode commands both rear motors to retract so the piston can be pushed home by hand with the caliper off the disc.
Use VCDS, OBDeleven, or a generic £20–40 OBD EPB/SAS tool with a VAG “brake pad change / lining change” routine. The OBD port is in the driver’s footwell. On this newer gateway, most tools reach the routine under [53 — Parking Brake]; if a tool can’t open it there, the same function is sometimes reached through the ABS (03) module — follow your tool’s on-screen pad-change menu either way.
Retracting the Caliper
- Park level, ignition on, engine off, battery charger connected — the EPB module is very voltage-sensitive on the 8Y.
- Turn Auto Hold off and release the parking brake.
- Run the tool’s Start lining change mode / brake pad replacement routine. Both rear motors back the spindles off.
- Wait about 30 seconds after they stop, remove the caliper, and push the piston straight in by hand — no twisting.
Never Force the Pistons
Never clamp, wind or hand-force the rear pistons back on the A3 8Y. The piston rides on the EPB motor’s spindle; forcing it strips the actuator gears or spindle thread and ruins the caliper. Let service mode retract the spindle electronically first — afterwards the piston needs only light, straight hand pressure.
Exit and Bed-In
With new pads fitted and the caliper torqued, run the tool’s End lining change mode routine. On the 8Y the actuators typically cycle a few times to take up the gap to the new pads. Switch the ignition off and on, apply and release the EPB twice, and confirm the brake-warning light is out on the virtual cockpit. Then bed in with several moderate 30–40 mph stops, cooling between them, before hard use.
Frequently Asked Questions
Does the A3 8Y always have an electronic parking brake?
Yes — the current 8Y uses the EPB across the range, so a scan-tool service mode is always required to change the rear pads.
My tool won’t open the EPB under module 53 — why?
Some newer VAG cars route the pad-change function via the ABS (03) module instead of 53. Use your tool’s dedicated “brake pad replacement” menu, which selects the right path automatically.
Can I use a cheap generic tool?
Yes — a £20–40 OBD EPB/SAS tool with a VAG pad-change routine works. A basic code reader cannot open the calipers.
Is the S3 / RS3 8Y the same?
Yes — the same rear EPB motors and service-mode routine apply despite the larger brakes.
Parking-brake fault afterwards?
Re-run End lining change mode to fully close the calipers, then clear the code. Decode any stored fault on autodtcs.com.
If an EPB warning lingers after the job and stores a code, look it up on autodtcs.com.
Disclaimer: The information on this page is provided for general guidance only. Always follow your official service manual and safety precautions when working on your vehicle. We are not responsible for errors, omissions, or any damage resulting from the use of this information.
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