Parts for your 2020 Holden Commodore-Brake shoes

2020 Holden Commodore brake shoes — what’s actually fitted

For the 2020 Holden Commodore (ZB series), brake shoes aren’t used. This model runs four-wheel disc brakes, and the parking brake is an Electric Parking Brake (EPB) that clamps the rear brake calipers — there’s no drum or drum-in-hat arrangement with shoes. Technical sources that cover this setup include: the Holden ZB Commodore Owner’s Manual (MY20) describing the EPB as operating the rear brake calipers, the Opel Insignia B/GM service information specifying rear disc brakes with an integrated EPB motor on the caliper, and major parts catalogues (GM/ACDelco EPC and Bendix Australia) listing pads, rotors and EPB actuators for the rear, with no parking brake shoes offered for ZB.

Why no brake shoes? Brake shoes live inside a drum and expand outward to create friction. The ZB Commodore instead uses ventilated disc rotors with pads, while the parking brake function is handled electronically by motors on the rear calipers. This design trims weight, simplifies packaging, improves heat management on the rear brakes, and integrates neatly with stability and hill-hold systems. With an EPB-on-caliper design, there’s simply nowhere for drum-style shoes to fit, so a shoes-based “handbrake” isn’t part of this platform.

What should owners focus on instead of shoes? Regular servicing revolves around the rear brake pads, rotors and the EPB mechanism:

• Pad and rotor wear: Inspect thickness and surface condition, replace pads/rotors as required and bed them in properly.
• EPB service mode: When doing rear pads, place the EPB into service/maintenance mode with the proper scan tool or procedure to retract the motors — forcing pistons back without this can damage the EPB.
• Electrical health: Keep EPB connectors clean and dry, check for stored EPB faults after brake work and run calibrations where specified by the service manual.
• Feel and function: After any brake service, confirm smooth EPB apply/release and that the vehicle holds on a slope.

Technical references consulted: Holden ZB Commodore Owner’s Manual (MY20) — Electric Parking Brake section, Opel Insignia B (ZB Commodore) Workshop/Service Manual — Rear brakes with integrated EPB caliper, GM/ACDelco Electronic Parts Catalogue and Bendix Australia part finder — listings for ZB Commodore rear pads/rotors/EPB actuators and no parking brake shoes.

Popular questions about 2020 Holden Commodore brake shoes

Does a 2020 Holden Commodore have brake shoes?
No. The ZB Commodore uses rear disc brakes and an Electric Parking Brake that squeezes the rear calipers. There are no drum-in-hat parking brake shoes on this model.

How is the parking brake set up on the 2020 Commodore?
It’s an EPB integrated into the rear calipers. Small electric motors wind the caliper pistons out to hold the car. That’s why you won’t find separate drum shoes in the rear hubs.

What do I service instead of brake shoes?
Focus on rear brake pads and rotors, and use the correct EPB service/maintenance mode when changing pads. After fitting, calibrate the EPB if specified and check for smooth apply and release.