Parts for your 2015 Holden Commodore-Cluth slave cylinder

2015 Holden Commodore cluth-slave-cylinder

For the 2015 Holden Commodore, a cluth-slave-cylinder is fitted to manual models and not used on automatics. Holden’s VF Commodore Workshop/Service Manual (GM Global Service Information), along with the gearbox makers’ documentation for the Tremec TR-6060 (V8 manuals) and Aisin AY6 (V6 manuals), specify a concentric hydraulic slave cylinder integrated with the release bearing. Automatic Commodores use a torque converter, so a cluth-slave-cylinder isn’t relevant to those variants.

On a manual 2015 Commodore, the cluth-slave-cylinder’s job is to turn pedal pressure—sent via the master cylinder and brake-fluid hydraulics—into the smooth movement that releases the clutch. Being a concentric type, it sits inside the bellhousing around the gearbox input shaft, pushing directly on the clutch diaphragm spring. That design helps pedal feel and packaging, but it also means the part is buried and the gearbox needs to come out to replace it.

Owners and workshops typically treat the cluth-slave-cylinder as a “while you’re in there” item. Any time the clutch is out for a new disc or pressure plate, fitting a new concentric slave and release bearing is smart insurance against doing the job twice. Quality parts, fresh sealing washers/O-rings, and following the factory bleeding procedure are key to a good result. Use the brake fluid grade specified in the owner’s/service manual (commonly DOT 4 in local workshops) and bleed until the pedal is consistent and free of air.

• Common signs it’s on the way out:
  • Spongy or sinking clutch pedal, hard gear engagement, or crunching into first/reverse
  • Brake-fluid loss with no obvious external leak, dampness or weeping at the bellhousing
  • Clutch drag at lights or a noisy release bearing when the pedal’s pressed

Preventative care is simple: keep an eye on fluid level and colour, and bleed the system periodically—many Aussie and Kiwi workshops refresh clutch hydraulics every couple of years, especially if the fluid looks dark. If the slave leaks or the bearing gets noisy, replacement is the fix. Because it’s internal, budget for transmission removal, labour time varies by model, but pairing a new slave with a complete clutch kit generally saves money and hassle. It’s also worth inspecting the master cylinder and the clutch line quick-connector during the job to avoid future headaches.

Popular questions about the 2015 Holden Commodore cluth-slave-cylinder

Does an automatic 2015 Commodore have a cluth-slave-cylinder?
No. Only the manual variants use a cluth-slave-cylinder. Automatics use a torque converter and don’t have a clutch or hydraulic slave.

How can they tell if the master or the slave is failing?
If there’s fluid weeping from the bellhousing area and the pedal goes soft, it points to the slave. If fluid turns up at the pedal area or along the firewall, the master is suspect. A pressure test and visual inspection usually confirm it.

Should the cluth-slave-cylinder be replaced with every clutch?
It’s strongly recommended. Because the slave is internal, replacing it whenever the clutch is out avoids paying for gearbox removal twice if it fails later.