Ford Focus Mk3 Slave Clutch Cylinder: Specs, Fitment & Common Faults

The other half of the hydraulic clutch system, and the faults that get mistaken for a failing master cylinder.

Generation covered: this guide is for the third-generation Focus, built 2011–2018 (commonly the 2014–2018 registered examples still in daily use). The newer Mk4 Focus (2018–) uses different part numbers throughout — check your V5C logbook or VIN if you're unsure which generation you have.

Illustration of a hydraulic cylinder component

Illustration for editorial purposes

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Easy to Confuse With Its Partner Component

On the Ford Focus Mk3, the master and slave clutch cylinders work as a pair, and symptoms of failure look almost identical from the driver's seat — a soft pedal, a clutch that won't disengage properly — which means diagnosing which one has actually failed usually needs a proper inspection rather than guesswork.

Before you buy: some versions of the Focus Mk3 use an internal slave cylinder built into the gearbox, others use an external unit — these are not interchangeable. Always confirm against your VIN before ordering.

Ford Focus Mk3 Slave Clutch Cylinder reference plate

Ford Focus Mk3 Slave Clutch Cylinder: OEM Part Number

Accuracy note: the Mk3 Focus uses a "concentric slave cylinder" design on many engines, meaning the slave cylinder and clutch release bearing are combined into a single assembly rather than sold as separate parts — confirm which design your engine uses before ordering.

2.0 EcoBoost turbo (2013–2018)	Ford OEM: DV6Z-7A508-A
Clutch release bearing & slave cylinder assembly (2015–2018)	Ford OEM: CM5Z-7A564-A
Focus RS 2.3 EcoBoost	Ford OEM: 1819390

Because many Mk3 engines use a combined concentric slave cylinder and release bearing, replacing this part usually means removing the entire transmission to access it — a genuinely bigger job than a traditional external slave cylinder, and one reason many owners replace the clutch kit and slave cylinder together rather than waiting for the slave cylinder to fail separately.

Ford Focus Mk3 Slave Clutch Cylinder: What It Does

The slave cylinder receives hydraulic pressure from the master cylinder and uses it to physically push the clutch release mechanism, disengaging the clutch when the pedal is pressed. On many modern cars including several versions of the Focus Mk3, this is built inside the transmission housing as a "concentric slave cylinder," which changes both the part itself and the labour involved in replacing it.

Fitment & Compatibility

Whether the Focus Mk3 uses an internal (concentric) or external slave cylinder depends on the specific generation and transmission — these two designs are not interchangeable, and use entirely different part numbers and replacement procedures. Always confirm which type your specific car uses before ordering. Whether you're sourcing a replacement slave clutch cylinder for your Ford Focus Mk3 from a dealer, specialist, or online marketplace, always check compatibility against your registration or VIN before buying.

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Ford Focus Mk3 Slave Clutch Cylinder: Symptoms, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Slave Clutch Cylinder Guide for symptoms of failure, how difficult this job is to DIY, and aftermarket advice.