Hydraulic clutch systems on most modern manual-gearbox cars use a central clutch release — a concentric slave cylinder that sits inside the gearbox bellhousing, surrounding the input shaft. When the driver presses the clutch pedal, hydraulic pressure from the master cylinder extends the piston inside the release unit, which pushes directly against the pressure plate fingers to disengage drive. Because the unit lives inside the gearbox, replacement requires the gearbox to be removed, making it sensible to renew the entire clutch kit at the same time. A failing central release typically announces itself through a soft or spongy clutch pedal, fluid seeping into the bellhousing, or an inability to fully disengage the clutch even with the pedal pressed to the floor. Internal seal degradation is the common failure mode, accelerated by contaminated hydraulic fluid or operating temperatures in the bellhousing that exceed the seal rating. Valeo and Sachs are the two dominant original-equipment suppliers for central release units across Ford, Opel, and Renault platforms — their parts carry the same OE numbers as factory-fitted units and are manufactured to the same sealing and pressure specifications. Matching the OE number ensures the piston stroke and hydraulic port alignment are correct for your gearbox housing.
The central release unit OE number is tied to the specific gearbox model fitted to your engine variant, not the car model alone. Two versions of the same car with different engine outputs may use different gearboxes and therefore different concentric slave cylinders with differing piston diameters and stroke lengths. Use the vehicle selector to narrow down by make, model, and engine specification, then match the OE reference to confirm the correct hydraulic port position, piston stroke, and overall dimensions for your bellhousing design.
Yes — because the gearbox must come out to access the central release, replacing only the slave cylinder while leaving worn clutch plates in place is false economy. The labour charge for gearbox removal represents the bulk of the job cost, so fitting a complete clutch kit (disc, pressure plate, and release bearing) alongside the new central release spreads the workshop time cost across multiple parts. If your car has covered significant mileage and the clutch is at all uncertain, this combined replacement is standard practice.
OEM central release units from Valeo and Sachs are manufactured to specific seal-material grades and piston-stroke tolerances validated for the engine and gearbox combination. Quality aftermarket units from FTE or Schaeffler LuK carry the same OE cross-references and are built to equivalent hydraulic pressure ratings. Lower-grade alternatives may use inferior seal compounds that swell when exposed to modern DOT fluid chemistry, causing premature bypass or seizing — a failure that requires another full gearbox-out repair.
The pedal often becomes spongy or requires significantly more travel than usual before the clutch begins to disengage. In more advanced cases the clutch will not disengage fully even with the pedal pressed to the carpet, making gear changes graunchy or impossible. Hydraulic fluid loss inside the bellhousing is another symptom — clutch dust contaminated with fluid is visible during inspection. On some platforms a faint dragging or judder on pull-away can also indicate the release bearing surface is no longer tracking cleanly against the pressure plate fingers.
Showing 100 of 4,050 Central clutch release OE numbers. Enter the OE on the main OE search to jump to any reference.
