Replace the original pressure piston with a model-specific upgrade for precise operation and high-quality finish
The clutch pressure piston, also called the clutch slave cylinder, converts the hydraulic pressure from the clutch lever into movement of the clutch pin. This compact component plays an important role in clutch operation. In this collection, you will find model-specific clutch pressure pistons for Ducati and KTM motorcycles, among others.
The range mainly consists of clutch pressure pistons from CNC Racing. Besides different colors and designs, there are versions with various piston diameters. For Ducati models, diameters of 28 and 30 mm are common, while specific 28.5 mm versions are available for certain KTM models.
A larger piston diameter can reduce the force required at the clutch lever. This makes the operation feel lighter, which can be especially comfortable in city traffic, during longer rides, and on motorcycles with relatively heavy clutch operation. However, the exact change in lever force and engagement point varies depending on the motorcycle, pressure piston, and chosen diameter.
Always select a clutch pressure piston based on the exact motorcycle model, year of manufacture, and hydraulic system. A version that looks similar may have a different bore, mounting, connection, or stroke length. Technical changes may also have been made within the same motorcycle series.
For certain older Ducati models, a spacer may be required to ensure correct operation of the pressure piston. This spacer may be included with model-specific products, but always check the delivery contents of the specific product.
For KTM motorcycles, it is especially important to check which type of hydraulic fluid is used. Separate pressure pistons exist for systems with DOT brake fluid and for systems with mineral hydraulic fluid. These versions use different seals and must not be filled with the wrong fluid.
Therefore, check the information on the reservoir, in the workshop manual, and with the chosen pressure piston. Mixing DOT brake fluid and mineral fluid can damage seals and cause failure or leakage of the clutch system.
After installation, the hydraulic system must be carefully filled and bled. Trapped air can cause a spongy lever, insufficient disengagement, or a varying engagement point. Also check the line, banjo bolt, sealing rings, and connection for leaks.
Use only the prescribed hydraulic fluid and follow the installation data from the motorcycle and parts manufacturer. Test the clutch after installation while stationary and check that the gears can be engaged correctly before riding.
