BMW E39 Wilwood Clutch Master Cylinder Upgrade Kit

The Lantz Fab 7/8" Wilwood Clutch Master Cylinder Upgrade Kit eliminates shifting problems caused by an undersized factory hydraulic system. The larger 7/8" bore moves more fluid volume per stroke, ensuring complete disengagement of stock or heavy-duty aftermarket clutches for smooth, effortless gear changes.

Shipping & Availability:

• Free Domestic Shipping on all US orders.
• 100% In Stock: All parts are stocked on our shelves and ready to go.
• Fast Turnaround: Most orders ship out the very next business day.

Solves Drivability Issues

Stop fighting factory hydraulic limitations. This upgrade is designed to eliminate common manual transmission problems.

• Clutch Pedal Sticking: Stops the pedal from lagging or hanging on the floor during aggressive, high-RPM driving.
• High-RPM Shifting Issues: Restores rapid, crisp gear changes at the top of your rev range.
• Trouble Shifting: Prevents gear lockouts by ensuring the clutch pressure plate completely releases.

Premium Engineering Features

• Precision-Machined Wilwood Cylinder: Larger 7/8" bore assembly replaces undersized and restrictive plastic OEM units.
• Increased Hydraulic Displacement: Optimizes fluid volume to disengage stock, multi-disc, and heavy single-disc setups.
• One-Piece Laser-Cut Bracket: Crafted from rigid 6061 aluminum to ensure zero flex under heavy pedal pressure.
• Custom-Machined Pushrod: Tailored precisely to preserve standard OEM pedal geometry and stroke alignment.
• High-Strength Spherical Rod End: Rugged steel construction replaces the OEM failure prone plastic design.
• Model-Specific Pedal Bushings: Installs in the factory clutch pedal to adapt to the metal spherical rod end.
• Made in the USA Craftsmanship: Proudly designed, tested, and manufactured in the USA.

What's Included in the Box

• Fully assembled and ready to install
• Modified Wilwood 7/8" Clutch Master Cylinder
• Custom-Machined Master Cylinder Pushrod
• High-Strength Steel Spherical Rod End
• Model-Specific Clutch Pedal-to-Rod End Bushings
• One-Piece Laser-Cut 6061 Aluminum Mounting Bracket
• Your Choice of -3AN or -4AN Outlet Fitting
• Complete with Installation Hardware

Watch our complete Lantz Fab YouTube Overview to see the engineering, installation layout, and a full system walkthrough.

Installation Instructions

A QR code linking to the installation instructions will be included with your order. To view the instructions now, click here.

Customs & Duties

Your order may be subject to import duties and taxes (including VAT), which are incurred once a shipment reaches your destination country. Lantz Fab is not responsible for these charges if they are applied; they are your sole responsibility as the customer.

Right-Hand Drive Fitment

Our products are designed specifically to fit Right-Hand Drive (RHD) BMW applications. We do not guarantee fitment on Left-Hand Drive (LHD) applications.

Disclaimer

Our products are intended for off-road use only. We assume no liability for our products used outside of this guideline and expect you to consult your local and state laws for clarification.