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Clutch Master Cylinder
Molub-Alloy Paste White T – High Performance Assembly & Anti-Fretting Paste
Molub-Alloy Paste White T is a premium high-performance assembly paste designed to provide exceptional protection against fretting corrosion, stick-slip, wear, and seizure in demanding automotive, industrial, and workshop applications.
This white assembly paste applies cleanly and appears almost colourless when spread as a thin layer, making it ideal for precision assembly work where cleanliness and protection are equally important.
Formulated for universal assembly and thin-film lubrication applications, Molub-Alloy Paste White T helps simplify component assembly and future disassembly while protecting contact surfaces against corrosion, vibration-related wear, and moisture ingress.
Its advanced formulation provides excellent resistance to both hot and cold water while delivering long-lasting corrosion protection under harsh operating conditions.
Particularly effective in applications exposed to vibration and frictional movement, the paste helps prevent fretting corrosion and reduces stick-slip behaviour, making it ideal for hydraulic cylinders, open lubrication points, threaded assemblies, sliding surfaces, and mechanical components subject to oscillating movement.
The product also helps eliminate squeaking noises and improves smooth operation in moving assemblies exposed to high loads and thermal stress.
Suitable for temperatures ranging from -30°C to +250°C, Molub-Alloy Paste White T delivers reliable lubrication and anti-corrosion performance across a wide range of workshop, automotive, and engineering environments.
Key Features
• High-performance white assembly paste
• Prevents fretting corrosion and surface wear
• Clean application with almost colourless thin-film appearance
• Helps simplify assembly and future disassembly
• Excellent anti-seize and separating properties
• Resistant to hot and cold water
• Reduces stick-slip and frictional vibration
• Helps eliminate squeaking noises
• Provides long-lasting corrosion protection
• Suitable for hydraulic cylinders and moving assemblies
• Wide operating temperature range from -30°C to +250°C
• Suitable for automotive, engineering, and industrial applications
Applications
Molub-Alloy Paste White T is ideal for:
• Assembly lubrication
• Anti-fretting protection
• Threaded fasteners and fittings
• Hydraulic cylinders
• Sliding and contact surfaces
• Open lubrication points
• Components exposed to vibration
• Mechanical assemblies requiring anti-seize protection
• Automotive workshop applications
• Industrial machinery and engineering assemblies
Why Use Molub-Alloy Paste White T?
Mechanical components exposed to vibration, friction, heat, and moisture can suffer from fretting corrosion, seizure, stick-slip, and accelerated wear.
Molub-Alloy Paste White T helps protect components by:
• Reducing friction between contact surfaces
• Preventing corrosion and seizure
• Improving assembly and removal
• Minimising vibration-induced wear
• Protecting against moisture and contamination
This makes it ideal for long-term component protection and reliable assembly work.
Temperature Performance
Designed for demanding operating conditions, Molub-Alloy Paste White T remains effective across a wide temperature range:
• Operating temperature: -30°C to +250°C
• Suitable for hot and cold operating environments
• Maintains lubrication and protection under thermal load
Clean & Professional Assembly Solution
Unlike darker anti-seize compounds, this white assembly paste offers a cleaner, more professional appearance during application and servicing.
Benefits include:
• Cleaner working environment
• Reduced visible residue
• Easier inspection during assembly
• Professional workshop finish
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12 Month Warranty
Worldwide Delivery
The Porsche Clutch Master Cylinder Feed Line 99642314701 is a genuine replacement hydraulic fluid supply line for left-hand-drive Porsche 986 Boxster and 996 models with a manual transmission.
Fits:
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKII 2003>>
Diagram Ref No 2
The feed line forms part of the hydraulic clutch system and supplies brake/clutch fluid to the clutch master cylinder. This allows the master cylinder to generate hydraulic pressure when the clutch pedal is pressed, ultimately operating the clutch release mechanism.
Designed to follow the original Porsche routing and connection arrangement, this genuine replacement is suitable for renewing a feed line that has become brittle, cracked, damaged or is leaking with age.
What This Product Does:
The hydraulic clutch system relies on a continuous supply of fluid to operate correctly.
The feed line connects the fluid supply to the clutch master cylinder. When the clutch pedal is depressed, the master cylinder uses this fluid to create hydraulic pressure, which is then transferred through the pressure line to the clutch slave cylinder and release mechanism.
Its main functions include:
- Supplying hydraulic fluid to the clutch master cylinder
- Maintaining a sealed fluid connection
- Ensuring the master cylinder has an uninterrupted fluid supply
- Supporting smooth clutch engagement and disengagement
- Helping maintain consistent clutch pedal operation
- Supporting reliable gear changes
- Maintaining the factory hydraulic-line routing
- Helping prevent fluid loss and air entering the clutch system
Unlike the high-pressure clutch pipeline, this component primarily serves as the feed or supply line to the master cylinder.
Symptoms Of Wear Or Failure:
Age, heat and prolonged exposure to hydraulic fluid can cause the original feed line to deteriorate.
Common symptoms that may indicate replacement is required include:
- Visible hydraulic fluid leakage
- Dampness around the feed line or its connections
- Cracks or splits in the line
- Hardened or brittle hose material
- Swelling or deformation
- Fluid level gradually falling
- Soft or spongy clutch pedal
- Inconsistent clutch pedal feel
- Clutch pedal failing to return normally
- Difficulty disengaging the clutch
- Difficulty selecting gears
- Air entering the clutch hydraulic system
- Fluid contamination around the clutch master cylinder
A soft clutch pedal or poor disengagement can also be caused by a worn master cylinder, slave cylinder, pressure line or air elsewhere in the hydraulic circuit, so the complete system should be inspected.
Why Replacement Matters:
The clutch master cylinder requires a reliable supply of hydraulic fluid to operate correctly.
If the feed line cracks or leaks, fluid can escape and air may enter the system. This can prevent the master cylinder from generating consistent hydraulic pressure and may lead to a soft pedal, incomplete clutch disengagement or difficulty selecting gears.
Continued fluid loss can eventually result in complete loss of hydraulic clutch operation, leaving the clutch unable to disengage.
Replacing a deteriorated feed line helps restore:
- A reliable hydraulic fluid supply
- Correct clutch master cylinder operation
- Consistent clutch pedal feel
- Smooth clutch disengagement
- Easier and more predictable gear selection
- Proper sealing of the clutch hydraulic circuit
- Correct factory line routing
Replacing a visibly aged or leaking line can also help prevent more disruptive clutch hydraulic failure later.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99642314701
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKII 2003>>
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 986 Boxster 1997-04
Porsche 996 C2, C4, GT2, GT3, Turbo 1998-05
Click 'Zoom in' for large parts diagram.
Diagram ref no 8
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99642310711
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
Shop Securely
12 Month Warranty
Worldwide Delivery
This hydraulic clutch pipe carries clutch fluid between the clutch master cylinder and the clutch slave (or release) mechanism. It is a vital part of the hydraulic clutch system that allows your clutch to disengage and re-engage smoothly when you press and release the clutch pedal. A properly functioning pipe ensures consistent hydraulic pressure and reliable clutch operation without leaks or loss of fluid.
Fits:
Porsche 986 Boxster 1997 - 12004
Porsche 996 C2, C4, GT2, GT3, Turbo 1998 - 2005
Diagram ref no 8
Hydraulic clutch pipe / clutch master cylinder to slave connection:
• Transfers hydraulic fluid under pressure from the master cylinder to the clutch release mechanism
• Maintains proper hydraulic sealing to prevent fluid leakage
• Supports smooth clutch engagement/disengagement
• Ensures consistent pedal feel and clutch performance
Replace this hydraulic clutch pipe if you notice:
• Visible fluid leaks
• Soft or spongy clutch pedal feel
• Inconsistent clutch engagement
• Cracks, corrosion, or swelling
• During clutch system service or master/slave cylinder replacement
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99642310810
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 986 Boxster 1997-04
Porsche 987.1 Boxster 2005-08
Porsche 987.2 Boxster 2009-12
Porsche 987C.1 Cayman 2006-08
Porsche 987C.2 Cayman 2009-12
Porsche 996 Carrera 1998-05
Porsche 996 GT3 1999-05
Porsche 997.1 Carrera 2005-08
Click 'Zoom in' for large parts diagram.
Diagram ref no 3
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99742313700
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 986 Boxster - 1997 to 2004
Porsche 996 - 1998 to 2005
Porsche 996 turbo / GT3 - 2000 to 2005
Porsche 997 GT3 - 2007 to 2012
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90037802901
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
Shop Securely
12 Month Warranty
Worldwide Delivery
Porsche Clutch Master Cylinders | Hydraulic Precision for Smooth Gear Engagement
The clutch master cylinder is a key component of your Porsche’s hydraulic clutch system. It converts pedal pressure into hydraulic force, sending fluid to the slave cylinder to engage or disengage the clutch. A properly functioning clutch master cylinder ensures smooth gear shifts, precise pedal feel, and reliable performance in every driving condition.
At Design911, we supply premium clutch master cylinders engineered to meet or exceed original performance standards. Built using high-grade materials and precision internal seals, each unit delivers consistent hydraulic pressure, long-term durability, and excellent pedal response.
Whether you’re restoring a classic Porsche or maintaining a modern model, our clutch master cylinders guarantee the performance, precision, and reliability your drivetrain demands.
What Does a Clutch Master Cylinder Do?
The clutch master cylinder forms the first stage of your Porsche’s hydraulic clutch system, transmitting driver input into fluid pressure for gear engagement.
Core Functions:
- Converts pedal movement into hydraulic pressure.
- Delivers fluid to the clutch slave cylinder for smooth disengagement.
- Ensures accurate clutch engagement for seamless gear shifts.
- Maintains pedal feel and consistent hydraulic response.
- Supports high-performance driving with precise modulation.
Without a fully functioning master cylinder, the clutch cannot disengage properly, leading to difficulty selecting gears or complete transmission failure.
Why Do Clutch Master Cylinders Fail or Wear Out?
Over time, hydraulic components experience wear from pressure cycles, fluid contamination, and heat exposure — eventually reducing clutch performance.
Common Causes of Failure Include:
- Internal seal wear or leakage.
- Corrosion from moisture in hydraulic fluid.
- Air ingress into the hydraulic system.
- Damaged piston or bore from debris or age.
- Fluid contamination reducing hydraulic efficiency.
When the master cylinder begins to fail, symptoms may include a soft or sinking clutch pedal, fluid leaks near the pedal, or difficulty shifting gears.
Why Replace Your Porsche Clutch Master Cylinder?
Replacing a worn or leaking clutch master cylinder restores precise pedal pressure, smooth gear changes, and long-term hydraulic reliability.
Key Benefits:
- Restores responsive clutch operation and pedal feel.
- Prevents clutch drag, slippage, or missed gear shifts.
- Ensures stable hydraulic pressure across the system.
- Reduces risk of air or fluid leaks in the clutch circuit.
- Compatible with Porsche 911, Cayman, Boxster, Panamera, Macan, and classic models.
- Ideal for daily driving, restorations, and motorsport applications.
For best performance, always replace clutch fluid and inspect the slave cylinder when fitting a new master cylinder.
Highlights
- Precision-engineered Porsche clutch master cylinders.
- Corrosion-resistant construction for long service life.
- Consistent hydraulic performance under pressure.
- Direct-fit replacement for Porsche clutch systems.
- Designed for reliability, responsiveness, and smooth shifting.
- Suitable for restoration, maintenance, or performance use.
Monday-Friday: 8.30am - 5.30pm (GMT)
Saturday: Closed
Sunday: Closed