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Hydraulic unit Genuine Porsche part 99735595593
• This part is brand new and unused.
• Please verify that it is 100% suitable for your specific vehicle before purchase to ensure compatibility.
Before purchasing thoroughly check part to confirm compatibility.
- We are unable to provide fitting details for this product at this time. Please contact us for further information.

Fits:
Porsche 997 3.8L C2S
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99735591011
The product you are viewing cross references to these numbers
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
Fits:
Porsche 997 GT2 2007-09
Porsche 997 GT2 RS 2010-13
Porsche 997 GT3 2007-11
Click 'Zoom in' for large parts diagram
Diagram ref no 4.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99735592390
The product you are viewing cross references to these numbers
- Porsche 997 MK1 GT3 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII GT3 2010-11
- Porsche 997 MKII GT2 RS 2011-13

Fits:
Porsche 997 C4S 3.8L 2005>>
Porsche 997 TURBO 2007>>
Porsche 997 GT3 2007-11
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99735591031
The product you are viewing cross references to these numbers
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 2007-09
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 2010-11
- Porsche 997 MKII Turbo 2010-13
The brake master cylinder converts driver pedal input into precise hydraulic pressure that activates the brake calipers. As a genuine Porsche component, it delivers the exact pedal feel, pressure balance, and braking response intended by Porsche engineers.
Fits:
Porsche 987.1 Boxster 2005 - 2008
Porsche 987.2 Boxster 2009 - 2012
Porsche 987C.1 Cayman 2006 - 2008
Porsche 987C.2 Cayman 2009 - 2012
Porsche 997.1 Carrera 2 2005 - 2008
Diagram ref no 5
Function: When the brake pedal is pressed, the master cylinder’s internal pistons generate hydraulic pressure and distribute brake fluid evenly to the braking circuits. This ensures consistent braking force, smooth modulation, and predictable stopping power under all driving conditions.
A failing master cylinder directly impacts braking safety. Internal seal wear or cylinder fatigue can reduce hydraulic pressure, leading to poor pedal feel and longer stopping distances. Replacing the unit with a Genuine Porsche master cylinder restores factory braking response, maintains system integrity, and preserves the vehicle’s original driving characteristics.
When to replace
Consider replacing the brake master cylinder if you experience:
• Soft, spongy, or sinking brake pedal
• Brake fluid leakage near the master cylinder or firewall
• Uneven or delayed braking response
• Brake warning lights related to hydraulic pressure
• Age-related wear on higher-mileage vehicles
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99735591000
The product you are viewing cross references to these numbers
- Porsche Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 MKII 2.9L 2009-2012
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12

Fits:
Porsche 997 3.6L C4
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99735591011
The product you are viewing cross references to these numbers
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MKII Carrera C4 3.6L 2009-12

Fits:
Porsche 997 C4S 3.8L 2005>>
Porsche 997 TURBO 2007>>
Porsche 997 GT3 2007-11
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99735591031
The product you are viewing cross references to these numbers
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 2007-09
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 2010-11
- Porsche 997 MKII Turbo 2010-13
OE Match quality replacement for the original Porsche unit referenced by part number 997.355.910.00 / 99735591000. The brake master cylinder converts the force applied to the brake pedal into hydraulic pressure that activates your brake calipers and slows the car. It ensures consistent braking force and modulation under daily driving or spirited use. Without a fully functioning master cylinder, braking performance can be compromised.
Fits:
Porsche 987.1 Boxster 2005 - 2008
Porsche 987.2 Boxster 2009 - 2012
Porsche 987C.1 Cayman 2006 - 2008
Porsche 987C.2 Cayman 2009 - 2012
Porsche 997.1 Carrera 2 2005 - 2008
Diagram ref no 5
Function: It houses pistons and seals that pressurize brake fluid and distribute appropriate pressure to front and rear brake circuits. When you press the brake pedal, this unit ensures the correct volume and pressure of fluid is sent through the lines for dependable stopping power.
Replacing a worn or failing master cylinder is critical for safe braking performance. Over time, internal seals deteriorate, leading to spongy pedal feel, reduced brake responsiveness, or loss of hydraulic pressure. Installing a high-quality OE Match unit restores proper brake pressure, improves pedal feel, and ensures consistent stopping power - essential for both everyday driving and performance scenarios.
When to replace
You should inspect and consider replacing your brake master cylinder if you notice any of the following:
• Brake pedal feels soft, spongy, or sinking
• Visible brake fluid leaks around the firewall or master cylinder
• Inconsistent brake pressure during stopping
• Warning lights on the dashboard indicating brake system issues
• Age-related wear or part has exceeded recommended service life
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99735591000
The product you are viewing cross references to these numbers
- Porsche Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 MKII 2.9L 2009-2012
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12

Fits:
Porsche 997.1 C4 / C4S 2005-08
Porsche 997.1 Turbo 2007-09 (not for GT2)
Porsche 997.2 C4 / C4S 2009-12 Cars with Ceramic brakes (option code: 450)
Porsche 997.2 Carrera GTS / 4 GTS 2009-12
Porsche 997.2 Turbo 2010-13
Porsche 997 GT3 2007-11
Click 'Zoom in' for large parts diagram.
Diagram ref no 17
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99735596900
The product you are viewing cross references to these numbers
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 2007-09
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 2010-11
- Porsche 997 MKII Turbo 2010-13
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