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Porsche > 997 (911) MK2 2009-2012 > 997 MKII Carrera C4 3.6L 2009-12 > Hydraulics >

Brake Servo

Brake Servo

DISPLAYING 1 to 3 (of 3 products)
Bellow For Brake Booster. Porsche 986 / 987 / 996 / 997.1 / 997.2 1997-12 - 99642326905
3
Bellow For Brake Booster. Porsche 986 / 987 / 996 / 997.1 / 997.2 1997-12
Special Order item
99642326905
Product Information
Product Information
Bellow For Brake Booster.

The Brake Booster Bellow is a small but vital component of your braking system. This protective rubber sleeve seals the brake booster pushrod where it connects to the brake pedal assembly, keeping the booster airtight and free from contamination.
Over time, the bellow can crack or tear, leading to vacuum leaks, reduced brake assist, or even premature brake booster failure. Replacing it with this genuine OEM Porsche part restores proper sealing, protects the booster internals, and ensures safe, consistent braking performance.

Fits:

  • 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 2009-2012
  • Porsche Boxster S 987 MKII 3.4L 2009-2012
  • 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
  • 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 997 Carrera 2 3.6L 2005>>
  • Porsche 997 Carrera 2S 3.8L 2005>>
  • Porsche 997 GT2 2007>>
  • Porsche 997 MKII Carrera C2 3.6L 2009>>
  • Porsche 997 MKII Carrera C4 3.6L 2009>>
  • Porsche 997 MKII Carrera C2S 3.8L 2009>>

What This Product Does:
The brake booster bellow is a protective rubber sleeve that fits onto the brake booster unit. Its purpose is to seal and protect the brake booster pushrod where it connects to the brake pedal assembly.

Functions:
  • Protects the brake booster internals from dust, dirt, and moisture.
  • Maintains an airtight seal for proper vacuum-assisted braking.
  • Ensures smooth operation of the pushrod and brake pedal connection.
  • Helps extend the life of the brake booster by preventing contamination.
 
Symptoms Of A Faulty Or Worn Bellow:
  • Hissing or vacuum leaks near the brake pedal.
  • Spongy or inconsistent brake pedal feel.
  • Reduced brake assist, making the pedal harder to press.
  • Dirt or debris contamination around the booster rod.
  • Visible cracks, splits, or deterioration in the rubber.

Why Replacement Matters:
The bellow is a small but important part of the brake system. A damaged or missing boot allows dust and moisture into the booster, which can lead to internal corrosion, vacuum leaks, and reduced braking performance.

Diagram Ref No 22



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99642326905
99642326905

The product you are viewing cross references to these numbers
Brake servo bellows. Porsche 997 - 99735596900
3
Brake servo bellows. Porsche 997
Special Order item
99735596900
Product Information
Product Information
Brake servo bellows.

porsche

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
99735596900

The product you are viewing cross references to these numbers
Brake servo seal. Porsche 996 / 997 / Boxster / Cayman / 970 Panamera - 99635590101
3
Brake servo seal. Porsche 996 / 997 / Boxster / Cayman / 970 Panamera
Special Order item
99635590101
Product Information
Product Information
Brake servo seal.

porsche

Fits:
Porsche 996 1998-05
Porsche 997.1 2005-08
Porsche 997.2 2009-12
Porsche 986 Boxster 1997-04
Porsche 987.1 Boxster 2005-08
Porsche 987.2 Boxster 2009-12
Porsche 987C.1 Cayman 2005-08
Porsche 987C.2 Cayman 2009-12
Porsche 970 Panamera 2010-16

Click 'Zoom in' for large parts diagram.
Diagram ref no 10

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99635590101
99635590101

The product you are viewing cross references to these numbers
DISPLAYING 1 to 3 (of 3 products)
Also found on these pages
About Brake Servo

High-Quality Brake Servo Units for Strong, Consistent and Safe Braking Performance

A brake servo—also known as a brake booster—is an essential part of the vehicle’s hydraulic braking system. It uses vacuum or pressure assistance to reduce the amount of force required on the brake pedal, allowing the driver to achieve strong, controlled braking with minimal effort. Whether used in classic models or modern braking systems, a healthy servo is critical for maintaining safe braking performance, predictable stopping distances and a comfortable pedal feel.

Brake servos are vital for both everyday driving confidence and high-demand situations where maximum braking efficiency is essential.

What a Brake Servo Does

Brake servos perform several key functions:

  • Amplify braking force using vacuum or hydraulic assistance
  • Reduce pedal effort, improving comfort and responsiveness
  • Ensure consistent braking pressure across varying driving conditions
  • Improve brake modulation, allowing smoother, safer braking
  • Support ABS and advanced braking systems by stabilising hydraulic pressure
  • Enhance emergency braking performance when rapid deceleration is required

Without a properly functioning brake servo, braking becomes harder, less predictable and potentially unsafe.

Why Brake Servos Commonly Fail

Brake servos can wear out or malfunction due to age, usage conditions and environmental factors. Typical causes of failure include:

  • Vacuum leaks in seals, diaphragms or hoses
  • Internal diaphragm rupture affecting assistance levels
  • Corrosion inside the servo housing from moisture intrusion
  • Check valve failure, causing loss of vacuum retention
  • Brake fluid contamination damaging internal components
  • Wear from sustained heavy braking in performance or towing environments
  • Heat and age-related degradation of rubber components

Failure symptoms often include a hard brake pedal, poor braking efficiency, hissing noises, long stopping distances or inconsistent pedal feel.

Why You Should Replace a Faulty Brake Servo

Replacing a worn or failing servo with a high-quality, precision-built alternative engineered to match original braking performance specifications is essential for driver safety and system integrity.

Advantages include:

  • Restored braking assistance and smoother pedal operation
  • Reduced stopping distances and improved safety
  • Reliable vacuum or hydraulic support under all driving conditions
  • Correct functioning of ABS and other brake control systems
  • Prevention of brake fade caused by excessive pedal effort
  • Enhanced driving comfort, especially in urban and stop-start conditions

A new servo unit dramatically improves braking consistency and ensures your vehicle remains safe and responsive

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