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Brake Booster

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DISPLAYING 1 to 4 (of 6 products)
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00004320466
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Product Information
Brake booster seal set / modification kit.
porsche

Fits:
Porsche 986 Boxster 1997-00
upto chassis numbers:
>> WP0ZZZ98ZYS600434
>> WP0ZZZ98ZYU600165
>> WP0ZZZ98ZYS640520
>> WP0ZZZ98ZYU640062

Porsche 996 1998-00
upto chassis numbers:
>> WP0ZZZ99ZYS600595
>> WP0ZZZ98ZYS640393

Porsche 996 GT3 1998-00
upto chassis numbers:
>> WP0ZZZ99ZYS690531

Click 'Zoom in' for large parts diagram.
Diagram ref no 18, 22, 27, 28, 29 and 30.

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00004320466
00004320466

The product you are viewing cross references to these numbers
Special Order item
99642330100
Product Information
Product Information
Brake booster seal.

porsche

Fits:
Porsche 986 Boxster 1997-04
Porsche 996 1995-08

Click 'Zoom in' for large parts diagram.
Diagram ref no 16

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99642330100
99642330100

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99635592300/2
Product Information
Product Information
Brake Booster.

This Brake Booster is a OE MATCH Porsche braking system component designed to enhance braking performance by using vacuum pressure to amplify brake pedal force. Mounted between the brake pedal assembly and the master cylinder, the brake booster reduces the physical effort required to apply the brakes, ensuring smooth, responsive, and controlled 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 S 3.2/3.4L 2005-08/08 (I450 - Cars With Ceramic Brake)
  • 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 Cayman S 3.4L 987C 2005-08 (I450 - Cars With Ceramic Brake)

Diagram Ref No 4

What This Product Does:
  • Amplifies brake pedal force using vacuum assistance
  • Reduces driver effort during braking
  • Improves braking responsiveness and control
  • Works with the brake master cylinder to generate hydraulic pressure
  • Enhances overall braking safety and performance

Symptoms Of Wear Or Failure:
  • Hard or stiff brake pedal requiring excessive force
  • Reduced braking efficiency or delayed response
  • Hissing noise caused by vacuum leaks
  • Increased stopping distance
  • Inconsistent brake pedal feel
  • Engine idle irregularities linked to vacuum system leaks     

Why Replacement Matters:
  • Restores proper brake assistance and pedal feel
  • Improves braking response and stopping performance
  • Prevents excessive strain on braking components
  • Eliminates vacuum leaks affecting engine and brake operation
  • Ensures safe and predictable braking under all driving conditions



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

99635592300
99635592300

The product you are viewing cross references to these numbers
Special Order item
99635592300
Product Information
Product Information
Brake Booster. Brake Booster. Porsche Boxster / Cayman / 996

porsche

Fits:
Porsche 986 Boxster 1997-04
Porsche 987 Boxster S 2005-08 (I450 - cars with Ceramic Brake)
Porsche 987C Cayman S / Cayman R 2005-08 (I450- cars with Ceramic Brake)
Porsche 996 Carrera 1998-05
Porsche 996 Turbo 2001-05

Click 'Zoom in' for large parts diagram
Diagram ref no 4

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

99635592300
99635592300

The product you are viewing cross references to these numbers
DISPLAYING 1 to 4 (of 6 products)
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About Brake Booster

High-Quality Brake Boosters for Safe, Effortless and Consistent Braking Performance

Brake boosters—also known as power brake boosters—are essential hydraulic components that amplify the force applied to the brake pedal. By using vacuum or hydraulic pressure assistance, the brake booster helps deliver strong braking performance with minimal driver effort. Whether driving a classic car or a modern performance vehicle, a properly functioning brake booster ensures predictable stopping distances, stable pedal feel and safe braking under all conditions.

A healthy booster is key to driving comfort, road safety and confidence—especially in emergency braking situations or repeated heavy braking.

What Brake Boosters Do

Brake boosters enhance braking capability by performing several critical functions:

  • Amplifying pedal input, providing stronger braking force with less effort
  • Improving braking response for smoother, quicker stopping
  • Maintaining stable brake pressure across varying driving conditions
  • Supporting ABS and advanced brake control systems
  • Reducing driver fatigue during heavy or frequent braking
  • Helping maintain consistent performance in both low-speed and high-speed situations

With a properly functioning booster, brakes feel more responsive, controlled and progressive.

Why Brake Boosters Commonly Fail

Brake boosters can wear out due to age, heat, vacuum loss or hydraulic issues. Common failure causes include:

  • Vacuum leaks from damaged hoses or internal seals
  • Diaphragm failure leading to loss of brake assistance
  • Internal corrosion caused by moisture buildup
  • Faulty check valves preventing vacuum retention
  • Brake fluid contamination damaging internal components
  • Heat-related degradation of diaphragms and seals
  • Wear due to high mileage or repeated heavy braking

Symptoms often include a hard brake pedal, increased stopping distances, hissing noises, inconsistent pedal feel or warning lights.

Why You Should Replace a Faulty Brake Booster

Replacing a worn or failing brake booster with a high-quality, precision-engineered alternative designed to match original braking performance ensures your vehicle remains safe and responsive.

Key benefits include:

  • Restored braking assistance and lighter pedal effort
  • Improved stopping power and safety in all conditions
  • Consistent pedal feel with predictable braking response
  • Prevention of brake fade due to excessive pedal force
  • Reliable operation of vacuum-dependent brake systems
  • Peace of mind during emergency or high-load braking situations

A new brake booster significantly improves braking comfort and reliability, making it an essential maintenance replacement for any vehicle with reduced brake assist.

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