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- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
Rear Brake Caliper Piston and Seal Kit
1 kit per caliper - 2 required per car
Complete rear brake caliper piston and seal kit designed specifically for Porsche 993 turbo and Carrera 4S models. This all-in-one rebuild kit includes pistons and sealing components required to restore full braking performance and reliability.
Fits:
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
Please
verify piston diameter before ordering.
Kit contains
4 x 28mm caliper pistons
4 x 28mm piston dust caps
4 x 28mm piston seals
2 x bleed nipples and covers
Manufactured to OEM standards, this kit ensures proper hydraulic sealing, smooth piston operation, and long-term durability. Ideal for maintenance, restoration, or professional brake system rebuilds.
Key Features
• Rear brake caliper piston and seal kit
• Designed for Porsche 993 turbo & Carrera 4S rear calipers
• Complete rebuild solution with pistons and seals
• Maintains hydraulic pressure and performance
• OEM-quality materials for durability and reliability
Function and Purpose
This complete kit is essential for restoring rear brake caliper function.
It helps to:
• Replace worn or corroded pistons
• Restore hydraulic sealing within the caliper
• Maintain consistent braking pressure
• Ensure smooth and even piston movement
• Protect internal components from contamination
Why Replace Pistons & Seals Together
Brake components degrade over time due to heat, pressure, and corrosion.
Common issues include:
• Brake fluid leaks
• Seized or sticking pistons
• Uneven braking performance
• Corrosion on piston surfaces
• Reduced braking efficiency
Replacing both pistons and seals ensures a complete and reliable repair.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
993910228
The product you are viewing cross references to these numbers
- Porsche Boxster S 986 3.2L 1999-02
- 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
Front Brake Caliper Overhaul Kit - for Both Sides
Restore your Porsche's front braking system to factory
performance with this comprehensive OE Match Front Brake Caliper Overhaul
Kit, designed specifically for the Porsche 986 Boxster S and Porsche
996 fitted with Brembo front brake calipers. This complete rebuild kit
services both front brake calipers and contains everything required to
replace the critical wear components during a professional caliper
refurbishment.
Fits:
- Porsche Boxster S 986 3.2L 1999-02
- 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
Parts Diagram ref No's 8, 10, 11, 12, 13, 14, 15.
Manufactured to original equipment specifications and featuring premium Brembo piston seals, this overhaul kit restores braking efficiency, piston movement and weather protection while helping extend the service life of your original Brembo calipers.
Kit Contents
This complete front brake caliper overhaul kit services both
front calipers and contains:
- 4 x Ventilation Valve Caps
- 4 x Ventilation Valves (Bleed Nipples)
- 4 x Pan-Head Screws
- 2 x Repair Kits (Bolt, Spring & Retaining Clip)
- 4 x Protection Caps – 40mm
- 4 x Protection Caps – 36mm
- 4 x Brembo Piston Seals – 36mm
- 4 x Brembo Piston Seals – 40mm
- 1 x Left Caliper Connecting Line
- 1 x Right Caliper Connecting Line
Everything required to carry out a comprehensive overhaul of both front Brembo brake calipers.
What Does a Brake Caliper Overhaul Kit Do?
Over time, the seals, dust boots and service components inside the brake calipers deteriorate due to heat, age and repeated braking cycles. A caliper overhaul kit restores the internal sealing and protection of the caliper, allowing the pistons to operate smoothly and maintain consistent hydraulic pressure.
The overhaul restores:
- Correct piston sealing.
- Smooth piston movement.
- Protection against water and dirt ingress.
- Proper brake pad operation.
- Reliable hydraulic performance.
- Consistent braking performance.
- Long-term caliper reliability.
A professionally rebuilt caliper can often provide many more years of dependable service.
Why Do Brake Calipers Require Overhauling?
Brake calipers operate in one of the harshest environments
on the vehicle. Common causes of wear include:
- Heat generated during braking.
- Ageing and hardening of rubber piston seals.
- Dust boot deterioration.
- Moisture entering the caliper.
- Corrosion around the pistons.
- Contaminated brake fluid.
- Sticking pistons.
- Seized bleed nipples.
- General wear after high mileage.
Ignoring worn seals can eventually result in sticking brakes, uneven pad wear or brake fluid leaks.
When Should a Brake Caliper Be Rebuilt?
A caliper overhaul is recommended whenever:
- Brake pistons become stiff or seize.
- Dust boots split or perish.
- Brake fluid leaks develop.
- Uneven brake pad wear is evident.
- The calipers are removed for restoration.
- During a complete brake system refurbishment.
- The vehicle is being prepared for fast road or track use.
- As preventative maintenance on ageing vehicles.
Rebuilding both front calipers at the same time ensures balanced braking performance across the axle.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
CALIPERKIT05
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster 986 2.7L 2003-04
Front Brake Caliper Overhaul Kit - for Both Sides
Restore the performance of your Porsche braking system with
this OE Match Front Brake Caliper Overhaul Kit, designed specifically
for the Porsche 986 Boxster fitted with Brembo front brake calipers.
This comprehensive rebuild kit services both front brake calipers,
providing all the essential replacement components required to return your
calipers to factory operating condition.
Fits:
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster 986 2.7L 2003-04
Parts Diagram ref No's 8, 10, 11, 12, 13, 14, 15.
Manufactured to original equipment specifications and featuring premium Brembo piston seals, this complete overhaul kit restores hydraulic sealing, smooth piston movement and long-term reliability while helping extend the service life of your original Brembo calipers.
Kit Contents
This complete front brake caliper overhaul kit services both
front calipers and includes:
- 4 x Ventilation Valve Caps
- 4 x Ventilation Valves (Bleed Nipples)
- 4 x Pan-Head Screws
- 2 x Repair Kits (Bolt, Spring & Retaining Clip)
- 4 x Protection Caps – 40mm
- 4 x Protection Caps – 36mm
- 4 x Brembo Piston Seals – 36mm
- 4 x Brembo Piston Seals – 40mm
- 1 x Left Caliper Connecting Line
- 1 x Right Caliper Connecting Line
Everything required to professionally overhaul both front Brembo brake calipers.
What Does a Brake Caliper Overhaul Kit Do?
A brake caliper overhaul kit replaces the critical wear components inside the caliper, allowing it to function correctly and safely. New piston seals restore hydraulic sealing, while new dust caps protect the pistons from moisture, dirt and road debris.
The overhaul helps to:
- Restore smooth piston movement.
- Maintain correct hydraulic pressure.
- Prevent brake fluid leaks.
- Protect pistons from corrosion.
- Ensure even brake pad operation.
- Improve pedal feel and braking consistency.
- Extend the life of the original calipers.
A rebuilt caliper delivers braking performance much closer to factory condition while avoiding the cost of complete caliper replacement.
Why Do Brake Calipers Require Overhauling?
Brake calipers are continually exposed to heat, moisture and
contamination. Over time, internal components deteriorate. Common causes
include:
- Heat generated during repeated braking.
- Ageing and hardening of piston seals.
- Split or perished dust caps.
- Moisture entering the caliper.
- Corrosion around the pistons.
- Contaminated brake fluid.
- Seized or sticking pistons.
- Worn bleed valves.
- High mileage and long-term use.
Ignoring worn seals or damaged dust caps can eventually lead to uneven braking, fluid leaks and accelerated brake pad wear.
When Should a Brake Caliper Be Rebuilt?
A caliper overhaul is recommended whenever:
- Pistons begin sticking or seizing.
- Brake fluid leaks are present.
- Dust caps become cracked or damaged.
- Brake pads wear unevenly.
- The calipers are removed for refurbishment.
- During a complete brake system rebuild.
- Preparing the vehicle for fast road or track use.
- As preventative maintenance on older vehicles.
Rebuilding both front calipers together helps maintain balanced braking performance across the front axle.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
CALIPERKIT06
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- 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
Rear Brake Caliper Overhaul Kit for Both Sides
Restore your Porsche's rear braking performance with this
comprehensive OE Match Rear Brake Caliper Overhaul Kit, designed
specifically for the Porsche 986 Boxster and Porsche 996 Carrera 2 /
Carrera 4 fitted with Brembo rear brake calipers. This complete rebuild kit
services both rear brake calipers, providing every essential component
required to professionally refurbish your original calipers.
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 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
Parts Diagram ref No's 8, 10, 11, 12, 13, 14, 15.
Manufactured to original equipment specifications and featuring premium Brembo piston seals, this overhaul kit restores smooth piston movement, reliable hydraulic sealing and long-term protection against dirt, moisture and corrosion, helping extend the life of your original Brembo braking system.
Kit Contents
This complete rear brake caliper overhaul kit services both
rear calipers and includes:
- 4 x Ventilation Valve Caps
- 4 x Ventilation Valves (Bleed Nipples)
- 4 x Pan-Head Screws
- 2 x Repair Kits (Bolt, Spring & Retaining Clip)
- 4 x Protection Caps – 28mm
- 4 x Protection Caps – 30mm
- 4 x Brembo Piston Seals – 28mm
- 4 x Brembo Piston Seals – 30mm
- 1 x Left Caliper Connecting Line
- 1 x Right Caliper Connecting Line
Everything required to carry out a complete overhaul of both rear Brembo brake calipers.
What Does a Rear Brake Caliper Overhaul Kit Do?
A brake caliper overhaul kit replaces the critical internal sealing and service components that naturally deteriorate over time. Fresh piston seals restore hydraulic sealing, while new dust protection caps keep dirt, moisture and road debris away from the pistons, ensuring smooth and reliable operation.
The overhaul helps to:
- Restore smooth piston movement.
- Maintain correct hydraulic pressure.
- Prevent brake fluid leaks.
- Protect pistons from corrosion.
- Ensure even rear brake pad wear.
- Improve braking consistency.
- Extend the service life of the original calipers.
A professionally rebuilt caliper restores much of the original braking performance while retaining the factory Brembo calipers.
Why Do Rear Brake Calipers Need Rebuilding?
Rear brake calipers are constantly exposed to heat, moisture
and road contamination. Over time, service components begin to deteriorate.
Common causes include:
- Heat generated during braking.
- Ageing and hardening of piston seals.
- Perished or split dust caps.
- Moisture entering the caliper.
- Corrosion around the pistons.
- Contaminated brake fluid.
- Seized or sticking pistons.
- Worn bleed valves.
- General wear after years of service.
Ignoring worn seals can eventually lead to sticking calipers, uneven pad wear, brake fluid leaks and reduced braking efficiency.
When Should the Rear Brake Calipers Be Overhauled?
A complete rebuild is recommended whenever:
- Rear brake pistons become stiff or seize.
- Dust caps split or deteriorate.
- Brake fluid leaks develop.
- Rear brake pads wear unevenly.
- The calipers are removed for restoration.
- During a complete brake system refurbishment.
- Preparing the vehicle for fast road or track use.
- As preventative maintenance on higher mileage vehicles.
Rebuilding both rear calipers together ensures balanced braking performance across the rear axle.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
CALIPERKIT07
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
Brake Caliper Replacement Pistons for Brembo Calipers
Sold each
Restore the performance and reliability of your Porsche Brembo braking system with these OE Match Brake Caliper Replacement Pistons. Manufactured to original equipment specifications, these precision-engineered pistons are designed for rebuilding Brembo brake calipers fitted to a wide range of Porsche models.
Available in 28mm, 30mm, 32mm, 34mm, 36mm, 38mm, 40mm and 44mm outer diameters, every piston has an overall height of 32mm and is manufactured to deliver the correct fit, smooth operation and dependable sealing performance when used with new piston seals and dust boots.
Important: Please check the piston diameter required for your specific caliper before ordering. Many Brembo calipers use two different piston diameters within the same caliper to optimise braking performance. The sizes listed refer to the outer diameter (OD) of the piston.
What Does a Brake Caliper Piston Do?
The brake caliper piston is one of the most important components inside the braking system. Hydraulic brake fluid pressure pushes the piston forward, forcing the brake pad firmly against the brake disc to generate the friction required to slow or stop the vehicle.
Its primary functions include:
- Converting hydraulic pressure into braking force.
- Applying even pressure across the brake pads.
- Ensuring smooth and consistent piston movement.
- Maintaining balanced braking performance.
- Supporting Porsche ABS and stability control systems.
- Delivering precise pedal feel and braking response.
Correctly functioning pistons are essential for maintaining the powerful, progressive braking performance expected from Porsche Brembo calipers.
Why Do Brake Caliper Pistons Fail?
Brake caliper pistons operate in harsh conditions and are continually exposed to heat, moisture and brake dust. Over time they can become damaged or worn.
Common causes include:
- Corrosion caused by moisture ingress.
- Torn or damaged dust boots.
- Contaminated brake fluid.
- Surface pitting.
- Heat generated during heavy braking.
- Seized pistons caused by corrosion.
- Damage during previous repairs.
- High mileage and normal wear.
A damaged piston can prevent the caliper from operating correctly, leading to reduced braking performance and uneven brake pad wear.
Symptoms of a Worn or Damaged Caliper Piston
Common symptoms include:
- Sticking or seized brake calipers.
- Uneven brake pad wear.
- Vehicle pulling during braking.
- Reduced braking performance.
- Overheating brakes. Brake drag.
- Fluid leaks around the piston seal.
- Difficulty retracting the piston during servicing.
Replacing damaged pistons during a caliper overhaul restores smooth operation and reliable braking performance.
When Should Brake Caliper Pistons Be Replaced?
Replacement is recommended whenever:
- Corrosion or pitting is visible.
- Pistons become seized or difficult to move.
- The caliper is being rebuilt.
- Dust boots have failed allowing contamination.
- Brake fluid leaks occur around the piston.
- Uneven pad wear is caused by sticking pistons.
- Restoring older Brembo brake calipers.
- During preventative maintenance on ageing braking systems.
For the best results, new pistons should always be installed with new piston seals and dust protection boots.
OE Match Quality You Can Trust
These OE Match Brake Caliper Replacement Pistons offer:
- Manufactured to original equipment specifications.
- Precision-machined finish.
- Excellent corrosion resistance.
- Smooth piston movement.
- Direct replacement fitment.
- Suitable for Brembo brake calipers.
- Available in 28mm, 30mm, 32mm, 34mm, 36mm, 38mm, 40mm and 44mm diameters.
- Uniform piston height of 32mm.
- Ideal for professional caliper rebuilding.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
1055955
The product you are viewing cross references to these numbers