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Caliper Seals |Pistons
Rear Brake Caliper Piston and Seal Kit
1 kit per caliper - 2 required per car
Comprehensive rear brake caliper piston and seal kit designed for Porsche 928 S4, 928 GTS, 928 GT, and Porsche 944 turbo models up to VIN 95KN1 00218. This complete rebuild kit includes both pistons and sealing components, making it ideal for restoring full braking performance.
Fits:
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Kit contains
2 x 30mm caliper pistons
2 x 28mm caliper pistons
2 x 30mm piston dust covers
2 x 28mm piston dust covers
2 x 30mm piston seals
2 x 28mm piston seals
2 x bleed nipples and covers.
This ensures full compatibility with the rear caliper configuration and enables
a complete overhaul.
Manufactured to OEM standards, this kit restores hydraulic integrity, ensures smooth piston operation, and protects against contamination—delivering reliable and consistent braking performance. Ideal for restoration, maintenance, or professional brake system rebuilds.
Key Features
• Rear brake caliper piston and seal kit
• Designed for Porsche 928 & 944 Turbo rear calipers
• Complete rebuild solution for performance restoration
• OEM-quality materials for durability and reliability
Function and Purpose
This complete kit is essential for restoring rear brake caliper performance.
It helps to:
• Replace worn or corroded pistons
• Restore hydraulic sealing within the caliper
• Maintain consistent braking pressure
• Ensure smooth piston movement and operation
• Protect internal components from dirt and moisture
Why Replace Pistons & Seals Together
Over time, both pistons and seals wear 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 long-lasting repair.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
951908228
The product you are viewing cross references to these numbers
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Shop Securely
12 Month Warranty
Worldwide Delivery
Rear Brake Caliper Seal Kit
1 kit per caliper - 2 required per car
Premium rear brake caliper seal kit designed for
Porsche 928 S4, 928 GTS, 928 GT, and Porsche 944 turbo models up to VIN 95KN1
00218. This comprehensive kit includes seals for the two piston sizes to suit the rear
caliper configuration, ensuring correct fitment and reliable performance.
Fits:
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
The kit contains
2 x 30mm piston dust covers
2 x 28mm
piston dust covers
2 x 30mm piston seals
2 x 28mm piston seals
2 x bleed
nipple covers
Engineered to OEM standards, these components ensure proper hydraulic sealing, protect against dirt and moisture ingress, and support smooth piston movement for consistent braking performance. Ideal for maintenance, repair, or restoration of Porsche braking systems.
Key Features
• Designed for Porsche 928 & 944 turbo rear calipers
• Maintains hydraulic pressure and piston protection
• Prevents contamination and corrosion
• OEM-quality materials for durability and reliability
Function and Purpose
This seal kit is essential for maintaining rear brake caliper performance and safety.
It helps to:
• Seal brake fluid within the caliper
• Protect pistons from dirt, debris, and moisture
• Maintain consistent braking pressure
• Ensure smooth and balanced piston movement
• Prevent corrosion and internal damage
Why Replace Rear Caliper Seals
Brake seals degrade over time due to heat, pressure, and exposure to the elements.
Common issues include:
• Brake fluid leaks
• Reduced braking efficiency
• Sticking or seized pistons
• Uneven brake pad wear
• Corrosion caused by moisture ingress
Replacing worn seals restores braking performance, safety, and reliability.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
951009228
The product you are viewing cross references to these numbers
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Shop Securely
12 Month Warranty
Worldwide Delivery
Titanium is a very poor conductor of heat, and reduces the heat transfer by approximately 90%
The standard aluminum brake pistons are light but very heat conductive which means the thermal energy from the brake pad transfers easily to the brake fluid.
The castellated contact edge promotes airflow into the piston cavity and reduces the contact surface with the pad and thus further decreases heat transfer to the brake fluid.
We designed using advanced engineering simulations (FEA) to achieve the same weight than their aluminum counterparts while maintaining superior structural strength.
As opposed to stainless steel pistons, our titanium alloy pieces weigh the same as the original aluminum pistons; and they will never corrode and damage the seals causing the caliper to leak.
Price is per pair of pistons
**Please check the piston diameter you need as some calipers take two different sizes. Sizes shown are the piston outer diameter (OD)
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
SL-BKP-
The product you are viewing cross references to these numbers
Shop Securely
12 Month Warranty
Worldwide Delivery
Porsche Caliper Seals & Pistons | Design911 Precision Hydraulic Components for Restoring Braking Power & Reliability
Caliper seals and pistons are vital hydraulic components in your Porsche’s braking system, ensuring smooth, consistent, and powerful brake performance. The piston transfers hydraulic pressure to the brake pads, while the seals maintain fluid integrity, preventing leaks and contamination. Over time, wear, heat, and moisture can compromise these parts — reducing braking efficiency and safety. Replacing caliper seals and pistons is essential for maintaining consistent pressure, pedal feel, and reliability.
At Design911, we offer a comprehensive range of caliper seals and pistons, engineered for precision fitment and durability. Each component is crafted from high-grade materials designed to resist corrosion, heat, and hydraulic fluid degradation. Perfect for servicing, performance upgrades, or complete caliper restoration, these components restore your Porsche’s braking response and ensure long-term dependability.
What Do Caliper Seals & Pistons Do?
These two components work together to create and maintain the hydraulic pressure that powers your Porsche’s braking system.
Core Functions:
• Pistons convert hydraulic pressure into clamping force against the brake
pads.
• Seals prevent brake fluid leakage and maintain system pressure.
• Ensure smooth piston retraction for consistent pad contact.
• Protect against contaminants, moisture, and corrosion.
• Maintain balanced braking and pedal feel across all wheels.
High-quality seals and pistons ensure your Porsche delivers the stopping power, responsiveness, and control expected of its engineering pedigree.
Why Do Caliper Seals & Pistons Fail or Degrade?
Due to their exposure to heat, pressure, and environmental factors, these parts naturally deteriorate over time — especially in performance or high-mileage vehicles.
Common Causes of Failure Include:
• Seal wear or cracking from age and fluid degradation.
• Corrosion or pitting on pistons caused by moisture ingress.
• Brake fluid contamination leading to swelling or hardening.
• Heat damage from aggressive braking or track use.
• Improper installation or infrequent brake servicing.
When seals or pistons fail, symptoms such as fluid leaks, uneven braking, or sticking calipers can occur — compromising braking safety and performance.
Why Replace or Upgrade Your Porsche Caliper Seals & Pistons?
Replacing these components restores full hydraulic integrity and smooth brake operation. Design911’s premium-grade seals and pistons are designed for longevity, precision, and compatibility across Porsche models — ensuring reliability under road or track conditions.
Key Benefits:
• Restores consistent braking pressure and pedal feel.
• Prevents leaks and contamination in the hydraulic system.
• Improves caliper response and even brake pad wear.
• Manufactured from corrosion- and heat-resistant materials.
• Direct-fit design for fast, accurate installation.
• Ideal for restorations, rebuilds, or performance upgrades.
Design911’s Porsche caliper seals and pistons deliver unmatched performance and durability, helping your Porsche maintain the sharp braking response it was built for.
Highlights
• High-quality Porsche caliper seals and pistons for all
models.
• Precision-engineered for hydraulic efficiency and longevity.
• Resistant to corrosion, high heat, and fluid degradation.
• Essential for brake caliper rebuilds or restorations.
• Improves pedal feel and braking consistency.
• Perfect for classic and modern Porsche vehicles.
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Brake Pads & Disc Package
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Brake Disc Standard
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Brake Pads Standard
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SPORTS Brake Disc
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Brembo Standard brakes
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Brembo Racing brakes
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TEXTAR Brakes
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PAGID Racing Brakes
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Zimmermann Brakes
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Performance Friction Brakes
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EBC Brakes
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Black Diamond Performance Brakes
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Brake Pad Wear Sensors
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Brake Pad Anti-vibration shims
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Caliper Bolts / Disc Screws
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Pin Kit and Guide Plates
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Performance Brake Hoses
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Standard Brake Hoses
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Caliper and Brake Lines
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Brake Calipers
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Brake Caliper Upgrades
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Handbrake Shoes
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Handbrake Cables
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Brake Disc Cover Plates
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ABS | Speed Sensors
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Brake Servo | Booster
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Brake Master Cylinder
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Brake Fluid Reservoir
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Brake Fluid
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DesignTek Brake Kits
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Saturday: Closed
Sunday: Closed