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- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
This OE Match-standard brake caliper seal repair kit is engineered as a direct-fit replacement for the rear brake caliper sealing components on classic Porsche 911 models. This kit supplies the essential gaskets, seals and dust boots needed to rebuild the brake caliper’s sealing surfaces accurately.
Sold per caliper.
Porsche 911 1984-89 (Rear)
This kit is sold on a per-caliper basis - for reconstructing or refreshing one rear brake caliper’s internal seals and dust protection.
In a brake caliper, seals and dust boots play a critical role in maintaining hydraulic integrity and protecting internal components from dirt and moisture. Over time seals can harden, crack or shrink, leading to fluid leaks, reduced braking performance, and uneven pad wear. This kit provides the correct rubber components to refresh the caliper sealing surfaces, allowing pistons to move freely while maintaining fluid pressure and protecting against contamination.
Function
• Hydraulic Seal Function: Prevents brake fluid leakage from the caliper piston bore under pressure.
• Dust Protection: Dust covers keep contaminants out of the caliper internals, reducing corrosion and wear.
• Restore Performance: Helps return caliper piston travel and braking response to as-designed levels.
• Durability: rubber materials resist heat, fluid exposure and aging typical of high-stress brake system environments.
Brake caliper seals and dust boots wear with age and use. When the seals degrade, brake fluid can leak at the caliper piston, reducing hydraulic pressure, degrading braking performance, and potentially causing uneven pad wear or pulling under braking. Dust boots that are cracked or missing allow grit and moisture into the caliper bore, accelerating corrosion and piston binding. Replacing these with an OE Match kit helps restore correct brake function, maintain consistent pedal feel, and extend the life of your brake calipers.
Replace the brake caliper seal kit if you notice:
• Brake fluid leaks around the caliper piston seal.
• Spongy or inconsistent brake pedal feel.
• Uneven pad wear or reduced braking performance.
• Cracked, hardened or missing dust covers.
• During a full brake overhaul or rebuild.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91135290500
The product you are viewing cross references to these numbers
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
- Porsche Boxster Spyder / Spyder RS 718 4.0L 01/2019>>
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
- Porsche 991.1 GT3 3.8L (475 Bhp) 2014-16
- Porsche 991.1 GT3 RS 4.0L (500 Bhp) 2015-16
- Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19
- Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19
- Porsche Cayman GT4 3.8L 2015-16
- Porsche Cayman GT4 718 4.0L / GT4 RS 718 4.0L
Rear Brake Caliper Dust Cap & Seal Kit 4 Piston 34mm Rear Calipers
1 kit per caliper - 2 required per car
High-quality rear brake caliper dust cap and seal kit designed for the 4 piston rear brake calipers with 34mm pistons.
This complete rebuild kit restores braking performance, caliper sealing, and
piston protection on high-performance Porsche models.
Fits:
- Porsche Boxster Spyder 718 4.0L 01/2019>>
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII GT3 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
- Porsche 991.1 GT3 3.8L (475 Bhp) 2014-16
- Porsche 991.1 GT3 RS 4.0L (500 Bhp) 2015-16
- Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19
- Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19
- Porsche Cayman GT4 3.8L 2015-16
- Porsche Cayman GT4 718 4.0L
Please
verify piston diameter before ordering.
Kit includes
4 x 34mm piston dust caps
4 x 34mm piston
seals
2 x bleed covers
Manufactured to OEM specifications, these components ensure
precise fitment, reliable hydraulic sealing, and long-term durability. Ideal
for routine brake maintenance, performance servicing, or complete caliper
restoration.
Key Features
• Rear brake caliper dust cap and seal kit
• Suitable for 34mm pistons
• OEM-quality materials for durability and reliability
• Restores hydraulic sealing and piston protection
• Ideal for brake caliper rebuilds and servicing
• Suitable for road and performance applications
Function and Purpose
This kit is essential for rear brake caliper maintenance.
It helps to:
• Restore proper caliper hydraulic sealing
• Protect pistons from dirt and moisture contamination
• Maintain smooth piston movement
• Prevent brake fluid leaks
• Support consistent braking performance
Why Replace Brake Caliper Seals & Dust Caps?
Brake caliper seals and dust caps wear over time due to heat and contamination.
Common issues include:
• Brake fluid leaks
• Cracked or damaged dust caps
• Corrosion around pistons
• Reduced braking efficiency
• Sticking or uneven piston movement
Replacing seals and dust caps restores safe and reliable braking operation.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
718091234
The product you are viewing cross references to these numbers
- Porsche Boxster Spyder / Spyder RS 718 4.0L 01/2019>>
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
- Porsche 991.1 GT3 3.8L (475 Bhp) 2014-16
- Porsche 991.1 GT3 RS 4.0L (500 Bhp) 2015-16
- Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19
- Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19
- Porsche Cayman GT4 3.8L 2015-16
- Porsche Cayman GT4 718 4.0L / GT4 RS 718 4.0L
Rear Brake Caliper Piston & Seal Kit - 4 Piston 34mm
Rear Calipers
1 kit per caliper - 2 required per car
High-quality rear brake caliper piston and seal kit designed for Porsche 4 piston rear brake calipers with 34mm pistons. This complete rebuild kit restores braking performance, hydraulic sealing, and smooth piston operation on high-performance Porsche models.
Fits:
- Porsche Boxster Spyder 718 4.0L 01/2019>>
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII GT3 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
- Porsche 991.1 GT3 3.8L (475 Bhp) 2014-16
- Porsche 991.1 GT3 RS 4.0L (500 Bhp) 2015-16
- Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19
- Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19
- Porsche Cayman GT4 3.8L 2015-16
-
Porsche Cayman GT4 718 4.0L
Manufactured to OEM specifications, these components ensure precise fitment, excellent durability, and reliable braking performance. Ideal for routine maintenance, brake system servicing, or performance rebuilds on Porsche GT and turbo models.
Please
verify piston diameter before ordering.
Kit contains
4 x 34mm caliper pistons
4 x 34mm piston dust caps
4 x 34mm piston seals
2 x bleed covers
Please check piston diameters before ordering
Key Features
• Rear brake caliper piston and seal kit
• Designed for 4 piston rear brake calipers
• Suitable for 34mm pistons
• OEM-quality materials for reliability and durability
• Restores braking performance and hydraulic sealing
• Ideal for brake caliper rebuilds and maintenance
Function and Purpose
This kit is essential for restoring rear brake caliper operation.
It helps to:
• Replace worn or corroded caliper pistons
• Restore hydraulic sealing and pressure retention
• Maintain smooth piston movement
• Protect against dirt and moisture contamination
• Support consistent braking performance
Why Replace Brake Pistons & Seals?
Brake components wear over time due to heat, pressure, and contamination.
Common issues include:
• Brake fluid leaks
• Corroded or sticking pistons
• Uneven braking performance
• Reduced braking efficiency
• Damaged dust caps and seals
Replacing pistons and seals together restores braking reliability, safety, and caliper performance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
718989234
The product you are viewing cross references to these numbers
- Porsche Boxster Spyder / Spyder RS 718 4.0L 01/2019>>
- Porsche 991.1 GT3 3.8L (475 Bhp) 2014-16
- Porsche 991.1 GT3 RS 4.0L (500 Bhp) 2015-16
- Porsche 991.2 Speedster 4.0L (510Bhp) 2019
- Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19
- Porsche Cayman GT4 718 4.0L / GT4 RS 718 4.0L
Front Brake Caliper Seal Kit
1 kit per caliper - 2 required per car
Maintain the braking performance and reliability of your
Porsche with this Front Brake Caliper Seal Kit, designed for
high-performance Porsche GT and Spyder models equipped with 6-piston front
brake calipers.
Fits:
- Porsche Boxster Spyder / Sypder RS 718 4.0L 01/2019>>
- Porsche 991.1 GT3 3.8L (475 Bhp) 2014-16
- Porsche 991.1 GT3 RS 4.0L (500 Bhp) 2015-16
- Porsche 991.2 Speedster 4.0L (510Bhp) 2019
- Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19
- Porsche Cayman GT4 718 4.0L / GT4 RS 718 4.0L
Manufactured to high-quality specifications, this kit helps
restore proper caliper sealing performance, protecting internal brake
components from dirt, moisture, and contamination while ensuring smooth piston
operation and consistent braking performance.
Please
verify piston diameter before ordering.
Kit Contents
• 6 x 30mm piston dust covers
• 6 x 30mm piston seals
• 2 x bleed nipple dust caps
Ideal for routine brake maintenance, caliper refurbishment, restoration projects, and track-day preparation, this seal kit supports long-term brake system reliability in high-performance Porsche applications.
Key Features
• Front brake caliper seal kit
• Designed for Porsche 6-piston front brake calipers
• Helps restore brake caliper sealing performance
• Protects against dirt, moisture, and contamination
• Supports smooth piston operation and brake response
• Ideal for brake caliper rebuilds and servicing
• Suitable for road, fast road, and track applications
Why Rebuild Brake Calipers?
Over time, brake caliper seals and dust covers can deteriorate due to heat, moisture, road debris, and repeated high-performance braking.
Replacing worn seals helps:
• Restore smooth caliper piston movement
• Maintain proper hydraulic sealing
• Prevent brake fluid leaks
• Protect against contamination and corrosion
• Improve overall brake reliability and consistency
Routine brake caliper maintenance is especially important on high-performance Porsche GT and track-focused models.
Brake System Protection & Performance
This rebuild kit helps maintain proper caliper operation under demanding driving conditions.
Benefits include:
• Improved brake system reliability
• Enhanced piston sealing performance
• Better protection from moisture and debris
• Consistent brake feel and response
• Long-term caliper durability
Ideal for both road use and track-day preparation.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
991048230
The product you are viewing cross references to these numbers