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- Porsche 911 1978-1989 3.3L Turbo (930)
Brake Caliper Piston Scraper Ring
The OE Match Brake Caliper Piston Scraper Ring is a
replacement dust protection component for the front brake calipers fitted to
Porsche 911 Turbo (930) 3.3L models manufactured between 1978 and 1989.
Fits:
- Porsche 911 1978-1989 3.3L Turbo (930)
Diagram ref no 37
Designed for front brake calipers with 38mm pistons, this scraper ring helps protect the piston and surrounding sealing area from brake dust, dirt, moisture and road contamination.
A damaged or deteriorated scraper ring can allow contaminants to accumulate around the brake piston, increasing the risk of corrosion, sticking pistons and reduced braking performance.
What Does the Brake Caliper Piston Scraper Ring Do?
The scraper ring forms a protective barrier around the brake caliper piston, helping prevent dirt, moisture and brake dust from entering the area between the piston and caliper body.
As the piston moves during braking, the scraper ring helps keep its exposed surface protected from contamination.
This is particularly important on high-performance braking systems such as those fitted to the Porsche 911 Turbo, where brake components are exposed to considerable heat and demanding operating conditions.
The scraper ring is separate from the internal hydraulic piston seal, which is responsible for retaining brake fluid pressure.
Why Does It Fail?
Brake caliper piston scraper rings are exposed to high temperatures, road debris and repeated piston movement.
Common causes of deterioration include:
Age-related hardening or cracking Heat damage from prolonged or heavy braking Contamination from road dirt and brake dust Moisture and corrosion around the piston Damage during brake pad replacement Incorrect installation or previous caliper repairs General wear after years of serviceOnce damaged, the scraper ring may no longer provide effective protection against contamination.
When Should It Be Replaced?
Replacement is recommended whenever the scraper ring becomes cracked, torn, hardened, loose or otherwise damaged.
Common signs that inspection or replacement may be necessary include:
Visible deterioration around the brake piston Corrosion developing on the piston surface Sticking or difficult-to-retract brake pistons Uneven brake pad wear Brake drag or overheating Contamination around the piston and caliper boreThe scraper rings should also be inspected during brake caliper refurbishment, piston replacement or a complete braking system restoration.
Related Brake Caliper Components
For a complete front brake caliper overhaul, the following components may also require replacement:
Front brake caliper piston sealing ring – 93035155501 Front brake caliper scraper ring – 93035154700 Front brake caliper seal repair kit – PO-930FBCKITThe front caliper repair kit contains four scraper rings and four hydraulic piston sealing rings, sufficient to rebuild one front caliper.
Installation Notes
Inspect the brake caliper piston for corrosion, scoring or other damage before fitting the replacement scraper ring.
A new scraper ring will not correct problems caused by a damaged piston or defective hydraulic seal.
Ensure all components are correctly seated and installed using the appropriate Porsche brake caliper servicing procedure.
Brake caliper repairs should be carried out by a suitably qualified technician, with the braking system thoroughly checked before the vehicle is returned to service.
Porsche 911 Turbo 930 Brake Caliper Scraper Rings, Piston Seals & Repair Parts
The front brake calipers fitted to Porsche 911 Turbo 930 models rely on correctly functioning pistons, hydraulic seals and protective scraper rings to maintain reliable braking performance.
Over time, exposure to heat, moisture and road contamination can cause the original scraper rings to deteriorate, allowing dirt to reach the brake piston surface and potentially contribute to corrosion or restricted piston movement.
OE Match brake caliper piston scraper ring provides a replacement solution for Porsche 911 Turbo 3.3L models manufactured between 1978 and 1989, front calipers with 38mm pistons.
Replacing damaged scraper rings during routine brake maintenance or caliper refurbishment helps protect internal components and supports long-term braking system reliability.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93035154700
The product you are viewing cross references to these numbers
Price is each seal
**Please check the piston size you need as some callipers take two different sizes.
Fits:
Various Models
Price is each seal
Related reference numbers
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1055955
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- Porsche 958 Cayenne Turbo V8 4.8L Petrol (500Hp) 2010-17
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- Porsche 970.1 Panamera 4 V6 3.6L 4WD 2009-13
- Porsche 970.1 Panamera S V8 4.8L 2009-13
- Porsche 970.1 Panamera 4S V8 4.8L 2009-13
- Porsche 970.1 Panamera GTS V8 4.8L 2011-13
- Porsche 970.1 Panamera Turbo V8 4.8L 2009-13
- Porsche 970.1 Panamera Turbo S V8 4.8L 2009-13
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- Porsche 970.1 Panamera S Hybrid V6 3.0L 2011-13
REAR
Porsche 991 3.4L / 3.8L 2012>>
Porsche Carrera GT 2004-06
Porsche 958 Cayenne 2011>>
Porsche 970 Panamera 2010>>
Click 'Zoom in' for large parts diagram.
Diagram ref no 9
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99635191500
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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