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Porsche // 911 & 912 (1965-1989) // 911 1975-1977 3.0L Turbo (930)
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- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1978-1989 3.3L Turbo (930)
The Genuine Porsche Spacer Sleeve, Front / Rear (Part Number: 93035158001) is an original equipment brake caliper component designed for selected classic Porsche 911 Turbo (930) and Carrera Turbo Look (M491) models.
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Fits:
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1978-1989 3.3L Turbo (930)
Diagram Ref No 21
Also referred to as a brake caliper spacer sleeve, this component forms part of the fixed brake caliper assembly, where it is used in conjunction with the associated caliper fastening hardware.
The Porsche 930 Turbo braking system uses substantial fixed brake calipers designed to withstand the demanding conditions associated with high-performance driving.
Each caliper assembly contains several precisely positioned components, including the caliper housings, connecting bridges, fastening bolts, brake pistons and associated hardware.
The spacer sleeve is used within this assembly to help maintain the intended spacing and positioning of the relevant fastening components.
Manufactured to Porsche's original equipment specification, the sleeve is designed to provide the correct dimensions for its specified brake caliper application.
During braking, the caliper assembly experiences significant mechanical loading, vibration and repeated temperature changes.
The individual fastening and spacing components must remain correctly positioned to preserve the original caliper construction.
Although spacer sleeves do not contain moving parts, they may become damaged through corrosion, excessive tightening, mechanical stress or incorrect assembly during brake servicing.
A worn, distorted or missing spacer sleeve may affect the positioning or loading of the associated caliper fastening arrangement.
Replacing a damaged spacer sleeve with a Genuine Porsche component helps restore the specified caliper assembly configuration, maintain correct component spacing and support reliable brake system operation.
Ideal for Porsche 930 brake caliper refurbishment, brake system repairs and classic vehicle restoration, this Genuine Porsche Spacer Sleeve provides an original equipment replacement for compatible applications.
What This Product Does:
The spacer sleeve is a mechanical component used within the brake caliper fastening assembly.
Its primary function is to maintain the specified spacing and positioning of the associated caliper hardware.
The Porsche 930 Turbo fixed caliper assembly uses multiple fasteners to secure its individual structural components.
The spacer sleeves form part of this arrangement, helping maintain the intended relationship between the associated components when correctly assembled.
Their main functions include:
- Maintaining correct component spacing: Provides the intended separation at its specified caliper assembly location.
- Supporting caliper assembly positioning: Helps maintain the original arrangement of the associated fastening components.
- Supporting secure fastening: Works with the specified bolts and caliper hardware.
- Maintaining assembly geometry: Helps preserve the factory-designed positioning of the relevant components.
- Supporting consistent mechanical loading: Provides the intended spacing within the fastening arrangement.
- Preventing incorrect component contact: Helps maintain the required separation at the specified mounting location.
- Supporting brake caliper refurbishment: Allows damaged or missing sleeves to be replaced during servicing.
- Preserving original brake construction: Maintains the factory assembly configuration.
- Withstanding braking conditions: Operates within an assembly exposed to heat, vibration and mechanical stress.
- Supporting long-term reliability: Helps maintain correct assembly where the appropriate component is installed.
Symptoms Of Wear Or Failure:
Brake caliper spacer sleeves are generally durable components, but corrosion, incorrect installation or physical damage may affect their condition.
Because the sleeve is a passive mechanical component, a fault may not produce an immediately identifiable driving symptom.
Problems are often discovered during brake caliper dismantling, inspection or refurbishment.
Common signs of a damaged spacer sleeve include:
- Visible corrosion: Rust or surface deterioration may affect the component's condition.
- Distorted sleeve shape: Mechanical loading or incorrect tightening may cause deformation.
- Cracked material: Severe stress or physical damage may produce cracks.
- Excessive surface wear: Abnormal contact may leave visible wear marks.
- Flattened or damaged ends: Incorrect assembly or excessive compression may affect the sleeve's seating surfaces.
- Missing spacer sleeve: A previously serviced caliper may have been assembled without the required component.
- Incorrect sleeve dimensions: An unsuitable replacement may prevent the caliper from being assembled to its original specification.
- Uneven seating: A distorted spacer may prevent the relevant components from fitting correctly.
- Damaged fastening arrangement: A defective sleeve may be discovered alongside damaged caliper bolts or mounting surfaces.
- Abnormal caliper movement: Incorrect assembly or loose fastening hardware may allow unwanted mechanical movement.
- Rattling or metallic noises: Loose or incorrectly assembled caliper components may produce noise.
- Visible fretting marks: Movement between associated components may cause abnormal surface wear.
- Difficulty assembling the caliper: A damaged or incorrect sleeve may interfere with proper component alignment.
- Evidence of previous incorrect repairs: Missing, mismatched or incorrectly positioned sleeves may indicate improper assembly.
Why Replacement Matters:
Replacing a defective spacer sleeve is important for maintaining the correct mechanical arrangement of the brake caliper.
The brake caliper is a safety-critical assembly, and its individual fastening components must be installed according to the original Porsche specification.
A damaged, distorted or missing spacer may prevent the relevant caliper components from being assembled correctly.
Continued use of incorrectly assembled brake hardware can place unintended stress on surrounding components.
Installing a Genuine Porsche replacement Spacer Sleeve helps to:
- Restore correct component spacing: Replace a worn or distorted sleeve with the specified original equipment part.
- Maintain brake caliper assembly geometry: Preserve the intended positioning of associated components.
- Support secure fastening: Maintain the correct arrangement of caliper bolts and spacing hardware.
- Replace corroded components: Renew deteriorated sleeves during brake refurbishment.
- Prevent incorrect assembly: Replace missing or unsuitable spacers with the specified component.
- Reduce unwanted mechanical stress: Restore the original spacing arrangement where damage has occurred.
- Support caliper rebuilding: Provide an original equipment component during brake caliper restoration.
- Maintain factory specifications: Preserve Porsche's intended brake caliper construction.
- Protect surrounding components: Reduce the risk of incorrect contact or loading caused by damaged spacing hardware.
- Support brake system reliability: Maintain the integrity of the correctly assembled caliper.
- Preserve vehicle originality: Use Genuine Porsche components during classic brake restoration.
- Support long-term maintenance: Replace damaged hardware before the caliper is returned to service.
Replacement is particularly recommended when the sleeve is cracked, heavily corroded, distorted, missing or visibly worn.
If the brake caliper has suffered significant mechanical damage, the complete assembly should be assessed before deciding whether replacement of individual components is appropriate.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93035158001
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1975-1977 3.0L Turbo (930)
This is a factory-original Porsche locking or retaining pin, designed for the rear disc brake assembly on classic Porsche models. It secures key components within the rear brake disc and hand-brake calliper assembly, helping maintain correct positioning and fit of the hardware.
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Fits:
"S" Type caliper
Porsche 911 1965 - 1983
Porsche 911 (930) Turbo 3.0L 1975 - 1977
Diagram ref no17
Over time and many braking cycles, this type of pin can lose its secure fit due to heat, corrosion, wear or damage - especially in older vehicles which may have high mileage or have been exposed to the elements.
If the pin is worn, bent or missing, brake pad alignment or hand-brake performance may be compromised, which can lead to brake noise, uneven wear, or reduced pad life.
During any rear brake service, pad change, or brake assembly overhaul, replacing worn retaining/locking hardware is smart preventative maintenance and helps avoid bigger issues later.
When to replace it:
• Whenever you disassemble the rear disc brake caliper or hand-brake related components.
• At the time of pad replacement, hardware refresh, or when performing a restoration or full brake rebuild on a classic Porsche.
• If you notice symptoms such as pad movement, rattle, hand-brake dragging or uneven pad/disc wear at the rear.
• Especially on vintage Porsche models, maintaining original specification hardware like this helps preserve correct braking feel and authenticity.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90135299102
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
Related, superseded, cross reference or alternative numbers for comparison.
1055955
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 924 Turbo 2.0L 1979-81
- Porsche 924 Turbo 2.0L 1982-84
- Porsche 924 Carrera GT 2.0L 1981
- Porsche 924 Carrera GTS 2.0L 1982
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 914 (1970-1976)
REAR / FRONT
Porsche 911 / 912 1965-68 FRONT
Porsche 911T/912 1969 FRONT
Porsche 911T / 911T-V / 911 T-E / 911 E 1970-73 FRONT
Porsche 911 / 911S m-caliper 1974-77 FRONT
Porsche 911 1969-77 REAR
Porsche 911 SC 1978-83 REAR
Porsche 911 Carrera 1984-89 REAR
Porsche 911 Turbo 1975-77 REAR
Porsche 914-6 1970-76 FRONT
Porsche 914-6/4 SB 1970-76 REAR
Porsche 924 TURBO / GT 1976-85 REAR
Porsche 924 S 1986-88 REAR
Porsche 928 1978-86 REAR
Porsche 944 1982-89 REAR
Click 'Zoom in' for large parts diagram.
Diagram ref no 12.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90135297710
The product you are viewing cross references to these numbers
Brake Caliper Replacement Pistons for Brembo Calipers
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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