If you own a Porsche 996 (model years 1998–2004), chances are you’ll eventually need to replace or upgrade your brake calipers. Whether you’re dealing with a seized piston, faded finish, or simply want better stopping power, having the right part number is essential. This guide covers the OEM Porsche 996 caliper part numbers for all major variants, including the standard Carrera, Carrera 4, Turbo, GT3, and GT2. We also explain how to decode numbers and what to look for when buying replacements.
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Porsche WHT 004 571, Disc Brake Caliper Bolt
Why Caliper Part Numbers Matter
Porsche uses specific caliper part numbers to match each vehicle’s brake system. Using the wrong caliper can lead to improper fitment, brake imbalance, or even safety hazards. The 996 platform saw several brake system revisions, and the calipers differ between models and even between front and rear axles. The part number is stamped directly on the caliper body, usually near the brake line inlet or on the outer face. Before ordering, always verify the number on your existing caliper.
Front Caliper Part Numbers
996 Carrera / Carrera 4 (Standard Brakes)
The standard front caliper on the 996 Carrera and Carrera 4 is a four-piston fixed caliper made by Brembo. It uses a semi-metallic pad and a 322 mm rotor. The exact part numbers vary by production date:
- Left front (driver side, LHD): 996.351.425.xx
- Right front (passenger side, LHD): 996.351.426.xx
The last two digits (xx) indicate the revision. Common suffixes include 01, 02, 03, and 04. All are interchangeable, but newer revisions have improved seals and dust boots.
996 Turbo / GT2 (Big Red Calipers)
The 996 Turbo and GT2 use larger, more powerful calipers known as “Big Reds.” They feature six pistons and clamp a 330 mm rotor. These calipers are visually distinct with a red finish (though some later models were black). Part numbers:
- Left front: 996.351.427.xx
- Right front: 996.351.428.xx
If you’re upgrading from standard brakes to Turbo brakes, you’ll also need the matching rotors, pads, and possibly the brake master cylinder. The calipers themselves bolt directly to the standard spindle, but the rotor diameter increase requires different caliper brackets.
996 GT3 (Brembo GT-Style)
The 996 GT3 (generation 1 and 2) came with a track-oriented brake system. The front calipers are a monobloc design with four pistons, similar to later 997 GT3 units. Part numbers:
- Left front: 997.351.425.xx (note: these are shared with the 997.1 GT3)
- Right front: 997.351.426.xx
These calipers are lighter and stiffer than the standard Carrera units. They require a specific 330 mm rotor and different brake pad shape.
Rear Caliper Part Numbers
996 Carrera / Carrera 4 (Standard)
Rear calipers on the 996 are also four-piston units but smaller than the fronts, with a 299 mm rotor. Part numbers:
- Left rear: 996.352.425.xx
- Right rear: 996.352.426.xx
996 Turbo / GT2
The Turbo and GT2 rear calipers are the same size as the Carrera units but with a different internal piston arrangement to match the brake bias. They are often called “Big Blacks” because of their natural aluminum finish. Part numbers:
- Left rear: 996.352.427.xx
- Right rear: 996.352.428.xx
996 GT3
The GT3 rear calipers are identical to the Carrera rear units in terms of mounting and piston count, but they use a different pad shape and a slightly different bracket to accommodate the larger rotor (330 mm). The part numbers are the same as the Carrera rears (996.352.425/426) but with a later revision suffix.
Aftermarket Caliper Options
If you’re looking for better performance or a budget-friendly replacement, several aftermarket companies make calipers that fit the 996. These are often direct bolt-on replacements using the same brake pad shape and rotor dimensions.
Brembo
- Brembo HPK (High Performance Kit) – uses the same 4-piston design as OEM but with upgraded seals and stainless steel pistons.
- Part numbers vary by kit; check with the supplier for your specific model.
StopTech
- StopTech ST-40 and ST-41 calipers are popular for the 996. They use a 4-piston design and are available with different rotor sizes.
- Part numbers are kit-based: e.g., SG-40-004 for front left, etc.
Wilwood
- Wilwood superlite and Dynalite calipers can be adapted with bracket kits. They are lighter than OEM but require careful pad selection.
When buying aftermarket, make sure the calipers are designed for your specific axle and rotor size. Many aftermarket calipers are universal and require custom mounting brackets.
How to Verify Your Caliper Part Number
The part number is stamped into the caliper body. Clean the area around the brake hose banjo fitting or on the outside face. Use a flashlight and angle the light to read the number. It usually starts with 996 (or 997 for later models). If the number is worn, you can also find it on the inner side near the piston area.
Common Upgrade Paths
Standard to Turbo Brakes
Many 996 owners upgrade to Turbo calipers for better heat dissipation and initial bite. This is a relatively straightforward swap if you also purchase Turbo rotors (front: 996.351.045.xx, rear: 996.352.045.xx) and the correct brake pads (e.g., Pagid RS29 or OEM). You will also need the Turbo brake master cylinder if you experience a soft pedal.
Standard to GT3 Brakes
GT3 calipers offer less unsprung weight and better pedal feel. They require GT3-specific rotors and pads. The calipers bolt on to standard spindles, but the rotor size difference may need a caliper bracket (sold separately).
Where to Buy
Original Porsche calipers can be ordered from any Porsche dealer or online parts retailers that specialize in OEM parts. Rebuilt calipers from reputable suppliers are also an option – they often come with new seals, pistons, and paint at a lower cost. If you’re on a budget, used calipers from a salvage yard can work, but have them inspected and rebuilt before installation.
Final Recommendation
For a daily-driven 996 Carrera, sticking with OEM Brembo calipers (part numbers starting with 996.351.425/426 front and 996.352.425/426 rear) is the most reliable and cost-effective choice. If you track your car or want more aggressive braking, consider the Turbo or GT3 upgrade – but be prepared for the added cost of rotors, pads, and possibly a master cylinder. Always confirm your existing part number before ordering, and use OEM pads and rotors for the best street performance.
When in doubt, consult a Porsche specialist mechanic. They can identify your brake system by VIN and ensure you get the correct parts. Properly matched calipers are critical to your safety and your 996’s handling.