Porsche 19Z Caliper Part Numbers: Complete Reference Guide

Porsche 19Z calipers are a popular upgrade for many Porsche models, offering excellent braking performance and a distinctive appearance. Whether you're replacing worn calipers or upgrading your brake system, knowing the correct part number is essential. This guide covers the most common 19Z caliper part numbers, fitment details, and practical advice for purchasing.

What Are Porsche 19Z Calipers?

The 19Z caliper is a six-piston monobloc design originally found on the Porsche 911 Turbo (996/997), Porsche Cayenne, and some other models. They are often used as brake upgrades for earlier Porsches because they offer increased stopping power and pad surface area. The "19Z" designation refers to the casting marking on the caliper body, which indicates the piston size (19mm) and the series.

Porsche 19Z Caliper Part Numbers Overview

Porsche 19Z calipers are typically identified by a part number starting with 955, 996, or 997. The exact number varies depending on the mounting side (left or right), color, and the vehicle application. Below are the most common part numbers.

Front Left (Driver Side) Part Numbers

• 955.351.421.00 – Standard black or silver finish for Cayenne and 911 Turbo applications.
• 955.351.421.01 – Possibly a later revision or color variant; verify with your VIN.
• 996.351.421.00 – Often used on 996 Turbo models.
• 997.351.421.00 – For 997 Turbo and some GT3 cars.

Front Right (Passenger Side) Part Numbers

• 955.351.422.00 – Same as left but mirrored.
• 955.351.422.01 – Revision/color variant.
• 996.351.422.00 – Right side for 996 Turbo.
• 997.351.422.00 – Right side for 997 Turbo.

Color Codes and Special Editions

Porsche also offers painted calipers with specific color codes as part of the options list. The base part number remains the same, but a suffix or different prefix might indicate color. Common colors for 19Z calipers include:

• Black – Standard, no special code.
• Silver – Often standard on Turbo models.
• Red – Available as an option (code RZ, but part number varies by region).
• Yellow – Rare, typically on high-performance variants.
• Guards Red – For some special editions.

If you need a specific color, you may have to purchase the caliper separately or have it painted. The part numbers listed above are for the basic caliper, usually in black or silver.

Fitment: Which Porsche Models Use 19Z Calipers?

19Z calipers were original equipment on:

• Porsche 911 Turbo (996, 997) – All 996 Turbo (2000-2005) and 997 Turbo (2006-2010) use 19Z front calipers. Some 997 GT3 and GT3 RS also use them.
• Porsche Cayenne (955/957) – Cayenne Turbo and some V8 models from 2003-2010.
• Porsche 911 Carrera 4S (996) – Some examples with the Turbo brake option.

They are commonly retrofitted to:

• Porsche 944, 968, 928 – Requires custom brackets and wheels with proper clearance.
• Porsche Boxster / Cayman – With appropriate adapter kits.
• Porsche 911 SC, Carrera (1974-1989) – A popular upgrade for classic 911s.

How to Identify a 19Z Caliper

If you have a loose caliper, check the casting. On the back of the caliper, you should see raised numbers like "19Z". Also look for a Porsche part number (e.g., 955.351.421.00). The caliper will have six pistons: two large and four smaller, arranged in a staggered pattern. The bleed screw location also helps identify left vs. right: the screw should face upward when mounted on the correct side.

Buying Guide: What to Look For

When purchasing Porsche 19Z calipers, consider the following:

New vs. Used

• New calipers come with fresh seals, pistons, and paint. They are available from Porsche dealerships or online parts retailers. Part numbers should match your vehicle.
• Used calipers are cheaper but may need rebuilding. Look for signs of corrosion, leaking seals, or damaged piston bores. Always check the casting numbers to ensure they are genuine 19Z units.

Rebuilding vs. Ready-to-Install

Many enthusiasts buy used calipers and rebuild them with new seals and dust boots. Rebuild kits are available (part numbers vary: 955.352.909.00 for seals). If you want bolt-on convenience, purchase remanufactured calipers from reputable suppliers.

Compatibility with Rotors and Pads

19Z calipers require a minimum of 330mm rotors, but commonly 350mm. The calipers are designed for 28mm thick rotors. Pad shape is typical for Porsche 6-piston calipers, such as Pagid RS29 or OEM pads. Ensure your wheels have enough clearance (typically 18-inch or larger).

Common Questions About 19Z Caliper Part Numbers

Can I use a 996 part number on a 997?

Yes, they are often interchangeable, but the brake line fitting may differ. The 997 uses a banjo bolt, while 996 uses a straight fitting. You'll need the correct brake line adapter.

Are there left and right differences?

Yes, the calipers are side-specific. Left and right part numbers are different because of the bleed screw location and internal fluid routing. Never force a left caliper onto the right side.

What about rear calipers?

19Z calipers are usually front only. Rear calipers on these models are typically 4-piston (like 19Z rears, but smaller). Rear part numbers are not covered here; they follow a different series.

Final Recommendation

Before buying, determine your vehicle model and brake specifications. If you have a 996 Turbo, look for 996.351.421.00 (left) and 996.351.422.00 (right). For a Cayenne, use 955.351.421.00/422.00. Always double-check the part number with your VIN using a Porsche parts catalog or consult a specialist. For upgrades, consider a complete brake kit that includes calipers, rotors, pads, and lines for proper compatibility. Rebuilding used calipers is cost-effective but ensure you have the right rebuild kit and tools. Avoid purchasing from unverified sources without confirming the caliper's condition.

Remember that safety is paramount. Brakes are critical components—if in doubt, seek professional installation. With the correct part numbers and careful installation, 19Z calipers will provide outstanding braking performance for years to come.