Porsche 987.2 2.9 Brake Hose Part Number: Complete Guide

If you own a Porsche 987.2 (2009–2012 Cayman or Boxster) with the 2.9-liter flat-six engine, you may eventually need to replace the brake hoses. Rubber hoses degrade over time, leading to a spongy pedal and reduced braking performance. This guide provides the correct OEM part numbers, aftermarket alternatives, and practical advice to help you choose and install new brake hoses.

OEM Brake Hose Part Number for Porsche 987.2 2.9

For the 987.2 2.9, Porsche uses specific part numbers for the front and rear brake hoses. The OEM front left and right hoses are identical, as are the rear hoses.

• Front brake hose: 987-355-029-11
• Rear brake hose: 987-355-029-12

These numbers apply to all 987.2 models with the 2.9L engine, regardless of whether it's a Cayman or Boxster. Always verify fitment with your VIN, as rare options like ceramic brakes may use different hoses. The hoses come with banjo fittings and copper washers pre-installed.

Where to Find OEM Brake Hoses

OEM hoses are available from Porsche dealerships or authorized online retailers. Prices typically range from $40 to $60 per hose. Dealer parts departments can confirm the part number using your VIN. Avoid generic listings that don't specify the exact 987-355-029-11/12 numbers. Genuine Porsche hoses are made by Continental or ATE and meet original specifications.

Aftermarket Brake Hose Options

Many owners upgrade to stainless steel braided brake lines for improved pedal feel and durability. These lines use a PTFE inner liner with a stainless steel braid and a clear or colored outer coating. Popular aftermarket brands for the 987.2 include:

• StopTech: Offers a direct-fit kit (part number 83.502.2400 for front, 83.502.2401 for rear) that replaces all four hoses.
• Goodridge: Their G-Line kit (part number 18989) fits the 987.2 with 2.9L engine.
• Techna-Fit: Provides a DOT-compliant kit (part number TF987-2L) specifically for the 2.9L models.

Aftermarket kits usually include all four hoses, banjo bolts, copper washers, and mounting brackets. They are often TÜV or DOT approved, but check local regulations before installation. Prices range from $100 to $200 for a full set.

Choosing Between OEM and Aftermarket

The choice depends on your driving needs and budget.

OEM Advantages

• Exact fit – no modifications needed.
• Durable rubber construction that lasts 6–8 years.
• Lower cost per hose.
• Maintains factory pedal feel.

Aftermarket Advantages

• Stiffer pedal feel under heavy braking.
• Longer lifespan – stainless steel doesn't swell like rubber.
• More resistant to abrasion and heat.
• Often less expensive for a full set compared to buying four OEM hoses.

Trade-offs

• Aftermarket lines can be stiffer, which some drivers find too firm for daily driving.
• Some aftermarket kits require repositioning of brackets or adding zip ties.
• Not all aftermarket brands are DOT approved – verify before use on public roads.

Installation Considerations

Replacing brake hoses is a moderately difficult DIY job. You will need basic hand tools, a flare nut wrench, brake fluid, and a bleeding kit. Follow these steps:

1. Jack up the car and remove the wheels.
2. Clean the fittings to prevent dirt entry.
3. Disconnect the old hose at the caliper and chassis hard line.
4. Install the new hose, ensuring the bracket aligns correctly.
5. Tighten banjo bolts to 35 Nm (26 lb-ft) and hard line nut to 16 Nm (12 lb-ft).
6. Bleed the brakes thoroughly – use a pressure bleeder for best results.
7. Test pedal feel and check for leaks.

If you are not experienced with brake work, have a professional handle the installation. Improperly bled brakes can cause safety issues.

Final Recommendation

For a daily-driven 987.2 2.9 that sees occasional spirited driving, OEM brake hoses (part numbers 987-355-029-11 and 987-355-029-12) are a reliable, hassle-free choice. They are easy to source, fit perfectly, and maintain the original braking characteristics.

If you track your car or want the best possible pedal feedback, upgrade to a stainless steel braided kit from StopTech or Goodridge. The slightly firmer pedal gives more confidence during hard braking, and the longer lifespan offsets the higher upfront cost.

Whichever option you choose, replace all four hoses at once and use fresh brake fluid to ensure balanced braking. Always reuse the copper washers or install new ones – never reuse old washers. With the correct part numbers and proper installation, your 987.2 2.9 will stop reliably for years to come.