Brake Pump Vacuum Line. Porsche 997.1 Carrera 2 / 2S / 4 / 4S 2005-08  ❭  99711005503

The Porsche Brake Pump Vacuum Line 99711005503 is a genuine replacement vacuum pipe for the brake-assistance system on Porsche 997.1 models.

Fits:

• Porsche 997 MK1 Carrera 2 3.6L 2005-08
• Porsche 997 MK1 Carrera 2S 3.8L 2005-08
• Porsche 997 MK1 Carrera 4 3.6L 2005-08
• Porsche 997 MK1 Carrera 4S 3.8L 2005-08  

Designed to follow the original Porsche routing and connection arrangement, this replacement is suitable for renewing an original line that has become cracked, brittle, damaged or unable to maintain a reliable vacuum seal.

What This Product Does:

The hydraulic braking system provides the actual braking force, while the brake booster uses vacuum to reduce the effort required at the brake pedal.

The vacuum pump generates the required vacuum, and this line transfers it to the brake-assistance system.

Its main functions include:

• Carrying vacuum from the vacuum/tandem pump
• Supplying the brake booster system with vacuum
• Maintaining a sealed vacuum circuit
• Supporting consistent power-assisted braking
• Reducing brake pedal effort
• Maintaining the correct factory vacuum-line routing
• Providing secure connections between the vacuum pump and brake-assistance system

The line does not create braking pressure itself. Instead, it enables the brake booster to assist the hydraulic braking system.

Symptoms Of Wear Or Failure:
Age, engine-bay heat and vibration can cause the original vacuum line and its connections to deteriorate. Cracking has been documented particularly around the transition between the metal pipe and flexible hose section.

Common symptoms may include:

• Brake pedal becoming unusually hard
• Increased effort required when braking
• Reduced brake servo assistance
• Inconsistent power-assisted braking
• Pedal becoming harder after repeated brake applications
• Hissing or vacuum-leak noises
• Visible cracks in the vacuum hose
• Splitting near hose-to-pipe connections
• Brittle or hardened hose material
• Loose or damaged vacuum connections
• Damaged retaining clips
• Line becoming detached or incorrectly supported
• Poor vacuum retention within the brake-assistance circuit

A hard brake pedal can also be caused by a faulty brake booster, vacuum pump, check valve or another vacuum-system component, so correct diagnosis is recommended.

Why Replacement Matters:
The brake booster relies on an adequate vacuum supply to provide normal power assistance.

If the vacuum line cracks or leaks, the available vacuum can fall and brake assistance may be reduced. The hydraulic braking system may still operate, but considerably more pedal force may be required to achieve the same braking effect.

This can make the vehicle more difficult to brake comfortably and predictably, particularly during repeated braking or situations requiring rapid deceleration.

Replacing a damaged vacuum line helps restore:

• Correct vacuum supply to the brake-assistance system
• Normal brake pedal assistance
• Consistent pedal effort
• Reliable brake servo operation
• Proper sealing of the vacuum circuit
• Correct factory hose routing and mounting

Because this component supports the braking assistance system, visible cracking, damaged connections or vacuum leakage should be addressed promptly.