NISSAN 47471-VC300 Brake Booster Vacuum Hose

The genuine NISSAN (part number: 47471-VC300) brake booster vacuum hose (HOSE-MASTERVAC) is a critical safety component responsible for transferring vacuum between the engine intake manifold (or vacuum pump) and the brake booster (mastervac). This vacuum supplies the necessary assist to significantly reduce the physical effort required to depress the brake pedal.

Technical Features and Properties

• Premium Material Quality: Manufactured from high-grade, heat- and oil-resistant reinforced elastomer (EPDM) rubber engineered to withstand harsh engine bay conditions.
• Vacuum Collapse Resistance: Built with internal reinforcement to prevent hose collapse under high suction loads.
• Genuine (OEM) Fit: Produced in accordance with strict Nissan factory specifications, ensuring a secure, leak-free connection and hassle-free installation.
• Environmental Resistance: High resistance to ozone degradation, fuel vapors, and thermal aging.

Role and Importance of the Brake Booster Vacuum Hose

The proper function of the power brake system depends directly on the airtight integrity of the vacuum circuit. The brake booster vacuum hose ensures a steady and stable vacuum supply to the booster drum. If the hose deteriorates or fails, brake power assistance is drastically compromised, presenting a direct risk to driving safety.

Typical Signs of Failure

• Hard Brake Pedal: A stiff, hard-to-depress brake pedal requiring significantly greater foot effort, resulting in reduced braking performance.
• Hissing Noise: An audible hissing sound coming from the engine bay or pedal assembly while the engine is running, signaling a vacuum leak.
• Rough Engine Idle: Unmetered air drawn in through a cracked or damaged hose disrupts the engine air-fuel mixture, leading to stumbling or erratic idling.
• Check Engine Light (MIL): Vacuum loss may be detected by the engine control module (ECU), triggering diagnostic trouble codes.