TRW Automotive AfterMarket PHB391 Brake Hose

TRW Automotive AfterMarket PHB391 Brake Hose

The TRW PHB391 brake hose is a high‑performance hydraulic line designed to replace or upgrade the braking system of a wide range of vehicles, particularly those from Alfa Romeo. It delivers reliable pressure transmission, durability against heat and vibration, and a seamless fit with existing brake components.

Key Features

• Material Construction: Dual‑layer braided steel reinforcement encased in a high‑temperature silicone rubber sheath. This combination resists abrasion, flex fatigue, and chemical degradation from brake fluid.
• Temperature Resistance: Operates effectively up to 200 °C (392 °F), ensuring consistent performance during heavy braking or racing conditions.
• Pressure Capacity: Rated for pressures up to 3000 psi, providing a safety margin above typical automotive brake system demands.
• Flexible Design: The hose’s flexible core allows it to navigate tight engine bay spaces and accommodate suspension movement without kinking.
• Pre‑sealed End Fittings: Each end features a sealed, threaded connector that matches standard brake line fittings (e.g., M10x1 for Alfa Romeo models). This eliminates the need for additional adapters or sealants during installation.

Compatibility and Applications

The PHB391 is engineered to fit a variety of Alfa Romeo vehicles, including:

• Alfa Romeo 147
• Alfa Romeo 156 (Berline & Sportwagon)
• Other models with similar brake line specifications and M10x1 fittings.

Because the hose uses standard industrial fittings, it can also be adapted to other European cars that employ comparable brake line dimensions. The dual‑layer construction ensures a universal fit across many aftermarket brake systems.

Installation Guide

1. Preparation: Disconnect the vehicle’s battery and drain the existing brake fluid to avoid contamination.
2. Removal of Old Hose: Unscrew the old hose from both the caliper or wheel cylinder and the master cylinder. Carefully remove any debris or old sealant.
3. Installation of PHB391: Align the pre‑sealed threaded ends with the corresponding fittings. Tighten securely, ensuring no cross‑threading occurs.
4. Re‑filling: Refill the brake system with fresh, compatible brake fluid (DOT4 or DOT5.1 as specified by the vehicle manufacturer).
5. Bleeding: Bleed the brakes to remove air bubbles and confirm proper hydraulic pressure.
6. Inspection: Verify that the hose is free of kinks, leaks, and that all fittings are tight. Test drive at low speed to ensure braking performance is normal.

Benefits Over Standard Hoses

• Enhanced Durability: The braided steel reinforcement resists wear from brake fluid chemicals and high temperatures, extending the hose’s service life beyond typical rubber hoses.
• Improved Safety: With a higher pressure rating and robust construction, the PHB391 reduces the risk of hose failure under extreme braking conditions.
• Consistent Performance: The silicone sheath maintains flexibility while preventing fluid leakage, ensuring that brake response remains steady over time.
• Easy Replacement: Pre‑sealed fittings and standard thread sizes mean the hose can be swapped without specialized tools or additional components.

Maintenance Tips

Although the PHB391 is designed for longevity, regular checks are recommended:

• Inspect for visible cracks, bulges, or discoloration every 12 months.
• Check thread integrity at both ends; replace if any signs of wear appear.
• Ensure brake fluid remains within the manufacturer’s recommended type and level to avoid contamination.

Conclusion

The TRW Automotive AfterMarket PHB391 Brake Hose offers a reliable, high‑quality solution for vehicles requiring robust hydraulic lines. Its advanced material composition, temperature tolerance, and pressure capacity make it an ideal choice for both everyday driving and performance applications. By integrating this hose into your braking system, you gain confidence in safety, durability, and consistent brake feel.