Introduction

The 3518020-Q377 Relay Valve is a core pneumatic control component for the air brake system of FAW heavy-duty trucks. Designed to optimize brake air circuit efficiency, this valve rapidly supplies and exhausts compressed air for the brake chambers, effectively shortening brake response time and releasing delay. It ensures sensitive, stable and consistent braking performance during heavy-load driving, downhill cruising and emergency braking. Built with high-precision internal valve core structure and premium durable sealing accessories, it resists air leakage, pressure impact and harsh environmental erosion. This genuine-spec relay valve perfectly solves common brake faults including weak braking force, slow response and brake dragging, serving as a reliable OEM replacement part for daily maintenance and brake system overhaul of FAW heavy trucks.

Key Features

✅️100% OEM Exact Fit 

Manufactured strictly according to FAW original factory standards with standard part number 3518020-Q377. All mounting dimensions, air port positions, thread specifications and working pressure parameters fully match original vehicle requirements. No modification or drilling needed for direct installation, achieving perfect compatibility with FAW heavy-duty truck air brake systems.

✅️Premium Durable Construction 

Adopts high-strength anti-corrosion valve housing and high-precision integrated valve core, paired with high-temperature and wear-resistant rubber sealing rings. The overall structure features strong pressure resistance and structural stability, capable of long-term stable operation under frequent high-pressure air circuit cycles without failure.

✅️Fast Brake Response & Sensitive Control 

Optimized internal flow channel design greatly improves air intake and exhaust efficiency. It effectively reduces brake lag time, delivers instantaneous and balanced braking force, and realizes quick brake release, avoiding brake dragging, tire overheating and driving inertia problems to improve overall braking safety.

✅️Zero Air Leakage & Stable Air Circuit 

Adopts precision fitting sealing technology with uniform compression and tight fit. It thoroughly prevents compressed air leakage, reduces unnecessary air pump load and air consumption, and maintains stable air pressure in the brake system all the time, adapting to long-distance and high-intensity truck operation.

✅️Strong Environmental Adaptability & Long Service Life 

Professional anti-aging, oil-proof and dust-proof treatment enables the valve to adapt to complex chassis environments such as high temperature, low temperature, humidity and dust erosion. It effectively avoids seal aging, valve core jamming and performance degradation, greatly extending service life.

✅️Cost-Effective Aftermarket Solution 

Factory direct supply with 100% air tightness and pressure resistance testing, providing OEM-level quality at competitive wholesale prices. Widely applicable to FAW series heavy-duty trucks, it is a hot-selling replacement part for repair shops, fleet companies and global spare parts merchants in Middle East, Africa and Central Asia markets.

Detail

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Contact with clear photo of engine nameplate or chassis number:

Linda Zhang

Whatsapp:+86 176 6066 8410

EMAIL:sales16@chinatruck.cc