Dongfeng GX Clutch master cylinder with oil reservoir assembly 1604005-H02A0

As the core of the clutch hydraulic system, this assembly delivers linear pressure transmission to ensure smooth and precise clutch engagement. It generates a maximum working pressure of 8 - 10 MPa when the clutch pedal is fully depressed, with a pressure build-up rate of ≤0.5 seconds to minimize pedal lag—critical for heavy-duty applications requiring frequent gear shifts (e.g., urban delivery or mountainous terrain driving). The master cylinder’s internal piston (machined from high-grade cast iron) features a precision-machined seal groove housing an HNBR rubber cup, ensuring leak-free operation and consistent pressure transfer. The integrated oil reservoir includes a fluid level sensor port (compatible with Dongfeng GX’s dashboard warning system) that alerts the driver to low brake fluid levels, preventing clutch failure due to insufficient hydraulic pressure

The assembly features a one-piece integrated design combining the master cylinder and oil reservoir, eliminating potential leak points from separate components. The reservoir is constructed from impact-resistant HDPE plastic with a UV-stabilized additive, preventing fluid degradation from sunlight exposure and resisting cracking under temperature fluctuations (-40°C to +80°C). The master cylinder body is made of die-cast aluminum alloy (ADC12) with a trivalent chromium plating (thickness ≥8μm) and a clear passivation layer, achieving 500-hour salt spray resistance (per ASTM B117) to withstand road salt and moisture. Internal fluid passages are honed to a surface finish of Ra ≤0.8μm, minimizing hydraulic fluid turbulence and ensuring consistent pressure flow to the slave cylinder

Engineered to withstand the thermal stress of heavy-duty clutch operation, the assembly incorporates heat-resistant materials and design features. The piston seal (HNBR rubber) maintains flexibility at continuous operating temperatures up to 120°C, preventing hardening or cracking from engine bay heat. The push rod (chrome-plated carbon steel) features a self-lubricating nylon bushing at the pedal connection point, reducing friction and wear during repeated pedal actuation (tested to 1 million cycles without significant degradation). The hydraulic fluid recommended for use (DOT 3 or DOT 4 brake fluid) is compatible with the assembly’s internal materials, ensuring long-term chemical stability and preventing corrosion of internal components. This thermal and wear resistance ensures reliable performance even during extended periods of heavy clutch usage (e.g., long downhill descents requiring frequent gear changes)

This clutch master cylinder assembly meets strict domestic and international standards for automotive hydraulic components. It complies with GB 16897 (China National Standard for Motor Vehicle Brake Hose Assemblies and Components), ISO 4033 (International Standard for Hydraulic Brake Master Cylinders), and Dongfeng’s internal Q/DF 019-2024 standard for clutch hydraulic systems. Each unit undergoes rigorous factory testing, including: a pressure tightness test (withstanding 15 MPa without leakage), a fatigue test (1.5 million cycles of piston operation), a high-temperature performance test (stable operation at 120°C), and a dimensional inspection using coordinate measuring machines. These certifications ensure the assembly’s safety, reliability, and compatibility with global markets, making it suitable for Dongfeng GX trucks operating in diverse regions with varying regulatory requirements