Dual Independent Oil Circuit High-Strength Forged Cast Iron Brake Master

Product Specification

Construction machinery For 123-3426 1233426 Cylinder converts CAT 438C 426C Engine Parts

Specification

Description

This dual-cylinder brake master cylinder for construction machinery is compatible with CAT 438C and 426C models, with part number 123-3426 (1233426). It is a matching hydraulic brake accessory for construction machinery engines. Adopting an integrated cast iron main body and integrated mounting bracket structure, two sets of independent hydraulic cylinders are combined through connecting pipelines, equipped with dust-proof rubber bellows and protective plugs for hydraulic oil ports. Featuring a compact and regular structure, it can be installed directly in alignment with original vehicle positions. It transmits brake pressure in the hydraulic brake circuit of construction machinery to ensure stable oil pressure output of the vehicle brake system, widely applied in replacement and maintenance of brake assemblies for backhoe loaders and other construction equipment.

Advantage

Developed with original-equipment identical structural mould, the mounting holes and oil circuit interfaces are fully consistent with original parts, enabling direct replacement without modification and greatly shortening equipment maintenance time.
The high-strength forged cast iron cylinder body resists high pressure, corrosion and deformation, adapting to harsh construction site working conditions and preventing erosion from grease, muddy water and extreme temperatures.
The thickened wear-resistant dust-proof rubber boot effectively blocks sediment, dust and rainwater from entering the cylinder, avoiding wear and aging of internal piston seals to extend service life.
The dual independent oil circuit design serves as mutual backup. Basic braking capacity can still be maintained if one circuit fails, greatly improving operation safety of construction vehicles.
Each unit undergoes strict factory hydraulic tightness testing to eliminate oil seepage, leakage and pressure relief. No repeated commissioning is required after installation, perfectly matching the hydraulic parameters of the original brake system.

Performance

Excellent high-pressure resistance ensures stable bearing of normal working oil pressure in vehicle brake systems, delivering even pressure transmission and sensitive brake response without delay.
Precisely honed inner cylinder plus high-sealing built-in oil seals prevent pressure drop and oil leakage even under long-term frequent braking, maintaining lasting stable braking performance.
Strong adaptability to extreme temperatures: the rubber components resist hardening and cracking under cold or high-temperature open-air working conditions, and the cylinder avoids seal failure caused by thermal expansion and cold contraction.
Linear hydraulic pressure output ensures smooth and controllable braking force, effectively preventing wheel lock-up from sudden heavy braking or brake failure caused by insufficient pressure.
The integrated mounting bracket features excellent shock and vibration resistance. No loose or displacement occurs during heavy-load bumpy driving, continuously guaranteeing stable installation of the brake hydraulic circuit.

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