ZF 2095.128.003 SERVICE BRAKE | OEM Genuine Part

Overview

The ZF 2095.128.003 SERVICE BRAKE is a critical hydraulic actuation component engineered for the internal braking system of heavy-duty ZF powershift transmissions. Positioned within the transmission housing, this OEM genuine part directly controls the clamping force on the rotating drum assembly to decelerate output shafts during loading cycles. The SKU 2095.128.003 is a factory-sealed service brake unit, ensuring precise fluid displacement and consistent friction engagement under extreme torque loads. This component works in concert with the 2095109019 DIFFERENTIAL to manage wheel speed differentials during braking events.

Symptoms of Failure

• Intermittent brake drag or “grabbing” during low-speed maneuvering: Worn internal seals in the 2095.128.003 cause uneven hydraulic pressure, leading to unpredictable engagement when operating on uneven terrain.
• Transmission fluid contamination with metallic particles: Friction material degradation from the service brake generates fine debris, often visible during routine oil sampling, indicating imminent failure of the brake pack.
• Delayed stopping response or extended roll-out distance: A failing service brake cannot maintain clamping force, causing the machine to coast longer than expected after pedal release, particularly noticeable on inclines.
• Audible squealing or grinding from the transmission bell housing: Metal-on-metal contact occurs when the brake lining wears below the minimum thickness, requiring immediate replacement of the 2095.128.003 to prevent scoring of the 2095309059 DIFF.HOUSING.

Technical Specifications

Compatibility

This service brake is designed for integration into ZF’s WG series powershift transmissions commonly found in construction machinery. It is a direct fit for the WG180, WG200, and WG250 models, where it mounts to the differential carrier housing. The 2095.128.003 also interfaces with the 2095209037 DIFFERENTIAL assembly in WG180 units, and requires proper alignment with the 0750117075 TAPER ROLLER BEARING for correct axial clearance. It is not compatible with the older WG120 series without adapter plates.

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