ZF 4644.109.475 PARKING BRAKE for WG180/WG200 | OEM Genuine Part

Overview

The ZF 4644.109.475 PARKING BRAKE is a critical safety and locking component engineered specifically for the WG180 and WG200 series transmissions. This OEM genuine part integrates directly into the output section of the gearbox, engaging a mechanical lock on the driveline to prevent vehicle roll-away when parked. As a positive-locking mechanism, it disengages hydraulically during normal operation and applies spring force to secure the output shaft. The SKU 4644.109.475 is the direct factory replacement, ensuring precise fitment and load-holding capacity within the TRANSMISSION HOUSING assembly.

Symptoms of Failure

When the ZF 4644.109.475 PARKING BRAKE begins to wear, operators often notice specific operational faults. Parking brake fails to hold on an incline is a primary indicator, where the vehicle creeps despite the brake being engaged. Another common symptom is grinding or clunking noise when engaging the parking brake, suggesting worn internal pawls or a damaged actuator. You may also experience intermittent warning lights or error codes related to the parking brake system on the vehicle’s display. Finally, hydraulic fluid contamination near the output flange can occur if internal seals degrade, leading to a slow leak that compromises holding force.

Technical Specifications

Compatibility

This parking brake is designed for the ZF WG180 and WG200 transmission families. It is a direct fit for the WG180, WG180C, WG200, and WG200C series gearboxes used in heavy-duty trucks, buses, and construction equipment. The part interfaces with the TRANSMISSION HOUSING and the HOUSING sub-assembly. For identification purposes, always cross-reference the TYPE PLATE on your unit. The assembly is secured using the GROOVED STUD to ensure proper alignment and torque retention.

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