ZF 4642.109.020 PARKING BRAKE for WG150 | OEM Genuine Part

Overview

The ZF 4642.109.020 PARKING BRAKE is a critical safety and holding component engineered specifically for the WG 150 Series transmission. This OEM genuine part engages mechanically to lock the output shaft, preventing vehicle rollaway when parked or during stationary operation. Positioned within the rear housing assembly of the transmission, it interfaces directly with the driveline to provide reliable static braking force. The SKU 4642.109.020 is a direct factory replacement, ensuring exact fitment and original ZF performance standards for industrial and off-highway applications.

Symptoms of Failure

When the ZF 4642.109.020 PARKING BRAKE begins to wear, operators may notice specific performance issues. Transmission creep on inclines occurs when the brake fails to hold the output shaft stationary, causing the vehicle to roll on slopes. Audible grinding or clicking noises from the rear housing indicate worn brake pads or damaged internal linkage. Intermittent parking brake release can happen due to hydraulic or mechanical binding, leading to unexpected drag during operation. Oil contamination in the brake cavity is another sign, often caused by seal degradation, which reduces braking friction and requires immediate inspection.

Technical Specifications

Compatibility

This parking brake is primarily designed for the ZF WG150 transmission, but it also fits select models in the WG180 and WG200 series due to shared housing architecture. It is compatible with transmissions that utilize a rear-mounted drum brake assembly. For proper installation, ensure the 4642101109: TRANSMISSION HOUSING and 4642301205: TRANSMISSION HOUSING are in good condition, as these provide the mounting interface. Additionally, the 0730365125: TYPE PLATE should be verified for correct model identification, and the 0631311009: GROOVED STUD is often replaced simultaneously to ensure secure fastening.

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