ZF 4642.109.022 PARKING BRAKE for WG150 | OEM Genuine Part

Overview

The ZF 4642.109.022 PARKING BRAKE is a critical mechanical locking assembly designed specifically for the WG 150 Series transmission. This OEM genuine part engages a spring-applied, hydraulically-released mechanism that secures the output shaft when the vehicle is stationary, preventing unintended roll-away on inclines or during loading operations. Positioned within the rear housing of the transmission, the parking brake interfaces directly with the driveline to provide a positive mechanical lock. The SKU 4642.109.022 is engineered to ZF’s exacting tolerances, ensuring reliable engagement and disengagement under heavy-duty industrial conditions. For proper installation, this component works in conjunction with the 4642101109: TRANSMISSION HOUSING and the 4642301205: TRANSMISSION HOUSING, which provide the structural mounting points for the brake assembly.

Symptoms of Failure

• Vehicle Creep on Inclines: When the parking brake fails to hold the transmission output shaft, the vehicle may slowly roll forward or backward on slopes, indicating worn friction discs or weakened springs.
• Hydraulic Fluid Leaks Near Brake Housing: Seal degradation in the 4642.109.022 unit can cause transmission fluid to seep from the parking brake actuator area, often visible as drips under the bell housing.
• Delayed or Incomplete Brake Release: If the brake drags after disengagement, operators may notice increased resistance during acceleration or unusual heat buildup in the driveline, pointing to internal piston sticking.
• Audible Grinding or Clunking: Worn splines or damaged internal components produce metallic noises during engagement or disengagement, signaling imminent failure of the parking brake assembly.

Technical Specifications

Compatibility

While the 4642.109.022 is primarily designed for the WG 150 Series, it is also compatible with several other ZF transmission models that share the same parking brake mounting pattern. These include the WG 180, WG 200, and WG 210 series, particularly in off-highway and industrial applications. The brake assembly can be retrofitted to earlier WG models with minor modifications, but always verify the housing interface using the 0730365125: TYPE PLATE to confirm the exact transmission variant. Additionally, the 0631311009: GROOVED STUD is often replaced concurrently to ensure proper alignment of the brake housing.

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