Overview
The ZF 4642.109.444 PARKING BRAKE is a critical safety and holding component engineered specifically for the WG 150 Series transmission. This OEM genuine part engages a mechanical locking mechanism within the output shaft assembly, ensuring the vehicle remains stationary when parked or during maintenance operations. As a direct replacement for the original factory unit, the SKU 4642.109.444 interfaces seamlessly with the transmission housing to provide reliable static braking torque. Without this assembly, the drivetrain lacks the necessary restraint to prevent unintended roll-away, making it indispensable for construction, agricultural, and industrial machinery applications.
Symptoms of Failure
- Vehicle rolls on inclines when parking brake is engaged: A worn 4642.109.444 fails to hold the output shaft, causing the machine to creep or roll even with the lever fully applied.
- Grinding or scraping noise during engagement: Deteriorated friction surfaces or broken internal springs produce audible metal-on-metal sounds when the parking brake is activated.
- Oil leakage near the rear transmission flange: Seal degradation within the parking brake assembly allows transmission fluid to escape, often visible as drips around the output area.
- Inconsistent brake release or sticking: Corrosion or debris buildup prevents the mechanism from disengaging fully, leading to drag and reduced fuel efficiency.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4642.109.444 |
| OEM Reference | ZF 4642.109.444 |
| Material | High-strength steel alloy with sintered friction lining |
| Weight | Approx. 2.8 kg (6.2 lbs) |
| Outer Diameter | 180 mm |
| Inner Diameter | 95 mm |
| Thickness | 28 mm |
| Torque Capacity | 450 Nm (static) |
Compatibility
This parking brake assembly is primarily designed for the ZF WG 150 Series transmission. Based on its mechanical interface and spline configuration, it is also compatible with the WG 180 and WG 200 models, as well as select variants of the WG 120 series. Always verify the output shaft diameter and bolt pattern against your specific transmission serial number before installation. The 4642.109.444 mounts directly to the rear of the 4642101117: TRANSMISSION HOUSING and is secured using the 0636100621: HEXAGON SCREW kit. For proper identification, the 0730365125: TYPE PLATE should be cross-referenced to confirm model fitment.
During installation, the 4642301217: TRANSMISSION HOUSING provides the structural mounting point, while the 0631311009: GROOVED STUD ensures precise alignment of the brake assembly. Additional sealing is achieved with the 0630361029: SEALING CAP and the 0634303340: O-RING to prevent fluid ingress. For debris protection, the 4642301168: SCREEN SHEET and 4642301169: SCREEN SHEET filter contaminants from the brake chamber.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101117 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4642301217 | TRANSMISSION HOUSING | Alternate housing variant for WG150 |
| 0730365125 | TYPE PLATE | Identification plate for transmission model |
| 0631311009 | GROOVED STUD | Alignment pin for brake assembly |
| 4642301168 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4642301169 | SCREEN SHEET | Coarse mesh filter for debris |
| 0636100621 | HEXAGON SCREW | Fastener for housing attachment |
| 0630361029 | SEALING CAP | Protects threaded openings |
| 4642306254 | ADAPTER | Interface for auxiliary components |
| 0634303340 | O-RING | Hydraulic seal for pressure integrity |
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