Overview
The ZF 4642.109.014 PARKING BRAKE is a critical mechanical locking mechanism designed specifically for the WG 150 Series transmission. This OEM genuine part engages directly with the output shaft to secure the vehicle in a stationary position when parked, preventing unintended rollaway on inclines or flat surfaces. As an integral component of the transmission’s final drive assembly, the parking brake interfaces with the 4642101108: TRANSMISSION HOUSING and the 4642301208: TRANSMISSION HOUSING to ensure precise alignment and reliable engagement. The SKU 4642.109.014 is engineered to meet ZF’s stringent OEM tolerances, providing consistent braking force and long service life in heavy-duty industrial applications.
Symptoms of Failure
When the ZF 4642.109.014 parking brake wears out, operators may notice several distinct failure indicators. Vehicle rollback on slopes is a primary symptom, where the brake fails to hold the transmission output shaft stationary, especially under load. Grinding or clunking noises during engagement or disengagement often signal worn brake pads or damaged internal springs. Intermittent brake release can occur, where the parking brake unexpectedly disengages while the vehicle is parked, posing a safety risk. Additionally, oil contamination around the brake housing may appear if seals degrade, leading to reduced braking efficiency and potential damage to adjacent components like the 0730365125: TYPE PLATE.
Technical Specifications
| Part Number | 4642.109.014 |
| OEM Reference | ZF WG 150 Series |
| Material | High-strength alloy steel with friction lining |
| Weight | Approx. 2.8 kg (6.2 lbs) |
| Dimensions | 180 mm outer diameter x 45 mm thickness |
| Mounting Type | Flange-mounted with splined interface |
| Operating Temperature | -40°C to +120°C |
Compatibility
This parking brake is primarily designed for the ZF WG 150 transmission series, but it also fits select models in the WG 180 and WG 200 families due to shared output shaft dimensions and spline patterns. The 4642.109.014 is compatible with transmissions that utilize the 0631311009: GROOVED STUD for secure mounting. For exact fitment, always verify the transmission serial number and consult the OEM parts catalog. This part is not recommended for WG 250 or larger series without adapter modifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101108 | TRANSMISSION HOUSING | Encloses and supports internal transmission components |
| 4642301208 | TRANSMISSION HOUSING | Secondary housing for gear train alignment |
| 0730365125 | TYPE PLATE | Identification plate with transmission specs |
| 0631311009 | GROOVED STUD | Fastener for brake assembly mounting |
| 4642301168 | SCREEN SHEET | Oil filtration mesh for hydraulic circuit |
| 4642301169 | SCREEN SHEET | Secondary oil filtration element |
| 0636100621 | HEXAGON SCREW | Bolt for securing housing covers |
| 0630361029 | SEALING CAP | Protects threaded openings from debris |
| 4642306254 | ADAPTER | Interface for connecting auxiliary systems |
| 0634303340 | O-RING | Seal to prevent fluid leaks at joints |
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