Overview
The ZF 4644.109.209 PARKING BRAKE is a critical safety and holding component designed exclusively 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 service operations. The SKU 4644.109.209 interfaces directly with the transmission housing and shift system to provide reliable static braking torque. Without this assembly, the driveline cannot be secured against unintended movement, making it essential for both operational safety and maintenance procedures in heavy-duty industrial applications.
Symptoms of Failure
- Vehicle roll on inclines when parking brake is engaged: A worn 4644.109.209 unit fails to hold the output shaft, causing the vehicle to creep or roll on slopes, even with the lever fully applied.
- Grinding or scraping noise during engagement: Deteriorated internal components produce metallic sounds when the parking brake is set or released, indicating severe wear or contamination.
- Intermittent brake release under load: The parking brake may unexpectedly disengage during operation, leading to sudden driveline movement and potential transmission damage.
- Oil seepage around the parking brake housing: Failed seals allow transmission fluid to leak past the actuator, often visible as drips near the output flange area.
Technical Specifications
| Part Number | 4644.109.209 |
| OEM Reference | ZF 4644.109.209 |
| Material | High-strength alloy steel with corrosion-resistant coating |
| Weight | 2.8 kg (6.2 lbs) |
| Dimensions (L x W x H) | 185 mm x 95 mm x 75 mm |
| Operating Torque Capacity | 1,200 Nm (885 ft-lbs) |
| Temperature Range | -40°C to +120°C |
Compatibility
This parking brake assembly is primarily engineered for the ZF WG 150 Series transmission. It is also compatible with the WG 180 and WG 200 models when used with the appropriate 4642101109: TRANSMISSION HOUSING or 4642301205: TRANSMISSION HOUSING. For correct identification, always verify the 0730365125: TYPE PLATE on your unit. The part mounts using a 0631311009: GROOVED STUD to ensure precise alignment within the transmission case.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4642301205 | TRANSMISSION HOUSING | Alternative housing for WG series |
| 0730365125 | TYPE PLATE | Identification tag for model verification |
| 0631311009 | GROOVED STUD | Mounting fastener for brake assembly |
| 4642301168 | SCREEN SHEET | Filter element for oil circuit |
| 4642301169 | SCREEN SHEET | Secondary filter screen |
| 0636100621 | HEXAGON SCREW | Fastener for housing attachment |
| 4642301186 | SCREEN SHEET | Fine mesh filter component |
| 4644106231 | SHIFT SYSTEM | Gear selection mechanism |
| 4644306470 | GASKET | Seal between housing and brake |
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