Overview
The ZF 4644.109.400 PARKING BRAKE is a critical mechanical lock designed specifically for the WG 200 Series transmission. This OEM genuine component engages a positive mechanical stop on the output shaft, ensuring the vehicle remains stationary when parked, even on steep gradients. As part of the rear-mounted brake assembly, it interfaces directly with the transmission housing and shift system to provide reliable holding torque. The SKU 4644.109.400 is the exact replacement part for original factory units, guaranteeing precise fitment and long service life. For complete assembly integrity, this parking brake works in conjunction with the 4644101223: TRANSMISSION HOUSING and the 4644301225: TRANSMISSION HOUSING, which provide the structural mounting points.
Symptoms of Failure
- Vehicle rollback on inclines: If the parking brake fails to hold the transmission output shaft, the vehicle may creep or roll backward when parked on a slope. This is a clear sign of worn brake pads or a seized actuation mechanism within the 4644.109.400 unit.
- Grinding or clicking noise during engagement: A metallic grinding sound when applying the parking brake indicates internal wear or debris contamination. This often accompanies a failing 0730365125: TYPE PLATE, which can misalign the brake assembly.
- Intermittent brake release: The parking brake may engage but fail to disengage fully, causing drag and overheating. This symptom is frequently linked to a damaged 4644301298: COVER PLATE that allows dirt ingress into the brake chamber.
- Oil seepage near the brake housing: Leaks around the parking brake area suggest seal failure. The O-ring (part 0634306525: O-RING) and sealing cap (4644301088: SEALING CAP) are common wear items that should be inspected alongside the brake unit.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.109.400 |
| OEM Reference | ZF 4644.109.400 |
| Material | Hardened steel with corrosion-resistant coating |
| Weight | 2.8 kg (6.2 lbs) |
| Overall Length | 185 mm |
| Mounting Bolt Pattern | 4-hole, 90 mm spacing |
| Max Holding Torque | 1,200 Nm |
| Operating Temperature Range | -40°C to +120°C |
| Compatible Fluid | ZF TE-ML 03 or 05 |
Compatibility
This parking brake is engineered for the ZF WG 200 Series transmission family, including models WG180, WG200, and WG210. It is also a direct fit for certain off-highway and construction equipment variants using the WG200 housing. For proper installation, ensure the transmission housing is intact—check the 4644101223: TRANSMISSION HOUSING and 4644301225: TRANSMISSION HOUSING for cracks or warping. The brake assembly also requires a functional 4644106319: SHIFT SYSTEM or 4644159300: SHIFT SYSTEM to actuate correctly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101223 | TRANSMISSION HOUSING | Main structural casing for the transmission assembly |
| 4644301225 | TRANSMISSION HOUSING | Secondary housing section for rear brake mounting |
| 0730365125 | TYPE PLATE | Identification plate with transmission serial number |
| 4644301298 | COVER PLATE | Protective cover for the parking brake access port |
| 0634306525 | O-RING | Seal between brake housing and cover plate |
| 0636305026 | SCREW PLUG | Threaded plug for fluid drain or inspection port |
| 4644301279 | SCREEN SHEET | Filter screen for transmission fluid intake |
| 4644301088 | SEALING CAP | Cap to seal unused hydraulic ports |
| 4644106319 | SHIFT SYSTEM | Electro-hydraulic shift control module |
| 4644159300 | SHIFT SYSTEM | Alternate shift system variant for WG200 |
