Overview
The ZF 4644.109.480 PARKING BRAKE is a critical safety and holding component engineered specifically for the WG 200 Series transmission family. This OEM genuine part integrates directly into the output section of the transmission housing, engaging a mechanical lock on the driveline to prevent vehicle rollaway when parked. The SKU 4644.109.480 is precision-machined to interface seamlessly with the internal drum and actuation mechanism, ensuring positive engagement under load. When installed alongside the 4644101220 TRANSMISSION HOUSING or the 4644301221 TRANSMISSION HOUSING, this parking brake assembly provides reliable static torque holding for heavy-duty industrial applications.
Symptoms of Failure
When the ZF 4644.109.480 PARKING BRAKE begins to wear, operators will notice distinct failure modes that compromise vehicle safety. Inability to hold the vehicle on a grade is the most common symptom, where the transmission rolls even with the brake fully applied. Audible grinding or metallic scraping during engagement indicates worn friction surfaces or damaged internal components. Intermittent release failure occurs when the brake sticks partially engaged, causing driveline drag and overheating. Oil contamination from the transmission housing can also degrade the brake lining, leading to reduced holding torque and premature failure of the 0634306525 O-RING seals.
Technical Specifications
| Part Number | 4644.109.480 |
| Type | Internal Expanding Drum Parking Brake |
| Material | Ductile Iron Housing with Sintered Metal Friction Lining |
| Weight | 4.8 kg (10.6 lbs) |
| Max Holding Torque | 1,200 Nm (885 ft-lbs) |
| Operating Temperature Range | -40°C to +120°C |
| OEM Reference | ZF 4644.109.480 |
Compatibility
This parking brake is primarily designed for the ZF WG 200 Series transmissions, including the WG200, WG210, and WG220 variants. It is also compatible with the ZF WG180 Series when used with the appropriate 4644303060 COVER PLATE or 4644303061 COVER PLATE adapter. The assembly fits all WG200 models produced after 2005, and can be retrofitted to earlier units by replacing the 0631311009 GROOVED STUD and verifying the 0730365067 TYPE PLATE identification. Always confirm your transmission serial number against the type plate before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101220 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301221 | TRANSMISSION HOUSING | Alternate housing variant for WG200 |
| 0730365067 | TYPE PLATE | Identification tag with serial number |
| 0631311009 | GROOVED STUD | Mounting fastener for brake assembly |
| 4644303060 | COVER PLATE | Seals brake access opening |
| 4644303061 | COVER PLATE | Alternate cover with vent port |
| 0634306525 | O-RING | Hydraulic seal for housing joint |
| 0636305026 | SCREW PLUG | Drain/fill port closure |
| 4644301279 | SCREEN SHEET | Filter mesh for oil return |
| 4644301088 | SEALING CAP | Protects sensor port from debris |
