Overview
The ZF 4646.109.019 PARKING BRAKE is a critical OEM sub-assembly designed for the WG 250, WG 260, and WG 310 series transmissions. This component engages the internal drum brake mechanism to secure the vehicle when parked, preventing unintended movement on inclines or flat surfaces. As a direct replacement unit, the SKU 4646.109.019 integrates seamlessly with the transmission housing to ensure reliable static holding torque. It is mounted on the output shaft assembly and works in conjunction with the TRANSMISSION HOUSING to maintain structural integrity during high-load applications.
Symptoms of Failure
- Vehicle rolls on slopes: A worn parking brake fails to hold the vehicle stationary, especially on grades, indicating internal lining degradation or spring fatigue.
- Audible grinding or scraping: Metallic noises during engagement suggest worn brake shoes or debris trapped between the drum and the HOUSING.
- Reduced braking force: The lever or actuator requires excessive travel to engage, pointing to stretched cables or seized pivot points within the sub-assembly.
- Oil contamination near the brake area: Leaks from the output shaft seal can saturate the brake lining, causing sudden loss of holding power.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4646.109.019 |
| OEM Reference | ZF 4646.109.019 |
| Material | Cast iron drum with sintered metal lining |
| Weight | 4.2 kg (9.3 lbs) |
| Dimensions (L x W x H) | 210 mm x 180 mm x 95 mm |
| Fastener Torque Spec | 85 Nm (use HEXAGON SCREW and CAP SCREW) |
| Seal Type | Integrated lip seal (replace with housing gasket) |
Compatibility
This parking brake sub-assembly is engineered for ZF WG-series transmissions, specifically the WG 250, WG 260, and WG 310 models. It also fits the WG 180 and WG 200 series when used with the appropriate adapter kit. The part is not compatible with older WG 120 or WG 150 variants without modification to the HOUSING interface. Always verify the output shaft spline count before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101156 | TRANSMISSION HOUSING | Encloses gear train and supports brake assembly |
| 4646301327 | HOUSING | Secondary cover for output shaft area |
| 0636015304 | HEXAGON SCREW | Secures brake bracket to housing |
| 0636101828 | CAP SCREW | Fastens brake drum to output flange |
| 4646301102 | COVER SHEET | Protects internal brake mechanism from debris |
| 4646301285 | COVER SHEET | Alternate cover for WG 310 series |
| 0730365190 | TYPE PLATE | Identification label for transmission model |
| 0631311009 | GROOVED STUD | Alignment pin for brake assembly |
| 0636101193 | CAP SCREW | Mounting bolt for actuator bracket |
| 0636010179 | HEXAGON SCREW | Secures cover sheet to housing |
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