Overview
The ZF 4642.109.404 PARKING BRAKE is a critical safety and holding component engineered specifically for the WG 150 Series transmission. This OEM genuine part engages a mechanical locking mechanism within the output shaft assembly to prevent vehicle roll-away when parked or during stationary operation. As an integral element of the driveline brake system, the SKU 4642.109.404 interfaces directly with the 4642101047: TRANSMISSION HOUSING and the 4642301207: TRANSMISSION HOUSING to ensure secure mounting and precise actuation. This part is designed to withstand high static loads and repeated engagement cycles, making it indispensable for heavy-duty industrial applications where safety compliance is non-negotiable.
Symptoms of Failure
- Inability to hold the vehicle on an incline: A worn parking brake often fails to lock the output shaft, causing the vehicle to creep or roll even when the lever is fully engaged.
- Audible grinding or clicking noises during engagement: Deteriorated internal pawls or springs produce metallic sounds, indicating the mechanism is no longer seating correctly.
- Excessive free play in the parking brake lever: As the brake assembly wears, the actuation stroke increases, requiring more travel before any holding force is applied.
- Oil seepage around the brake housing: Failed seals within the parking brake unit allow transmission fluid to escape, often leaving visible residue on the 0730365067: TYPE PLATE area.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4642.109.404 |
| OEM Reference | ZF 4642.109.404 |
| Material | Hardened alloy steel with corrosion-resistant coating |
| Weight | Approx. 2.8 kg (6.2 lbs) |
| Overall Length | 185 mm |
| Mounting Bolt Pattern | 4-hole, 90 mm spacing |
| Operating Temperature Range | -40°C to +120°C |
| Max Holding Torque | 1,200 Nm |
Compatibility
This parking brake assembly is primarily designed for the ZF WG 150 Series, but its mounting interface and torque capacity also make it suitable for the WG 180 and WG 200 transmissions in certain configurations. It is commonly found in mobile cranes, concrete pumps, and heavy-duty off-road vehicles. For proper installation, ensure the 0631311009: GROOVED STUD is correctly torqued to the housing to prevent misalignment. Always verify the output shaft spline count and housing casting number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101047 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4642301207 | TRANSMISSION HOUSING | Secondary housing for clutch pack assembly |
| 0730365067 | TYPE PLATE | Identification plate with transmission specs |
| 0631311009 | GROOVED STUD | Alignment pin for housing mating surfaces |
| 4642301168 | SCREEN SHEET | Oil filter mesh for hydraulic circuit |
| 4642301169 | SCREEN SHEET | Fine filtration screen for valve body |
| 0636100621 | HEXAGON SCREW | Fastener for cover plate attachment |
| 4642301186 | SCREEN SHEET | Coarse debris screen for sump area |
| 4644106300 | SHIFT SYSTEM | Hydraulic shift actuator assembly |
| 4644306500 | COVER PLATE | Sealing plate for access port |
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