Overview
The ZF 4642.109.006 PARKING BRAKE is a critical safety and holding component engineered specifically for the WG 150 Series transmission. This OEM genuine part integrates directly into the output section of the gearbox, where it mechanically locks the drivetrain when engaged, preventing vehicle rollaway on inclines or during stationary operation. The SKU 4642.109.006 is designed to interface seamlessly with the 4642101114: TRANSMISSION HOUSING and the 4642301213: TRANSMISSION HOUSING, ensuring precise alignment and secure mounting within the assembly. As a genuine ZF part, it guarantees factory-specified clamping force and durability for heavy-duty industrial applications.
Symptoms of Failure
When the 4642.109.006 parking brake wears out, operators often notice specific performance degradation. Common failure symptoms include:
- Inability to hold the vehicle on a grade: The transmission may creep forward or backward even when the parking brake is fully engaged, indicating worn friction surfaces or broken internal springs.
- Grinding or scraping noises during engagement: A metallic sound when applying the brake suggests damaged brake pads or debris contamination within the drum assembly.
- Oil seepage around the brake actuator: Hydraulic fluid leaks from the parking brake housing point to seal failure, often accompanied by a drop in system pressure.
- Intermittent brake release: The brake may unexpectedly disengage during operation, posing a serious safety risk and requiring immediate replacement of the unit.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4642.109.006 |
| OEM Reference | ZF 4642.109.006 |
| Material | High-strength cast iron housing with sintered metal friction linings |
| Weight | 4.2 kg (9.26 lbs) |
| Dimensions (L x W x H) | 210 mm x 180 mm x 95 mm |
| Bolt Torque Specification | 65 Nm (48 ft-lbs) |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This parking brake is primarily designed for the ZF WG 150 Series transmission, but it also fits select models in the WG 180 and WG 200 families due to shared output shaft dimensions. It is compatible with transmissions that utilize a mechanical drum-style brake system. For proper installation, ensure the 0730365125: TYPE PLATE is verified against your transmission serial number, and use the 0631311009: GROOVED STUD for secure fastening. Always cross-reference your existing part before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101114 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4642301213 | TRANSMISSION HOUSING | Secondary housing for auxiliary components |
| 0730365125 | TYPE PLATE | Identification tag for transmission model |
| 0631311009 | GROOVED STUD | Alignment fastener for brake assembly |
| 4642301168 | SCREEN SHEET | Filter mesh for hydraulic fluid |
| 4642301169 | SCREEN SHEET | Secondary fluid filtration element |
| 0636100621 | HEXAGON SCREW | Mounting bolt for housing covers |
| 4642301186 | SCREEN SHEET | High-flow filter for oil return |
| 4644106300 | SHIFT SYSTEM | Gear selection mechanism |
| 4644306500 | COVER PLATE | Sealing plate for brake access port |
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