Overview
The ZF 4657.109.401 PARKING BRAKE is a critical safety and holding component engineered specifically for the WG 190 Series transmission. This OEM genuine part engages a mechanical lock on the output shaft, ensuring the vehicle remains stationary when parked, even on steep gradients. Located within the rear section of the transmission housing, it interfaces directly with the driveline to prevent unintended rollaway. The SKU 4657.109.401 is a direct replacement for worn units, restoring full parking brake functionality and compliance with safety standards. When servicing this assembly, it is common to inspect the TRANSMISSION HOUSING for cracks or wear, as the parking brake mounts directly to this structure.
Symptoms of Failure
- Vehicle rolls on inclines after parking: A worn parking brake mechanism fails to hold the output shaft, causing the vehicle to drift even when the lever is fully engaged.
- Grinding or scraping noise during engagement: Damaged internal components or misalignment produce metallic sounds when the brake is applied or released.
- Parking brake lever feels loose or has excessive travel: Internal wear or broken springs reduce resistance, requiring the lever to be pulled further than normal before any holding force is felt.
- Oil seepage near the rear transmission output: Failed seals within the parking brake assembly allow transmission fluid to leak past the output shaft, often visible as drips under the vehicle.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number / SKU | 4657.109.401 |
| OEM Reference | ZF 4657.109.401 |
| Material | Hardened steel with corrosion-resistant coating |
| Weight | Approx. 2.8 kg (6.2 lbs) |
| Dimensions (L x W x H) | 180 mm x 120 mm x 90 mm |
| Mounting Torque | 45 Nm (33 ft-lbs) |
Compatibility
This parking brake is primarily designed for the WG 190 Series transmission, but it also fits select models in the WG180 and WG200 families due to shared output shaft dimensions and housing interfaces. Always verify the part number against your transmission’s serial plate. During installation, the HOUS.FRONT SECT and the HOUSING REAR PART must be aligned correctly to ensure the brake mechanism seats properly. Additionally, the CYLINDRICAL PIN is used to secure the brake actuator linkage during reassembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101033 | TRANSMISSION HOUSING | Main structural casing that encloses the gear train and parking brake assembly. |
| 4657201027 | HOUS.FRONT SECT | Front section of the housing that supports the input shaft and clutch packs. |
| 4657201012 | HOUSING REAR PART | Rear housing segment that contains the output shaft and parking brake mounting points. |
| 0631306792 | CYLINDRICAL PIN | Precision pin used for aligning and securing the brake actuator mechanism. |
| 0636100801 | CAP SCREW | Fastener for securing the parking brake bracket to the housing. |
| 4656301148 | FIXING PLATE | Retaining plate that prevents axial movement of the brake components. |
| 4657301032 | SCREEN SHEET | Fine mesh filter that protects the brake area from debris in the oil flow. |
| 4657301033 | SCREEN SHEET | Secondary filter screen for enhanced contamination control near the brake. |
| 0636100803 | CAP SCREW | Alternate length cap screw for specific housing configurations. |
| 4681301040 | OIL FEED.HOUSG. | Oil feed housing that directs lubrication to the parking brake and output bearings. |
Frequently Asked Questions
Q: How do I know if the 4657.109.401 parking brake is failing?
A: The most common signs include the vehicle rolling on a slope after parking, unusual grinding noises when engaging the brake, or a loose lever that requires excessive travel before holding.
Q: Can this parking brake be installed without removing the transmission?
A: In most cases, the parking brake can be serviced by accessing the rear housing section. However, you must first remove the HOUSING REAR PART to expose the brake assembly. Full transmission removal is only necessary if the TRANSMISSION HOUSING is damaged.
Q: What other parts should I replace when installing a new parking brake?
A: It is recommended to replace the CYLINDRICAL PIN and all CAP SCREWS (0636100801 and 0636100803) as they can stretch over time. Also inspect the OIL FEED.HOUSG. for blockages to ensure proper lubrication.
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