Overview
The ZF 4657.109.406 PARKING BRAKE is a critical mechanical locking assembly designed for the WG 210 Series transmission. This OEM genuine part engages directly with the output shaft to secure the vehicle when stationary, preventing unintended rollaway on inclines or flat surfaces. As a dedicated parking brake unit, it integrates seamlessly with the TRANSMISSION HOUSING and the HOUS.FRONT SECT to form a robust drivetrain assembly. The SKU 4657.109.406 is precision-machined to ZF factory tolerances, ensuring reliable engagement and disengagement under heavy-duty cycles.
Symptoms of Failure
- Parking brake fails to hold on grades: When the vehicle rolls backward or forward on a slope after engaging the parking brake, the internal locking mechanism or friction surfaces may be worn.
- Audible grinding or clicking during engagement: A metallic noise when applying the parking brake indicates damaged pawls, springs, or misalignment within the 4657.109.406 unit.
- Oil seepage near the parking brake housing: Worn seals or gaskets around the assembly can cause transmission fluid leaks, often mistaken for main housing leaks.
- Intermittent release or stuck engagement: Difficulty disengaging the parking brake suggests corrosion or debris buildup inside the mechanism, requiring immediate inspection.
Technical Specifications
| Specification | Details |
|---|---|
| Part Number | 4657.109.406 |
| OEM Reference | ZF 4657.109.406 |
| Material | High-strength alloy steel with corrosion-resistant coating |
| Weight | Approx. 2.8 kg (6.2 lbs) |
| Dimensions | 180 mm x 120 mm x 90 mm |
| Compatible Housing | HOUSING REAR PART |
| Mounting Hardware | CYLINDRICAL PIN included |
Compatibility
This parking brake is engineered for the ZF WG 210 Series, but its design also fits select models in the WG180, WG200, and WG250 families when used with the correct HOUS.FRONT SECT. It is commonly found in medium-duty trucks, buses, and industrial equipment where the WG210 transmission is specified. Always verify the housing configuration—the TRANSMISSION HOUSING must match the parking brake flange pattern for proper installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101033 | TRANSMISSION HOUSING | Main structural casing for gear sets and shafts |
| 4657201027 | HOUS.FRONT SECT | Front section housing for input shaft and bearings |
| 4657201012 | HOUSING REAR PART | Rear housing section supporting output components |
| 0631306792 | CYLINDRICAL PIN | Alignment pin for precise housing assembly |
| 0636100801 | CAP SCREW | Fastener for securing housing sections |
| 4656301148 | FIXING PLATE | Retainer plate for parking brake assembly |
| 4657301032 | SCREEN SHEET | Filter screen for transmission fluid intake |
| 4657301033 | SCREEN SHEET | Secondary filter screen for oil circuit |
| 0636100803 | CAP SCREW | Bolt for mounting parking brake components |
| 4681301040 | OIL FEED.HOUSG. | Oil feed housing for lubrication distribution |
Frequently Asked Questions
Q: Can the 4657.109.406 parking brake be installed without removing the transmission?
A: In most WG210 applications, the parking brake is accessible from the rear of the transmission, but partial removal of the HOUSING REAR PART is required. Full transmission removal is not always necessary, but clearance varies by vehicle chassis.
Q: What causes premature wear on this parking brake part?
A: Common causes include frequent engagement under load, contamination from debris in the transmission fluid, or misalignment due to a worn CYLINDRICAL PIN. Regular inspection of the TRANSMISSION HOUSING for cracks is also recommended.
Q: Is the 4657.109.406 compatible with aftermarket control systems?
A: This OEM genuine part is designed for mechanical actuation and does not interface with electronic parking brake systems. It works with standard cable or lever-operated controls found in WG210-equipped vehicles.
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