Overview
The ZF 4657.109.425 PARKING BRAKE is a critical safety and holding component engineered specifically for the WG 210 Series transmission. This OEM genuine part engages the internal drum brake mechanism to lock the output shaft, preventing vehicle roll-away when parked or during stationary operation. Positioned within the rear housing assembly of the transmission, the parking brake interfaces directly with the HOUSING REAR SECTION to ensure secure engagement. The SKU 4657.109.425 is manufactured to ZF’s exacting tolerances, guaranteeing reliable static holding torque and long service life in heavy-duty industrial applications.
Symptoms of Failure
- Incomplete vehicle hold on inclines: When the parking brake fails to keep the vehicle stationary on a grade, the internal friction lining or actuator mechanism within part 4657.109.425 may be worn or contaminated.
- Grinding or scraping noises during engagement: Audible metallic sounds when applying the parking brake indicate that the brake drum or shoes have suffered excessive wear or debris ingress.
- Reduced braking force requiring higher lever effort: If the operator must pull the parking brake lever harder than normal, the internal spring tension or linkage of the 4657.109.425 unit has likely degraded.
- Oil seepage near the rear transmission housing: A leaking seal around the parking brake assembly can allow transmission fluid to contaminate the brake surfaces, leading to slippage and eventual failure.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number (SKU) | 4657.109.425 |
| OEM Reference | ZF 4657.109.425 |
| Material | High-grade steel drum with sintered friction lining |
| Weight | 4.2 kg (9.3 lbs) |
| Overall Diameter | 210 mm |
| Mounting Bolt Pattern | 6 x M10 on 180 mm PCD |
| Operating Temperature Range | -40°C to +120°C |
| Compatible Fasteners | CAP SCREW (0636100801) and CAP SCREW (0636100803) |
Compatibility
This parking brake assembly is designed for the ZF WG 210 Series transmissions. It is also compatible with the WG 180, WG 200, and WG 250 model families that share the same rear housing architecture. The part integrates with the TRANSMISSION HOUSING, HOUS.FRONT SECT, and HOUSING REAR PART to form the complete rear driveline assembly. Always verify your transmission serial number against ZF application guides before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101080 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201167 | HOUS.FRONT SECT | Front section of transmission housing |
| 4657201171 | HOUSING REAR PART | Rear housing segment for output components |
| 4657298103 | HOUSING REAR SECTION | Complete rear housing assembly |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing mating |
| 0636100801 | CAP SCREW | Fastener for brake assembly mounting |
| 4656301148 | FIXING PLATE | Retains brake components in position |
| 4657301034 | SCREEN SHEET | Filter screen for oil flow control |
| 4657301035 | SCREEN SHEET | Secondary filter screen for debris protection |
| 0636100803 | CAP SCREW | Secondary fastener for housing closure |
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