Overview
The ZF 4657.109.423 PARKING BRAKE is a critical safety and holding component designed exclusively for the WG 210 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 housing assembly, the parking brake mechanism interfaces directly with the HOUSING REAR PART and the HOUS.FRONT SECT to provide reliable static braking force. The SKU 4657.109.423 is manufactured to ZF’s original tolerances, guaranteeing a precise fit and long service life in demanding industrial applications.
Symptoms of Failure
- Vehicle rolls on inclines when parking brake is engaged: A worn parking brake mechanism loses its clamping force, causing the vehicle to creep or roll on slopes. This is a common long-tail search query for “ZF WG210 parking brake not holding.”
- Grinding or scraping noise from transmission when parking brake is applied: Deteriorated brake pads or a damaged actuation lever produce metallic sounds during engagement, indicating the need for immediate replacement of part 4657.109.423.
- Parking brake lever feels loose or has excessive travel: Internal wear in the brake assembly reduces mechanical resistance, making the lever feel spongy or requiring multiple pulls to engage. This symptom often accompanies issues with the CYLINDRICAL PIN that secures the linkage.
- Oil seepage around the parking brake housing: A compromised seal within the brake unit allows transmission fluid to leak past, leaving visible drips under the vehicle and reducing hydraulic pressure.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4657.109.423 |
| OEM Reference | ZF 4657.109.423 |
| Material | High-strength steel with corrosion-resistant coating |
| Weight | 2.8 kg (6.2 lbs) |
| Overall Dimensions | 210 mm x 140 mm x 95 mm |
| Brake Type | Spring-applied, hydraulically released drum brake |
| Operating Temperature Range | -20°C to +120°C |
| Mounting Torque | 45 Nm (33 ft-lbs) |
Compatibility
This parking brake assembly is engineered for the ZF WG 210 Series transmission. It is also compatible with the following ZF transmission models that share the same rear housing architecture: WG180, WG200, and WG211. The part fits directly into the TRANSMISSION HOUSING and mates with the rear section of the gearbox. Always verify your transmission serial number against the WG210 series to confirm fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101039 | TRANSMISSION HOUSING | Main structural casing that encloses all internal gears and shafts |
| 4657201028 | HOUS.FRONT SECT | Front section of the transmission housing, supports input shaft bearings |
| 4657201013 | HOUSING REAR PART | Rear housing section that contains the parking brake and output shaft |
| 0631306792 | CYLINDRICAL PIN | Precision pin used for aligning and securing housing sections |
| 0636100801 | CAP SCREW | High-tensile fastener for bolting housing components together |
| 4656301148 | FIXING PLATE | Retaining plate that locks the parking brake assembly in position |
| 4657301034 | SCREEN SHEET | Fine mesh filter protecting hydraulic passages from debris |
| 4657301035 | SCREEN SHEET | Secondary filter screen for oil return line |
| 0636100803 | CAP SCREW | Fastener for securing the screen sheet and fixing plate |
| 4681301040 | OIL FEED.HOUSG. | Housing component that directs lubrication oil to the brake assembly |
