Overview
The ZF 4657.109.421 PARKING BRAKE is a critical safety and holding component engineered specifically for the WG 210 Series transmission. This OEM genuine part integrates directly into the rear section of the gearbox assembly, where it engages with the output shaft to mechanically lock the driveline when the vehicle is stationary. Designed to withstand high static loads, the parking brake mechanism ensures that heavy-duty industrial vehicles remain secure on inclines and during loading operations. The SKU 4657.109.421 is precision-machined to ZF’s exacting tolerances, guaranteeing a direct bolt-on replacement without modification. When installed alongside the 4657101039: TRANSMISSION HOUSING and the 4657201028: HOUS.FRONT SECT, this parking brake forms an integral part of the driveline’s fail-safe system.
Symptoms of Failure
When the ZF 4657.109.421 parking brake begins to wear, operators may notice specific performance degradation. Common failure indicators include:
- Vehicle creep on slopes: A worn parking brake fails to hold the transmission output shaft stationary, causing the vehicle to roll on inclines even when the brake is fully engaged.
- Audible grinding or scraping: Internal wear of the brake pads or drum produces a metallic noise during engagement or disengagement, often worsening with transmission temperature.
- Reduced holding torque: The brake may require excessive lever or pedal force to engage, or it may slip under moderate load, indicating worn friction surfaces or damaged internal springs.
- Oil contamination in brake area: Leaking seals from the adjacent 4657201013: HOUSING REAR PART can allow transmission fluid to contaminate the brake lining, drastically reducing friction and causing sudden failure.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4657.109.421 |
| OEM Reference | ZF 4657.109.421 |
| Material | High-strength alloy steel with sintered friction lining |
| Weight | 4.2 kg (9.3 lbs) |
| Overall Diameter | 210 mm |
| Mounting Bolt Pattern | 6x M10 on 180 mm PCD |
| Max Static Holding Torque | 4,500 Nm |
| Operating Temperature Range | -20°C to +120°C |
| Seal Type | Integrated O-ring (replacement recommended) |
Compatibility
This genuine ZF parking brake is primarily designed for the WG 210 Series transmission, but its mounting interface and torque capacity also make it suitable for several other ZF off-highway and industrial gearboxes. Compatible models include the WG 180, WG 200, and WG 211 series, as well as select variants of the WG 150 when used with the correct adapter plate. Always verify the spline count and housing depth against your existing assembly. For proper installation, the 0631306792: CYLINDRICAL PIN must be aligned correctly to prevent rotational misalignment of the brake assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101039 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201028 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4657201013 | HOUSING REAR PART | Rear housing supporting output and brake |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for brake assembly |
| 0636100801 | CAP SCREW | Fastener for brake mounting |
| 4656301148 | FIXING PLATE | Retains brake components in position |
| 4657301034 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4657301035 | SCREEN SHEET | Secondary filter screen |
| 0636100803 | CAP SCREW | Bolt for housing attachment |
| 4681301040 | OIL FEED.HOUSG. | Lubrication supply housing |
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