Overview
The ZF 4656.109.012 PARKING BRAKE is a critical safety and holding component engineered specifically for the WG 210 Series transmission. This OEM genuine part engages a mechanical locking mechanism within the output shaft assembly, ensuring the vehicle remains stationary when parked or during maintenance procedures. The SKU 4656.109.012 interfaces directly with the transmission housing and rear section to provide reliable static braking torque. As an integral element of the driveline, this parking brake works in concert with the 4657101039: TRANSMISSION HOUSING and the 4657201013: HOUSING REAR PART to maintain structural integrity under load.
Symptoms of Failure
- Vehicle roll-back on inclines: When the parking brake fails to hold the transmission output shaft, the vehicle may drift or roll on grades, indicating worn internal friction surfaces or broken pawl springs.
- Audible grinding or clicking during engagement: A distinct metallic noise when applying the parking brake suggests damaged gear teeth or a misaligned actuator mechanism within the 4656.109.012 assembly.
- Inability to disengage the parking brake: Sticking or seized components can prevent the brake from releasing, often caused by corrosion or debris accumulation around the 0631306792: CYLINDRICAL PIN that links the actuator.
- Transmission fluid seepage near the brake housing: A compromised seal around the parking brake unit can lead to oil leaks, reducing hydraulic pressure and contaminating the brake mechanism.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4656.109.012 |
| Product Type | Parking Brake Assembly |
| Material | High-strength alloy steel with heat-treated friction surfaces |
| Weight | 2.8 kg (6.2 lbs) |
| Dimensions (L x W x H) | 180 mm x 120 mm x 95 mm |
| OEM Reference | ZF 4656.109.012 |
| Mounting Torque | 45 Nm (33 ft-lbs) |
Compatibility
This parking brake is designed primarily for the ZF WG 210 Series transmissions. Based on its mechanical interface and spline configuration, it is also compatible with the WG 180 and WG 200 series models that share the same output shaft architecture. The 4656.109.012 mounts directly to the 4657201028: HOUS.FRONT SECT and requires proper alignment with the rear housing for correct pawl engagement. Always verify your transmission model number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101039 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4657201028 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4657201013 | HOUSING REAR PART | Rear section supporting output shaft |
| 0631306792 | CYLINDRICAL PIN | Alignment pin for brake actuator |
| 0636100801 | CAP SCREW | Fastener for housing assembly |
| 4656301148 | FIXING PLATE | Secures parking brake to housing |
| 4657301034 | SCREEN SHEET | Filter screen for oil flow |
| 4657301035 | SCREEN SHEET | Secondary filter screen |
| 0636100803 | CAP SCREW | Fastener for rear housing |
| 4681301040 | OIL FEED.HOUSG. | Lubrication feed to brake assembly |
