Overview
The ZF 4657.109.402 PARKING BRAKE is a critical safety and holding component designed specifically for the WG190 and WG210 series transmissions. This OEM genuine part engages mechanically to lock the output shaft, preventing vehicle roll when parked or during stationary operation. Positioned within the rear section of the transmission housing, this parking brake assembly interfaces directly with the HOUSING REAR PART and the HOUS.FRONT SECT to ensure precise alignment and secure locking force. The SKU 4657.109.402 is manufactured to ZF’s exacting tolerances, guaranteeing reliable engagement and disengagement under heavy industrial loads.
Symptoms of Failure
When the ZF 4657.109.402 PARKING BRAKE begins to wear, operators may notice specific performance issues. Look for these common failure indicators to diagnose problems early:
- Inability to hold vehicle on incline: The parking brake fails to prevent rolling on slopes, indicating worn friction surfaces or broken internal springs.
- Grinding or scraping noise during engagement: Metallic sounds when applying the brake suggest damaged brake shoes or debris lodged in the assembly, often linked to a compromised TRANSMISSION HOUSING seal.
- Oil leakage near the brake actuator: Hydraulic fluid seeping from the parking brake area points to worn seals or a cracked housing, which can be exacerbated by a failing CYLINDRICAL PIN that misaligns components.
- Delayed or incomplete brake release: The brake sticks or drags after disengagement, causing transmission overheating and reduced fuel efficiency.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4657.109.402 |
| OEM Reference | ZF 4657.109.402 |
| Material | High-strength steel alloy with friction lining |
| Weight | 3.2 kg (7.05 lbs) |
| Dimensions (L x W x H) | 180 mm x 120 mm x 95 mm |
| Operating Temperature Range | -40°C to +120°C |
| Max Holding Torque | 2,500 Nm |
Compatibility
This parking brake is engineered for ZF WG-series transmissions, specifically the WG190 and WG210 models. It also fits the WG180 and WG200 series when used with the appropriate HOUS.FRONT SECT adapter. The 4657.109.402 is not compatible with Ecomat or Ecolife series without significant modifications. Always verify your transmission’s rear housing configuration before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101031 | TRANSMISSION HOUSING | Encloses and supports all internal transmission components |
| 4657201027 | HOUS.FRONT SECT | Front section housing that aligns the input shaft and pump |
| 4657201020 | HOUSING REAR PART | Rear housing that contains the parking brake and output shaft |
| 0631306792 | CYLINDRICAL PIN | Alignment pin for precise housing assembly |
| 0636100801 | CAP SCREW | Fastener for securing housing sections |
| 4656301148 | FIXING PLATE | Locks the parking brake assembly in position |
| 4657301032 | SCREEN SHEET | Filter screen for transmission fluid intake |
| 4657301033 | SCREEN SHEET | Secondary filter screen for hydraulic circuit |
| 0636100803 | CAP SCREW | Bolt for mounting the parking brake bracket |
| 4681301040 | OIL FEED.HOUSG. | Oil feed line housing for lubrication of brake components |
Frequently Asked Questions
Q: How do I know if the ZF 4657.109.402 parking brake is failing?
A: Listen for grinding noises during engagement and check for oil leaks near the rear housing. If the vehicle rolls on a 5% grade with the brake applied, the friction lining is likely worn and replacement is needed.
Q: Can I install this parking brake without removing the transmission?
A: In most WG190 and WG210 applications, you can replace the 4657.109.402 by accessing the rear housing after draining the fluid. However, if the HOUSING REAR PART is damaged, full transmission removal may be required.
Q: What torque should I use for the cap screws when reinstalling?
A: Use 45 Nm for the CAP SCREW (0636100801) and 55 Nm for the CAP SCREW (0636100803) to avoid housing distortion.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
Request a Quote →
