ZF 4657.109.427 PARKING BRAKE for WG190/WG210 | OEM Genuine Part

Overview

The ZF 4657.109.427 PARKING BRAKE is a critical mechanical locking assembly designed specifically for the WG190 and WG210 series transmissions. This OEM genuine part engages directly within the output shaft housing to secure the vehicle when stationary, preventing unintended rollaway on inclines or during loading operations. As an integral component of the parking pawl mechanism, it interfaces with the transmission housing to lock the driveline. The SKU 4657.109.427 is manufactured to ZF’s exacting tolerances, ensuring reliable engagement and disengagement under heavy-duty industrial conditions. When paired with the TRANSMISSION HOUSING, this parking brake provides the necessary structural integrity for long service intervals.

Symptoms of Failure

• Parking brake fails to hold on incline: If the vehicle rolls forward or backward when the parking brake is engaged on a grade, the 4657.109.427 pawl or its spring mechanism may be worn or broken.
• Grinding or clicking noise during engagement: A metallic grinding sound when applying the parking brake indicates damaged teeth on the parking gear or misalignment within the HOUS.FRONT SECT.
• Intermittent engagement or release failure: When the parking brake lever feels loose or the brake does not fully disengage, the internal actuator or pivot pin may be seized or fatigued.
• Transmission fluid contamination near the rear seal: A worn parking brake assembly can allow debris into the HOUSING REAR PART, leading to oil leaks and reduced hydraulic pressure.

Technical Specifications

Compatibility

This parking brake is engineered for ZF WG series transmissions, specifically the WG190 and WG210 models. It is also compatible with the WG180 and WG200 series when used with the appropriate HOUSING REAR SECTION. The 4657.109.427 replaces earlier variants in the WG family and is backward-compatible with most WG180 and WG200 units produced after 2005. Always verify the housing configuration before installation.

Related Components

Frequently Asked Questions

Q: Can the 4657.109.427 parking brake be installed without removing the transmission?
A: In most WG190 and WG210 applications, the parking brake can be accessed by removing the rear housing section. However, for full replacement of the pawl and spring, the HOUSING REAR SECTION must be detached, which may require transmission removal in tight chassis layouts.

Q: How do I know if my parking brake is the correct version for a WG200 transmission?
A: Verify the housing casting number on the HOUSING REAR PART. The 4657.109.427 is compatible with WG200 units that have a 12-tooth parking gear. If your unit has a 14-tooth gear, you will need a different parking brake assembly.

Q: What torque specification should be used for the cap screws when reinstalling the housing?
A: For the CAP SCREW (0636100803) on the rear housing, use 85 Nm (63 ft-lbs). The CAP SCREW (0636100801) for the front section requires 65 Nm (48 ft-lbs). Always apply thread locker to prevent loosening.