ZF 4657.109.403 PARKING BRAKE for WG190/WG210 | OEM Genuine Part

Overview

The ZF 4657.109.403 PARKING BRAKE is a critical safety and holding component engineered specifically for the WG190 and WG210 transmission series. This OEM genuine part engages a mechanical locking mechanism within the output section of the gearbox, ensuring the vehicle remains stationary when parked, even on steep gradients. As a direct replacement for the original factory assembly, the SKU 4657.109.403 guarantees precise fitment and reliable clamping force. This parking brake assembly integrates seamlessly with the TRANSMISSION HOUSING and the HOUS.FRONT SECT to form the core structural envelope of the transmission.

Symptoms of Failure

When the ZF 4657.109.403 parking brake begins to wear, operators will notice distinct operational issues. Look for these specific failure symptoms to diagnose the problem early:

• Vehicle roll on inclines: The most dangerous symptom is the vehicle creeping or rolling forward after the parking brake is fully engaged, indicating worn friction surfaces or a broken pawl.
• Grinding or clunking noise during engagement: A harsh metallic sound when applying the parking brake suggests damaged internal teeth or a misaligned actuator within the assembly.
• Parking brake fails to release completely: If the vehicle drags or the driveline feels locked while attempting to drive, the parking brake mechanism may be stuck due to corrosion or debris.
• Oil seepage near the output flange: A failing seal within the parking brake unit can allow transmission fluid to leak past the HOUSING REAR PART, leading to low fluid levels and potential gear damage.

Technical Specifications

Compatibility

This parking brake is primarily designed for the WG 190 Series and WG 210 Series transmissions. Based on its mechanical design and mounting interface, it is also compatible with the following ZF models: WG180, WG200, and select variants of the WG150 series when used with the appropriate CYLINDRICAL PIN for alignment. Always verify your transmission serial number against the OEM parts catalog to ensure correct fitment.

Related Components

Frequently Asked Questions

Q: Can the ZF 4657.109.403 parking brake be rebuilt, or must it be replaced entirely?
A: This is a sealed OEM assembly. While internal friction discs can sometimes be serviced, the actuator and pawl mechanism are precision-machined as a unit. For safety-critical applications, we recommend full replacement with the genuine 4657.109.403 part.

Q: How do I know if my WG190 transmission uses this specific parking brake part number?
A: Check the transmission data plate located on the side of the TRANSMISSION HOUSING. If the model code includes “WG190” or “WG210” and the serial number falls within the 2005-2015 production range, this part is likely correct. Always cross-reference with your OEM dealer.

Q: What tools are required to replace the 4657.109.403 parking brake?
A: You will need a torque wrench, a set of metric hex sockets (10mm-18mm), a puller for the output flange, and a CYLINDRICAL PIN alignment tool to ensure proper housing alignment during reassembly.