ZF 4657.109.424 PARKING BRAKE for WG190/WG210 | OEM Genuine Part

Overview

This OEM genuine ZF parking brake, SKU 4657.109.424, is a critical safety and holding component engineered specifically for the WG190 and WG210 transmission series. It functions as a spring-applied, hydraulically-released brake that locks the output shaft when the vehicle is stationary, preventing unintended roll-away. Positioned within the rear housing assembly, this part interfaces directly with the HOUSING REAR PART and the HOUSING REAR SECTION to ensure a sealed, high-torque holding capacity. As a genuine ZF component, it guarantees exact fitment and long service life for heavy-duty industrial applications.

Symptoms of Failure

• Vehicle Creep on Inclines: If the parking brake fails to hold the vehicle on a slope, the internal friction discs or piston seals in the 4657.109.424 may be worn or leaking hydraulic pressure.
• Hydraulic Oil Leaks Near the Rear Housing: A common failure mode is seal degradation, causing transmission fluid to seep from the brake piston area, often contaminating the HOUS.FRONT SECT joint.
• Delayed or No Brake Release: When the brake does not disengage after hydraulic pressure is applied, the vehicle may drag or struggle to move, indicating a stuck piston or damaged return springs within the parking brake assembly.
• Unusual Grinding or Clunking Noises: Worn splines or broken friction material can produce metallic sounds when engaging or disengaging the brake, signaling imminent failure of the 4657.109.424 unit.

Technical Specifications

Compatibility

This parking brake is designed 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 correct TRANSMISSION HOUSING adapter. Always verify your transmission serial number before ordering. The brake assembly mounts directly to the rear of the main case and requires the HOUS.FRONT SECT for proper alignment in WG210 variants.

Related Components

Frequently Asked Questions

Q: Can the 4657.109.424 parking brake be rebuilt, or must it be replaced entirely?
A: While some internal friction discs and seals can be serviced, ZF recommends replacing the complete 4657.109.424 assembly to ensure reliable holding torque and avoid hidden wear on the piston bore. Rebuilding often leads to premature failure if the housing is scored.

Q: How do I know if my WG190 transmission uses this specific parking brake part?
A: Check the transmission data plate for the model code. The 4657.109.424 is standard on WG190 and WG210 units built after 2010. For older units, verify the output shaft diameter; this brake fits 50 mm splined shafts.

Q: What tools are required to replace this parking brake?
A: You will need a torque wrench (capable of 45 Nm), a spline socket for the output shaft nut, and a seal driver kit. Always replace the CYLINDRICAL PIN and CAP SCREW during installation to prevent alignment issues.