ZF 4657.109.404 PARKING BRAKE for WG190 | OEM Genuine Part

Overview

The ZF 4657.109.404 PARKING BRAKE is a critical safety and holding component engineered specifically for the WG 190 Series transmission. This OEM genuine part integrates directly into the rear output section of the transmission assembly, where it mechanically locks the driveline when engaged. Designed to withstand high static torque loads, the parking brake ensures that heavy-duty vehicles remain stationary on inclines and during loading operations. The SKU 4657.109.404 is a direct replacement unit, manufactured to ZF’s original tolerances for reliable long-term service. It works in concert with the HOUSING REAR PART to form a sealed, robust braking chamber.

Symptoms of Failure

• Vehicle Creep on Inclines: When the parking brake fails to hold, the vehicle may slowly roll forward or backward on a slope, indicating worn friction surfaces or broken return springs within the 4657.109.404 unit.
• Grinding or Scraping Noises: A metallic grinding sound during parking brake engagement or disengagement suggests that the brake lining has worn down to the metal backing plate or that the mechanism has become misaligned with the HOUS.FRONT SECT.
• Intermittent Brake Release: If the parking brake lever or actuator feels spongy or the brake releases unexpectedly, internal components like the CYLINDRICAL PIN may be sheared or corroded, preventing full lock-up.
• Oil Contamination Near Brake Area: Leakage of transmission fluid around the parking brake housing often points to a failed seal within the assembly, which can degrade brake performance and require replacement of the 4657.109.404 unit.

Technical Specifications

Compatibility

This parking brake is primarily designed for the ZF WG 190 Series transmission, which is widely used in municipal trucks, refuse vehicles, and construction equipment. Based on its mechanical interface and spline dimensions, the 4657.109.404 is also compatible with the WG 180 and WG 200 series transmissions that share the same rear output architecture. It is not recommended for use in the earlier WG 160 series without verifying the housing interface. The unit directly mounts inside the HOUSING REAR PART and interfaces with the HOUS.FRONT SECT for alignment.

Related Components

Frequently Asked Questions

Q: How do I know if the 4657.109.404 parking brake is the correct part for my WG190 transmission?
A: Verify the part number stamped on your existing brake unit. This SKU is specific to the WG190 series and will have a 210 mm outer diameter. Cross-check the spline count (typically 24 splines) against your output shaft.

Q: Can I replace just the friction lining instead of the entire 4657.109.404 assembly?
A: ZF does not supply the friction lining separately for this part. The entire parking brake unit must be replaced as a single assembly to ensure proper clamping force and safety compliance.

Q: What tools are required to install this parking brake?
A: You will need a torque wrench capable of 80 Nm, a spline socket for the output shaft nut, and a puller tool to remove the old brake drum from the HOUSING REAR PART.