ZF 4657.109.428 PARKING BRAKE for WG190/WG210 | OEM Genuine Part

Overview

The ZF 4657.109.428 PARKING BRAKE is a critical safety and locking component designed for the WG190 and WG210 series transmissions. This OEM genuine part engages directly within the transmission housing to secure the output shaft, preventing vehicle roll-away when parked. As an integral element of the parking pawl assembly, the 4657.109.428 interfaces with the shift mechanism to provide reliable static holding torque. For complete assembly integrity, this parking brake works in conjunction with the 4657101088: TRANSMISSION HOUSING, which encloses the entire gear train and hydraulic system.

Symptoms of Failure

• Transmission fails to hold on incline: If the vehicle rolls forward or backward on a slope after shifting to Park, the parking brake mechanism or its engagement teeth may be worn or broken.
• Grinding noise when engaging Park: A harsh metallic grinding sound during shift engagement indicates damaged pawl teeth or a misaligned actuator, often caused by fatigue in the 4657.109.428 assembly.
• Intermittent park lock release: The transmission may unexpectedly disengage from Park while the engine is running, a dangerous condition linked to a failing parking brake spring or pivot pin.
• Oil seepage near the parking brake area: Worn seals or a cracked housing section around the parking brake can lead to fluid leaks, often visible near the rear of the transmission pan.

Technical Specifications

Compatibility

This genuine ZF parking brake is engineered for the WG190 and WG210 transmission series. It is also compatible with the WG180, WG200, and select WG150 variants that share the same parking pawl architecture. The part directly mounts inside the 4657201183: HOUS.FRONT SECT and the 4657201184: HOUSING REAR PART. For full rear enclosure, the 4657298111: HOUSING REAR SECTION provides the necessary sealing and structural support. Always verify your transmission model number before ordering.

Related Components

Frequently Asked Questions

Q: Can I replace the parking brake without removing the transmission?
A: In most WG190/WG210 installations, the parking brake is accessible after removing the rear housing section. However, for full access to the 4657.109.428 pawl and actuator, the transmission may need to be lowered or partially dismounted. Consult your service manual for specific vehicle clearance.

Q: How do I know if my ZF transmission uses this exact part?
A: Verify your transmission model tag (located on the side of the main housing). If the tag reads WG190 or WG210, this part is a direct fit. For WG180 or WG200 units, measure the parking brake cavity depth—this part requires a 40 mm deep pocket.

Q: What torque should I use for the cap screws securing this parking brake?
A: Use 45 Nm (33 ft-lbs) for the main mounting bolts. Over-torquing can distort the housing and cause binding. Always use new 0636100803: CAP SCREW fasteners during reassembly.