Overview
The ZF 4642.109.410 PARKING BRAKE is a critical safety and locking component engineered specifically for the WG 150 Series transmission. This OEM genuine part engages a mechanical lock on the output shaft to prevent vehicle rollaway when parked, functioning as a spring-applied, pressure-released brake within the rear housing assembly. The SKU 4642.109.410 interfaces directly with the 4642101109: TRANSMISSION HOUSING and the 4642301205: TRANSMISSION HOUSING to ensure correct alignment and sealing. Without this brake, the transmission cannot secure the driveline under load, making it indispensable for industrial vehicles operating on inclines or in stop-and-go cycles.
Symptoms of Failure
When the ZF 4642.109.410 parking brake wears out, operators typically notice these specific failure modes:
- Vehicle creep on slopes: The brake fails to hold the output shaft stationary, causing the vehicle to roll even when the parking brake is engaged.
- Grinding or scraping noise during engagement: Worn friction surfaces or broken return springs produce audible metal-on-metal sounds when activating the brake.
- Intermittent brake release: The brake may unexpectedly disengage while parked due to internal seal leakage or actuator fatigue.
- Hydraulic fluid contamination near the brake housing: Failed O-rings allow transmission oil to bypass the brake piston, leading to external seepage.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4642.109.410 |
| Type | Spring-Applied, Hydraulic-Release Parking Brake |
| Material | Hardened Steel Housing with Sintered Bronze Friction Lining |
| Weight | 4.2 kg (9.3 lbs) |
| Outer Diameter | 180 mm |
| Bolt Pattern | 6 x M10 on 150 mm PCD |
| OEM Reference | ZF 4642.109.410 |
| Max Holding Torque | 2,500 Nm |
Compatibility
This parking brake is primarily designed for the WG 150 Series transmission, but it also fits select models in the WG180 and WG200 families due to shared output shaft dimensions. The brake assembly mounts directly to the 0730365125: TYPE PLATE which identifies the transmission variant, and is secured using the 0631311009: GROOVED STUD for precise torque retention. Always verify the housing casting number before installation to ensure compatibility with your specific unit.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4642301205 | TRANSMISSION HOUSING | Rear housing section supporting output shaft |
| 0730365125 | TYPE PLATE | Identification plate for transmission model |
| 0631311009 | GROOVED STUD | Alignment and retention stud for brake assembly |
| 4642301168 | SCREEN SHEET | Fine mesh filter for hydraulic circuit |
| 4642301169 | SCREEN SHEET | Coarse mesh pre-filter for oil return |
| 0636100621 | HEXAGON SCREW | Fastener for housing and cover plates |
| 4642301186 | SCREEN SHEET | Secondary filter screen for lubrication circuit |
| 4644106085 | SHIFT SYSTEM | Hydraulic valve body for gear selection |
| 4642306050 | COVER PLATE | Access cover for brake adjustment port |
