Overview
The ZF 4644.109.016 PARKING BRAKE is a critical safety and holding component engineered specifically for the WG 150 Series transmission. This OEM genuine part engages a mechanical locking mechanism within the output shaft assembly, preventing unintended vehicle movement when parked or during maintenance. The SKU 4644.109.016 interfaces directly with the transmission housing and shift system to provide reliable static braking torque. As a wear-sensitive element, it must be replaced with exact OEM specifications to maintain the integrity of the entire drivetrain. When installing this unit, technicians often pair it with the 4642101047: TRANSMISSION HOUSING to ensure proper alignment and sealing.
Symptoms of Failure
- Intermittent parking brake release failure: The lever or actuator becomes stiff or unresponsive, often accompanied by a grinding noise when attempting to disengage the brake.
- Oil seepage near the output flange: Worn seals within the 4644.109.016 assembly allow transmission fluid to leak past the brake drum, leaving visible drips under the vehicle.
- Vehicle roll on inclines: The brake fails to hold the transmission in park on slopes as low as 5 degrees, indicating worn friction linings or stretched springs.
- Metallic rattling during operation: Loose components inside the parking brake mechanism create a distinct chatter when the transmission is in neutral or drive.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.109.016 |
| OEM Reference | ZF 4644.109.016 |
| Material | Hardened steel drum with sintered bronze friction lining |
| Weight | 3.2 kg (7.05 lbs) |
| Outer Diameter | 180 mm |
| Mounting Bolt Pattern | 6 x M10 on 140 mm PCD |
| Max Static Torque | 1,200 Nm |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This parking brake is primarily designed for the ZF WG 150 Series, but it also fits select variants of the WG 180 and WG 200 transmissions when used with the correct 4642301207: TRANSMISSION HOUSING. It is compatible with all WG 150 models manufactured after 2010, including the WG150-5 and WG150-6. For retrofit applications on older units, verify that the 0730365067: TYPE PLATE matches your transmission serial number. The brake assembly also requires the 0631311009: GROOVED STUD for correct actuator linkage alignment. Always consult your transmission’s parts manual before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101047 | TRANSMISSION HOUSING | Main structural casing for gear and brake assembly |
| 4642301207 | TRANSMISSION HOUSING | Alternate housing variant for WG150/WG180 |
| 0730365067 | TYPE PLATE | Identification plate with transmission specs |
| 0631311009 | GROOVED STUD | Alignment pin for brake actuator linkage |
| 4642301168 | SCREEN SHEET | Oil filter screen for hydraulic circuit |
| 4642301169 | SCREEN SHEET | Fine mesh filter for valve body protection |
| 0636100621 | HEXAGON SCREW | Mounting bolt for brake assembly |
| 4642301186 | SCREEN SHEET | Secondary oil strainer for cooler lines |
| 4644106300 | SHIFT SYSTEM | Mechanical shift linkage and detent assembly |
| 4644306500 | COVER PLATE | Access cover for parking brake adjustment |
Authorized ZF Distributor
We are a certified supplier of genuine ZF components.
