Overview
The ZF 4699.109.056 BRAKE is a critical OEM genuine component designed to provide precise stopping power and load-holding capability within ZF heavy-duty transmission assemblies. Positioned at the output shaft or within the clutch pack housing, this brake engages to halt rotational motion during gear shifts or stationary operation, ensuring operator safety and drivetrain longevity. The SKU 4699.109.056 is engineered to withstand high thermal loads and constant friction in construction machinery applications, such as wheel loaders and graders. This part works in concert with the 4699101046: HOUSING and the 4699301109: HOUSING to form a sealed, high-pressure brake assembly that resists contamination and wear.
Symptoms of Failure
- Delayed or incomplete braking response: When the 4699.109.056 brake wears, operators may notice a lag between pedal engagement and actual deceleration, often accompanied by a grinding noise during shifts.
- Transmission fluid leaks near the brake housing: Worn friction surfaces or degraded seals allow hydraulic oil to escape, leaving puddles under the machine and reducing system pressure.
- Gear slippage under load: A failing brake cannot hold the output shaft stationary, causing the transmission to slip out of gear when the machine is under heavy load or on an incline.
- Overheating and burnt odor: Excessive friction from a glazed or warped brake generates high heat, often producing a distinct burnt clutch smell and visible smoke from the transmission vent.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4699.109.056 |
| Type | Brake (Friction Disc / Brake Plate Assembly) |
| Outer Diameter | ~180 mm (estimated) |
| Inner Diameter | ~110 mm (estimated) |
| Thickness | ~8 mm (friction material + core) |
| Material | Sintered bronze friction lining on steel core |
| Weight | ~0.9 kg (2.0 lbs) |
| OEM Reference | ZF 4699.109.056 |
| Operating Pressure | 12–18 bar (hydraulic) |
Compatibility
This brake is primarily used in ZF WG series powershift transmissions commonly found in construction machinery. Compatible models include the WG180, WG200, and WG210 series, as well as certain variants of the Ergopower and Ecomix drivelines. It is also a direct replacement for brake assemblies in older ZF 4WG-180 and 4WG-200 units. Always verify your transmission serial number before ordering. For full assembly integrity, pair this brake with the 4699301017: BEARING COVER and the 4699301085: COVER to ensure proper alignment and sealing.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101046 | HOUSING | Encloses the brake pack and directs hydraulic flow |
| 4699301109 | HOUSING | Secondary housing for output shaft support |
| 4699301017 | BEARING COVER | Seals and protects the brake shaft bearing |
| 4699301085 | COVER | Access cover for brake inspection and service |
| 4699301014 | THREAD PROTECTIVE SHIELD | Protects housing threads during assembly |
| 0634303141 | O-RING | Seals hydraulic fluid between brake and housing |
| 0734307407 | PROTECTION CAP | Covers exposed ports to prevent debris ingress |
| 0634309600 | SHAFT SEAL | Prevents oil leakage along the output shaft |
| 0637885612 | BREATHER | Equalizes internal pressure and vents moisture |
| 0636102023 | CAP SCREW | Fastens brake assembly components securely |
