Overview
The ZF 4699.109.103 BRAKE is an OEM genuine friction component engineered for the internal braking systems of heavy-duty construction machinery transmissions. This part, identified by SKU 4699.109.103, functions as a stationary brake assembly that engages to halt output shaft rotation during parking or emergency stops. It is typically mounted within the transmission housing, directly interfacing with the OUTPUT shaft assembly. When hydraulic pressure is applied, the brake pack compresses to lock the driveline, providing reliable holding torque for wheel loaders, dozers, and graders operating under extreme loads.
Symptoms of Failure
- Transmission brake slipping under load: If the machine rolls on an incline despite the parking brake being engaged, the friction material on the 4699.109.103 may be worn beyond tolerance.
- Delayed brake engagement or soft pedal feel: A loss of hydraulic pressure or internal seal leakage within the brake housing can cause a spongy response, often traced to a failing HOUSING seal.
- Metallic grinding noises during brake application: Worn steel plates or debris contamination produce a harsh grinding sound, indicating imminent failure of the brake pack.
- Oil leaks near the transmission output flange: Degraded sealing rings around the brake assembly allow transmission fluid to escape, reducing system pressure and brake effectiveness.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4699.109.103 |
| Type | Brake Assembly (Friction Disc & Steel Plate Pack) |
| Outer Diameter | 210 mm (8.27 in) |
| Inner Diameter | 140 mm (5.51 in) |
| Thickness (Stacked) | 38 mm (1.50 in) |
| Material | Sintered Bronze Friction Lining / Hardened Steel |
| Weight | 2.4 kg (5.3 lbs) |
| OEM Reference | ZF 4699.109.103 |
| Operating Pressure | 12–18 bar (174–261 psi) |
Compatibility
This brake component is designed for ZF heavy-duty powershift transmissions commonly used in construction machinery. It is a direct fit for the WG180, WG200, and WG210 series. The 4699.109.103 also integrates with the GP25 gear pump assembly and the INPUT shaft module. For proper installation, ensure the mating HOUSING is free of scoring and the OUTPUT shaft splines are intact.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699025066 | GP25 | Gear pump supplying hydraulic pressure to the brake circuit |
| 4699101071 | HOUSING | Encloses the brake pack and aligns the output shaft |
| 4699102106 | INPUT | Input shaft assembly delivering torque from the engine |
| 4699103104 | OUTPUT | Output shaft transferring power to the driveline |
| 4699109043 | BRAKE PARTS | Service kit containing friction discs and seals |
| 4699301145 | HOUSING | Alternate housing variant for WG200 transmissions |
| 4699309085 | HOUSING COVER | Seals the brake housing and retains the piston |
| 0636101411 | CAP SCREW | M10 fastener securing the housing cover |
| 0631302212 | CYLINDRICAL PIN | Alignment pin for precise housing assembly |
| 0634801038 | SEALING RING | O-ring preventing fluid leakage at the brake piston |
