Overview
The ZF 4699.109.040 BRAKE is a critical OEM genuine component engineered for the internal braking systems of heavy-duty construction machinery transmissions. Positioned within the clutch pack assembly, this brake component manages torque interruption and rotational deceleration during gear shifts, ensuring smooth power flow in demanding off-highway applications. The SKU 4699.109.040 is precision-machined to factory tolerances, directly interfacing with the 4699101155 HOUSING and the 4699201018 HOUSING to create a sealed, high-pressure oil circuit. Without this brake, the transmission cannot reliably hold or release rotational loads, leading to operational instability in excavators and wheel loaders.
Symptoms of Failure
- Delayed gear engagement or transmission slipping under load: When the 4699.109.040 brake wears, hydraulic pressure bleeds past the friction surfaces, causing sluggish shifts and power loss during acceleration.
- Internal transmission overheating: A failing brake generates excessive heat due to constant slippage, often triggering thermal warnings or reducing machine cycle times.
- Metallic grinding noise during directional changes: Worn brake plates or degraded friction material produce audible chatter or grinding sounds when shifting from forward to reverse.
- Hydraulic oil contamination with dark particles: As the brake disintegrates, friction material and metal debris circulate through the system, clogging filters and damaging the 0636100132 TORX SCREW fasteners and adjacent valve bodies.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4699.109.040 |
| Material | Sintered bronze friction lining on hardened steel core |
| Outer Diameter | 180 mm (7.09 in) |
| Inner Diameter | 120 mm (4.72 in) |
| Thickness | 4.5 mm (0.177 in) |
| Weight | 0.85 kg (1.87 lbs) |
| Operating Pressure | 12–18 bar (174–261 psi) |
| Temperature Range | -20°C to +120°C (-4°F to 248°F) |
Compatibility
This brake component is designed for ZF’s WG series powershift transmissions commonly used in construction machinery. It is a direct fit for the WG180, WG200, and WG210 models, as well as select variants of the WG150 series. The 4699.109.040 brake also integrates with the 4699309077 HOUSING COVER to complete the clutch pack assembly. Always verify your transmission serial number before ordering to ensure correct spline engagement and friction plate stack height.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101155 | HOUSING | Encloses the brake pack and directs hydraulic flow |
| 4699201018 | HOUSING | Secondary housing supporting the output shaft |
| 4699309077 | HOUSING COVER | Seals the brake chamber and retains the piston |
| 0636100132 | TORX SCREW | Fastens housing covers with high torque retention |
| 0631302072 | CYLINDRICAL PIN | Aligns housing halves during assembly |
| 0634801038 | SEALING RING | Prevents oil leakage between stationary and rotating parts |
| 0636302013 | SCREW PLUG | Seals oil passages for pressure testing |
| 0501319149 | SCREW PLUG | Magnetic plug for debris collection in sump |
| 0637101790 | BREATHER | Equalizes internal pressure and vents moisture |
| 0631302221 | CYLINDRICAL PIN | Locates the brake piston guide |
