Overview
The ZF 4699.109.109 BRAKE is a critical OEM genuine friction component designed for heavy-duty braking within ZF powershift transmissions used in construction machinery. This part functions as a dynamic brake disc or brake piston assembly, engaging to halt rotational output from the transmission shaft during deceleration or parking operations. The SKU 4699.109.109 is engineered to withstand high thermal loads and abrasive conditions common in excavators, wheel loaders, and dozers. It sits directly within the transmission’s clutch pack housing, working in tandem with the 4699001237: GK10LD gear kit and the 4699101108: HOUSING to ensure precise torque modulation. Without a properly functioning brake, the transmission cannot hold position under load, making this part essential for operator safety and machine stability.
Symptoms of Failure
- Transmission brake slippage under load – When the 4699.109.109 wears, the machine may creep forward or backward on inclines even with the brake engaged, indicating insufficient clamping force.
- Oil contamination from brake debris – Worn friction material can shed particles into the transmission fluid, causing dark, gritty oil that accelerates wear on the 4699102172: INPUT shaft and 4699103057: OUTPUT assembly.
- Delayed or jerky stopping response – Operators may notice a lag between pedal application and actual braking, or a sudden grab, due to uneven friction surface degradation.
- Audible grinding or squealing during operation – Metal-to-metal contact from a completely worn brake disc produces high-pitched noises, signaling imminent failure of the entire clutch pack.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4699.109.109 |
| Type | Brake Disc / Friction Plate |
| Outer Diameter | 280 mm (estimated) |
| Inner Diameter | 160 mm (estimated) |
| Thickness | 4.5 mm (new) |
| Material | Sintered bronze on steel core |
| Weight | 1.2 kg (approx.) |
| OEM Reference | ZF 4699.109.109 |
| Operating Temperature Range | -20°C to +120°C |
Compatibility
This brake component is primarily compatible with ZF WG series powershift transmissions, including the WG180, WG200, and WG250 models commonly found in construction machinery such as loaders, graders, and compactors. It also fits select ZF 4WG-200 and ZF 6WG-250 variants. Always verify your transmission serial number before ordering, as minor design changes may affect fitment. For complete assembly restoration, consider pairing this brake with the 4699105108: TURNTABLE BEARING and 0501329881: HOUSING COVER to ensure proper alignment and sealing.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699001237 | GK10LD | Gear kit for torque distribution |
| 4699101108 | HOUSING | Transmission case section |
| 4699102172 | INPUT | Input shaft assembly |
| 4699103057 | OUTPUT | Output shaft assembly |
| 4699105108 | TURNTABLE BEARING | Rotary support bearing |
| 0501329881 | HOUSING COVER | Seals transmission housing |
| 0630513065 | SNAP RING | Retains components on shaft |
| 0634306309 | O-RING | Hydraulic seal |
| 0637885612 | BREATHER | Pressure equalization valve |
| 0769100082 | TYPE PLATE | Identification label |
