Overview
The ZF 4699.109.125 BRAKE PARTS | OEM Genuine Part is a critical internal component designed for the hydraulic brake system within ZF heavy-duty construction machinery transmissions. This OEM-sourced assembly ensures precise braking force application and release, directly influencing machine safety and operational control. The SKU 4699.109.125 sits within the transmission’s clutch pack and brake piston housing, where it modulates hydraulic pressure to engage or disengage the parking and service brakes. For optimal assembly integrity, this part is frequently installed alongside the 4699101071: HOUSING and the 4699301145: HOUSING, which provide the structural enclosure for the brake piston and friction discs.
Symptoms of Failure
When the ZF 4699.109.125 brake parts wear out, operators typically encounter three to four distinct failure modes. First, delayed brake engagement or a soft pedal feel occurs as internal seals degrade, allowing hydraulic fluid to bypass. Second, intermittent gear slipping during directional shifts signals that the brake cannot hold the planetary gear set stationary. Third, external oil leaks around the transmission housing near the brake piston area are common, often traced back to worn O-rings or scored piston surfaces. Fourth, abnormal grinding noises during braking indicate metal-on-metal contact from worn friction material. These symptoms are frequently addressed by replacing the brake parts in conjunction with the 4699309085: HOUSING COVER and the 0636101411: CAP SCREW to ensure a sealed, secure assembly.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | 4699.109.125 |
| Component Type | Brake Piston / Friction Disc Set |
| Material | Hardened Steel / Sintered Bronze Friction Lining |
| Outer Diameter (approx.) | 180 mm |
| Inner Diameter (approx.) | 120 mm |
| Thickness (stack height) | 28 mm |
| Weight | 1.45 kg |
| OEM Reference | ZF 4699.109.125 |
| Seal Type | Nitrile Rubber (NBR) O-Ring |
Compatibility
This genuine ZF brake part is engineered for use in the following ZF transmission models commonly found in wheel loaders, dozers, and excavators: ZF WG180, ZF WG200, and ZF WG210 series. It also applies to the ZF 4WG-180 and ZF 4WG-200 powershift transmissions. Always verify the transmission serial number and brake piston bore diameter before ordering. For complete rebuilds, consider pairing this part with the 0631302212: CYLINDRICAL PIN for alignment and the 0634801038: SEALING RING for leak prevention.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101071 | HOUSING | Encloses brake piston and clutch pack |
| 4699301145 | HOUSING | Provides mounting surface for brake assembly |
| 4699309085 | HOUSING COVER | Seals the brake chamber from contaminants |
| 0636101411 | CAP SCREW | Secures housing cover to transmission case |
| 0631302212 | CYLINDRICAL PIN | Aligns housing components during assembly |
| 0634801038 | SEALING RING | Prevents hydraulic fluid leakage at piston |
| 0501319149 | SCREW PLUG | Closes oil passages in brake circuit |
| 0637885613 | BREATHER | Equalizes pressure inside transmission housing |
| 0730365801 | TYPE PLATE | Identifies transmission model and serial number |
| 0636302013 | SCREW PLUG | Seals drain or fill ports in brake system |
