Overview
The ZF 2093.128.004 SERVICE BRAKE is a critical hydraulic actuation component engineered for heavy-duty braking within ZF powershift transmissions. Positioned inside the transmission housing, this service brake assembly directly engages the output shaft to halt rotational motion under load. As an OEM genuine part, the SKU 2093.128.004 ensures precise fitment and reliable stopping force for construction machinery operating in demanding environments. This brake unit works in concert with the 2093109023: DIFFERENTIAL to manage torque distribution during deceleration.
Symptoms of Failure
- Delayed braking response or spongy pedal feel — Worn internal seals in the 2093.128.004 cause hydraulic pressure loss, leading to inconsistent stopping power.
- Transmission overheating during operation — A dragging service brake generates excessive friction, raising fluid temperatures and accelerating wear on the 0750117075: TAPER ROLLER BEARING.
- Oil leaks near the brake housing — Deteriorated piston seals allow transmission fluid to escape, visible as drips around the bell housing.
- Grinding noise when engaging brakes — Metal-on-metal contact from worn friction plates indicates imminent failure of the service brake assembly.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 2093.128.004 |
| Type | Service Brake (Hydraulic) |
| Material | Cast Iron Housing / Steel Friction Plates |
| Weight | 4.2 kg (9.3 lbs) |
| Dimensions (L x W x H) | 210 mm x 180 mm x 95 mm |
| OEM Reference | ZF 2093.128.004 |
| Operating Pressure | 12–18 bar |
Compatibility
This service brake is designed for ZF WG series transmissions commonly used in wheel loaders, graders, and telehandlers. Compatible models include WG180, WG200, and WG210 series. It also integrates with the 2093209096: DIFFERENTIAL and 2093309073: DIFF.HOUSING assemblies found in ZF 4-speed and 6-speed powershift units. Always verify transmission serial numbers before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093109023 | DIFFERENTIAL | Distributes torque between drive axles |
| 0750117075 | TAPER ROLLER BEARING | Supports rotating shafts under axial load |
| 2093209096 | DIFFERENTIAL | Secondary torque split assembly |
| 2093309073 | DIFF.HOUSING | Encloses differential gears and bearings |
| 0631100223 | SPRING PIN | Secures brake linkage alignment |
| 0730300820 | THRUST WASHER | Reduces axial friction in brake piston |
| 4482360002 | AXLE BEVEL GEAR | Transfers power to wheel hubs |
| 2097309085 | DIFFERENTIAL AXLE | Connects differential to final drive |
| 5838300811 | THRUST WASHER | Prevents gear end-play in brake pack |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Meshes with axle bevel gear for rotation |
Frequently Asked Questions
Q: Can the ZF 2093.128.004 service brake be rebuilt, or must it be replaced entirely?
A: While internal friction plates and seals are serviceable, the OEM unit is designed as a sealed assembly. Replacement with the genuine 2093.128.004 is recommended to avoid hydraulic leaks and ensure consistent braking torque.
Q: What causes premature wear on this service brake in construction machinery?
A: Contaminated transmission fluid (from water or debris) and frequent high-load stops are primary causes. Regular fluid changes and inspection of the 0750117075: TAPER ROLLER BEARING can extend brake life.
Q: Is the 2093.128.004 interchangeable with other ZF brake part numbers?
A: No. This SKU is specific to WG180/WG200 series transmissions. Using non-OEM substitutes may result in improper fitment or reduced braking capacity.
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