Overview
The ZF 2093.128.018 SERVICE BRAKE is a critical hydraulic braking component engineered for heavy-duty construction machinery transmissions. This OEM genuine part functions as the primary stopping mechanism within the final drive assembly, applying friction directly to the rotating drum to halt wheel motion. Positioned between the axle housing and the differential carrier, the service brake works in concert with the 2093109024 DIFFERENTIAL to manage torque distribution during braking events. The SKU 2093.128.018 ensures precise fitment and original equipment performance, reducing the risk of premature wear in high-stress construction environments.
Symptoms of Failure
- Spongy or unresponsive brake pedal – When the service brake internal seals degrade, hydraulic pressure drops, causing a soft pedal feel and delayed stopping. This is often the first sign of internal leakage.
- Oil leaks near the wheel hub – Worn piston seals or a cracked housing allow transmission fluid to escape, leaving visible puddles under the axle. Search for “ZF brake oil leak construction machinery” to identify this issue early.
- Grinding noise during braking – Friction material wear or metal-on-metal contact produces a distinct grinding sound, indicating the brake pads or discs have reached end-of-life.
- Reduced braking force under load – The machine struggles to stop when carrying heavy loads, a symptom of fading brake performance caused by glazed friction surfaces or hydraulic bypass.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 2093.128.018 |
| Material | Cast iron housing with sintered friction lining |
| Weight | 4.2 kg (9.3 lbs) |
| Outer Diameter | 180 mm |
| Inner Diameter | 95 mm |
| OEM Reference | ZF 2093.128.018 |
| Operating Pressure | 12–16 bar |
Compatibility
This service brake is designed for ZF WG series transmissions commonly used in wheel loaders, graders, and compactors. It directly fits the following models: WG180, WG200, and WG250 series. It also integrates with the 0750117075 TAPER ROLLER BEARING for smooth rotation and the 2093209095 DIFFERENTIAL for load distribution. The brake housing mounts directly to the 2093309071 DIFF.HOUSING to ensure proper alignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093109024 | DIFFERENTIAL | Distributes torque between wheels |
| 0750117075 | TAPER ROLLER BEARING | Supports axial and radial loads |
| 2093209095 | DIFFERENTIAL | Manages speed difference between axles |
| 2093309071 | DIFF.HOUSING | Encloses differential gears |
| 0631100223 | SPRING PIN | Secures brake components in place |
| 0730300820 | THRUST WASHER | Reduces axial friction |
| 4482360002 | AXLE BEVEL GEAR | Transfers power to wheel hub |
| 2097309085 | DIFFERENTIAL AXLE | Connects differential to wheels |
| 5838300811 | THRUST WASHER | Prevents gear end-play |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Changes rotational direction |
Frequently Asked Questions
Q: Can the ZF 2093.128.018 SERVICE BRAKE be rebuilt instead of replaced?
A: While some shops attempt to rebuild this brake with aftermarket seals, OEM replacement is strongly recommended for construction machinery. The original part uses case-hardened friction surfaces that cannot be duplicated in a rebuild, and any deviation risks brake fade under heavy loads.
Q: How do I confirm this brake fits my ZF WG200 transmission?
A: Verify your transmission serial number and measure the brake mounting bolt pattern. The 2093.128.018 uses a 4-bolt pattern with 130 mm spacing. Cross-reference with the 2093309071 DIFF.HOUSING to ensure the mating surface is compatible.
Q: What causes premature wear on this service brake?
A: The most common cause is contamination from leaking axle seals, which allows dirt or water into the brake chamber. Always inspect the 0750117075 TAPER ROLLER BEARING for damage during replacement, as a failing bearing can misalign the brake assembly.
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