Overview
The ZF 5838.124.001 PARKING BRAKE is a critical safety component designed to lock the output shaft of heavy-duty ZF transmissions, preventing unintended vehicle movement when stationary. This OEM genuine part integrates directly into the driveline assembly, typically mounted on the rear of the transmission housing. As a spring-applied, hydraulically-released mechanism, it ensures fail-safe operation in construction machinery such as wheel loaders, graders, and dump trucks. The SKU 5838.124.001 is engineered to withstand high torque loads and harsh environmental conditions, making it essential for maintaining operational safety on job sites. When paired with a properly maintained 5838022003: REAR AXLE, this parking brake ensures reliable holding power even on steep inclines.
Symptoms of Failure
- Inability to hold on slopes: If the machine rolls forward or backward when parked on an incline, the parking brake disc stack or actuator may be worn.
- Hydraulic fluid leaks near the brake housing: Damaged seals or piston O-rings in the 5838.124.001 unit often cause external oil seepage, leading to pressure loss.
- Grinding or squealing noises during engagement: Worn friction plates or contaminated oil can produce metallic sounds when the brake is applied.
- Delayed or incomplete release: A stuck piston or degraded return springs may cause the brake to drag, reducing machine speed and overheating the driveline.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 5838.124.001 |
| Type | Spring-Applied, Hydraulically-Released Parking Brake |
| Outer Diameter | Approx. 280 mm |
| Overall Height | Approx. 95 mm |
| Weight | ~8.5 kg |
| Housing Material | Ductile Iron (GGG-40) |
| Friction Material | Sintered Bronze on Steel |
| Max Operating Pressure | 18 bar (261 psi) |
| OEM Reference | ZF 5838.124.001 |
Compatibility
This parking brake is primarily used in ZF’s heavy-duty powershift transmission series, including the WG180, WG200, and WG210 models. It also fits select 4WG-200 and 6WG-200 variants commonly found in construction loaders and dozers. The 5838.124.001 interfaces directly with the 5838109001: DIFFERENTIAL and the 5838300128: DIFFERENTIAL HOUSING to secure the final drive. For optimal performance, always replace the 0750117075: TAPER ROLLER BEARING when servicing the brake assembly, as bearing wear can misalign the brake disc pack.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838022003 | REAR AXLE | Transmits torque from differential to wheels |
| 5838109001 | DIFFERENTIAL | Distributes power between left and right wheels |
| 0750117075 | TAPER ROLLER BEARING | Supports axial and radial loads on shafts |
| 5838300128 | DIFFERENTIAL HOUSING | Encloses and supports differential gears |
| 0631329086 | SPRING PIN | Secures brake components to housing |
| 5838300129 | THRUST WASHER | Reduces axial friction in differential |
| 5838300130 | THRUST WASHER | Provides wear surface for bevel gears |
| 5838300131 | AXLE BEVEL GEAR | Transfers power from differential to axle shafts |
| 5838300132 | COMPENS. STUB AXLE | Balances torque between drive wheels |
| 5838300133 | COMPENS. STUB AXLE | Compensates for wheel speed differences |
