Overview
The ZF 5838.300.368 BRAKE LINE is a critical hydraulic conduit within the transmission assembly, responsible for directing pressurized oil to the brake pistons for controlled deceleration and holding torque. This OEM genuine part ensures precise fluid delivery under high-pressure conditions, directly influencing clutch pack engagement and overall drivetrain response. The SKU 5838.300.368 is specifically engineered to maintain the structural integrity of the hydraulic circuit, preventing pressure drops that compromise braking performance in heavy-duty construction machinery.
Symptoms of Failure
- Hydraulic fluid seepage at connection points – Visible oil droplets or wet spots around the brake line fittings indicate micro-cracks or seal degradation, leading to gradual pressure loss.
- Intermittent brake drag or delayed release – A worn or internally collapsed brake line causes residual pressure in the circuit, resulting in overheating and sluggish disengagement of the brake packs.
- Erratic transmission shifting under load – When the brake line fails to deliver consistent pressure, the transmission may exhibit harsh or delayed shifts, particularly during low-speed maneuvering in construction sites.
- Audible hissing or fluid aeration – A compromised line can introduce air into the hydraulic system, producing a distinct hissing sound and causing spongy brake pedal feel or uneven torque application.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 5838.300.368 |
| Material | Seamless cold-drawn steel with zinc-nickel plating |
| Length | 385 mm (center-to-center fitting) |
| Tube Outer Diameter | 8.0 mm |
| Wall Thickness | 1.2 mm |
| Weight | 0.18 kg |
| OEM Reference | ZF 5838.300.368 |
| Operating Pressure | 25 bar (max 35 bar peak) |
| Thread Type | M12 x 1.5 (both ends) |
Compatibility
This brake line is designed for ZF heavy-duty powershift transmissions commonly used in wheel loaders, graders, and dozers. It is a direct fit for the WG180 and WG200 series, as well as the 4WG-200 and 5WG-180 variants. The line routes between the control valve body and the brake piston housing, and it is often replaced alongside the 5838022003: REAR AXLE assembly and the 5838109001: DIFFERENTIAL unit. When rebuilding the final drive, technicians should also inspect the 0750117075: TAPER ROLLER BEARING and the 5838300128: DIFFERENTIAL HOUSING for wear, as these components share the same lubrication circuit and are frequently serviced together.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838022003 | REAR AXLE | Transmits torque from differential to wheel hubs |
| 5838109001 | DIFFERENTIAL | Distributes power between left and right wheels |
| 0750117075 | TAPER ROLLER BEARING | Supports axial and radial loads on axle shafts |
| 5838300128 | DIFFERENTIAL HOUSING | Encloses differential gears and bearings |
| 0631329086 | SPRING PIN | Secures brake line brackets to housing |
| 5838300129 | THRUST WASHER | Reduces friction between rotating gears |
| 5838300130 | THRUST WASHER | Controls axial play in differential assembly |
| 5838300131 | AXLE BEVEL GEAR | Transfers power from pinion to ring gear |
| 5838300132 | COMPENS. STUB AXLE | Compensates for axle shaft misalignment |
| 5838300133 | COMPENS. STUB AXLE | Secondary compensation for driveline geometry |
