Overview
The ZF 5838.300.431 BRAKE LINE is a critical hydraulic conduit within the final drive assembly of heavy-duty construction machinery. This OEM genuine part delivers pressurized transmission fluid to the service brake piston, ensuring consistent clamping force on the brake discs. Positioned between the axle housing and the brake actuator, the 5838.300.431 line must withstand extreme pressure spikes and thermal cycling. As a direct replacement, this brake line restores the integrity of the hydraulic circuit, preventing fluid starvation to the braking system. The SKU 5838.300.431 is precision-formed to match factory routing, eliminating the need for field modifications during installation.
Symptoms of Failure
- External hydraulic fluid seepage at axle connection points – A cracked or corroded brake line will drip transmission oil, leaving visible puddles under the wheel hub. This often triggers low-fluid warnings on ZF-equipped loaders and graders.
- Spongy or delayed brake pedal response – Air ingress through a compromised 5838.300.431 line introduces compressibility into the hydraulic system, causing a soft pedal feel and increased stopping distance.
- Uneven brake pad wear on one wheel end – Restricted flow through a kinked or partially blocked brake line reduces pressure to one side of the axle, leading to premature wear on the opposite brake assembly.
- Overheating differential housing – When the brake line fails to deliver adequate cooling flow, the 5838109001: DIFFERENTIAL can overheat, accelerating gear and bearing degradation.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 5838.300.431 |
| Material | Seamless cold-drawn steel tube with zinc-nickel plating |
| Tube Outer Diameter | 12 mm (0.472 in) |
| Wall Thickness | 1.5 mm (0.059 in) |
| Overall Length (bend-to-bend) | 620 mm (24.4 in) |
| Fitting Thread Size | M16 x 1.5 (both ends) |
| Weight | 0.34 kg (0.75 lbs) |
| OEM Reference | ZF 5838.300.431 |
| Burst Pressure Rating | 350 bar (5,076 psi) |
Compatibility
This brake line is engineered for ZF heavy-duty powershift transmissions and drive axles commonly found in construction machinery. It directly fits the WG180 and WG200 series final drives, as well as the EC160 and EC210 torque converter-integrated axles. The 5838.300.431 is also compatible with the 5838022003: REAR AXLE assembly used in telescopic handlers and wheel loaders. For complete axle rebuilds, this brake line must be paired with the 5838300128: DIFFERENTIAL HOUSING and the 0750117075: TAPER ROLLER BEARING to ensure proper alignment of the rotating components.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838022003 | REAR AXLE | Houses the final drive and brake assembly |
| 5838109001 | DIFFERENTIAL | Distributes torque between wheel ends |
| 0750117075 | TAPER ROLLER BEARING | Supports axle shaft radial and axial loads |
| 5838300128 | DIFFERENTIAL HOUSING | Encloses differential gears and bearings |
| 0631329086 | SPRING PIN | Secures brake line bracket to axle housing |
| 5838300129 | THRUST WASHER | Controls axial play in differential assembly |
| 5838300130 | THRUST WASHER | Secondary axial clearance shim |
| 5838300131 | AXLE BEVEL GEAR | Transfers power from pinion to wheel hub |
| 5838300132 | COMPENS. STUB AXLE | Left-side wheel spindle support |
| 5838300133 | COMPENS. STUB AXLE | Right-side wheel spindle support |
