Overview
The ZF 5838.300.432 BRAKE LINE is a critical hydraulic conduit within the final drive assembly of heavy-duty construction machinery. This OEM genuine part delivers pressurized brake fluid from the transmission control valve directly to the wheel brake actuators, ensuring precise stopping force in demanding environments. Positioned along the axle housing, the 5838.300.432 brake line connects the hydraulic circuit to the 5838022003: REAR AXLE assembly, where it interfaces with the 5838109001: DIFFERENTIAL unit. Constructed from corrosion-resistant steel tubing, this line withstands extreme pressure fluctuations and thermal cycling common in excavators and wheel loaders. The SKU 5838.300.432 is engineered to ZF’s original specifications, guaranteeing a perfect seal and flow rate for consistent braking performance.
Symptoms of Failure
- Hydraulic fluid seepage at axle connection points – Corrosion or vibration fatigue causes the brake line to develop micro-cracks, leading to visible oil leaks near the 5838300128: DIFFERENTIAL HOUSING. This often manifests as a slow drip after machine shutdown.
- Spongy or delayed brake pedal response – A compromised brake line introduces air into the hydraulic circuit, resulting in a soft pedal feel and increased stopping distance. Operators may notice inconsistent braking during repetitive loading cycles.
- Uneven brake pad wear on one wheel – Restricted fluid flow through a kinked or partially blocked line causes asymmetric braking force, accelerating wear on the affected side’s friction materials.
- Complete brake circuit failure in cold weather – Internal corrosion particles can clog the line, causing sudden loss of braking pressure when hydraulic oil viscosity increases at low temperatures.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 5838.300.432 |
| Material | Seamless cold-drawn steel tubing, zinc-nickel plated |
| Tube Outer Diameter | 10 mm (0.394 in) |
| Wall Thickness | 1.5 mm (0.059 in) |
| Overall Length | 420 mm (16.54 in) |
| Bend Radius (minimum) | 25 mm (0.984 in) |
| Working Pressure | 180 bar (2,610 psi) |
| Burst Pressure | 720 bar (10,440 psi) |
| Weight | 0.34 kg (0.75 lb) |
| OEM Reference | ZF 5838.300.432 |
| Thread Type | M12 x 1.5 metric flare |
Compatibility
This brake line is designed for ZF’s heavy-duty transmission families used in construction machinery. It is a direct fit for the WG180 and WG200 series power shift transmissions, commonly paired with the 5838022003: REAR AXLE. The part also integrates with the WG150 and WG250 models when equipped with wet disc brakes. For proper installation, ensure the 0750117075: TAPER ROLLER BEARING is correctly seated in the differential housing to avoid misalignment of the brake line bracket. Always verify the routing path against the original line to prevent interference with the 5838109001: DIFFERENTIAL assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838022003 | REAR AXLE | Transmits torque to wheels; houses brake line routing |
| 5838109001 | DIFFERENTIAL | Distributes power between wheels; interfaces with brake circuit |
| 0750117075 | TAPER ROLLER BEARING | Supports axle shaft; ensures brake line bracket alignment |
| 5838300128 | DIFFERENTIAL HOUSING | Encloses differential gears; provides brake line mounting points |
| 0631329086 | SPRING PIN | Secures brake line clips to housing |
| 5838300129 | THRUST WASHER | Reduces axial play in differential assembly |
| 5838300130 | THRUST WASHER | Secondary axial load distribution |
| 5838300131 | AXLE BEVEL GEAR | Transfers power to wheel hubs |
| 5838300132 | COMPENS. STUB AXLE | Supports differential side gears |
| 5838300133 | COMPENS. STUB AXLE | Counterpart for gear compensation |
