Overview
The ZF 5838.300.475 BRAKE LINE is a critical hydraulic conduit within the final drive assembly of heavy-duty construction machinery. This OEM genuine part channels pressurized brake fluid from the transmission control valve directly to the wheel brake cylinders, ensuring precise actuation and release of the service brakes. Positioned along the axle housing, the brake line (SKU 5838.300.475) must withstand high cyclic pressures and exposure to abrasive debris. A failure here compromises the entire braking circuit, making this component essential for safe machine operation in demanding environments like mining and earthmoving.
Symptoms of Failure
- Visible hydraulic fluid seepage near the axle flange: A cracked or corroded brake line often produces a slow drip of transmission oil, leaving dark stains on the 5838022003 REAR AXLE housing.
- Spongy or delayed brake pedal response: Air ingress through a compromised line causes a soft pedal feel, requiring multiple pumps to achieve stopping force.
- Uneven brake drag or wheel lockup: A partially blocked line can cause the 5838109001 DIFFERENTIAL to receive inconsistent pressure, leading to erratic braking on one side.
- Complete loss of braking power: A ruptured brake line results in immediate fluid loss, triggering low-pressure warnings and rendering the service brakes inoperative.
Technical Specifications
| Part Number | 5838.300.475 |
| Type | Hydraulic brake line (steel tube with flared ends) |
| Material | Double-walled steel, zinc-nickel plated |
| Length | Approx. 480 mm (center-to-center) |
| Tube Outer Diameter | 6.35 mm (1/4 inch) |
| Thread Size | M10 x 1.0 (both ends) |
| Weight | 0.12 kg |
| OEM Reference | ZF 5838.300.475 |
| Operating Pressure | Up to 120 bar (peak) |
Compatibility
This brake line is engineered for ZF WG series transmissions commonly used in wheel loaders and graders. It directly fits the WG180, WG200, and WG310 models where it connects the axle-mounted valve block to the brake caliper. The line also integrates with the 5838300128 DIFFERENTIAL HOUSING via a dedicated bracket. For proper installation, ensure the 0750117075 TAPER ROLLER BEARING is correctly seated to avoid line misalignment. Always replace the copper sealing washers when servicing this part.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838022003 | REAR AXLE | Houses final drive gears and brake assembly |
| 5838109001 | DIFFERENTIAL | Distributes torque between wheels |
| 0750117075 | TAPER ROLLER BEARING | Supports axle shaft radial loads |
| 5838300128 | DIFFERENTIAL HOUSING | Encloses differential gears and bearings |
| 0631329086 | SPRING PIN | Secures brake line bracket to housing |
| 5838300129 | THRUST WASHER | Reduces axial play in differential |
| 5838300130 | THRUST WASHER | Controls side gear clearance |
| 5838300131 | AXLE BEVEL GEAR | Transfers power to wheel hubs |
| 5838300132 | COMPENS. STUB AXLE | Compensates for axle deflection |
| 5838300133 | COMPENS. STUB AXLE | Opposite-side deflection compensator |
