Fluid Lines

Fluid Lines for Semi-Trucks

Fluid Lines in a semi-truck is a flexible tube that carries hydraulic fluid or other fluids to various vehicle components. Also, these lines are essential for the operation of many systems in a semi-truck, including the brakes, steering, suspension, and air conditioning.

Types of fluid lines in a semi-truck:

  • Hydraulic lines: These lines carry pressurized hydraulic fluid to actuate hydraulic components, such as power steering pumps, brake cylinders, and lift cylinders.

  • Airlines: Lines carry pressurized air to operate air brakes, suspension components, and air horns.

  • Coolant lines: They carry coolant fluid to circulate through the engine and radiator to maintain engine temperature.

  • Fuel lines: These lines carry fuel from the fuel tank to the engine.

Functions in a semi-truck:

  • Transferring fluid: The lines transport hydraulic fluid, air, coolant, or fuel to various components of the vehicle.

  • Actuation: Hydraulic lines transmit pressurized fluid to hydraulic actuators, which generate force to operate components like brakes, steering, and suspension.

  • Temperature regulation: Coolant lines maintain engine temperature within a safe range, preventing overheating or freezing.

  • Fuel delivery: Fuel lines supply the engine with fuel for combustion, powering the vehicle.

Materials for fluid lines in a semi-truck:

  • Hydraulic lines: Rubber, polyurethane, or steel-reinforced hoses are commonly used for hydraulic lines due to their durability and resistance to wear and tear.

  • Airlines: Nylon or rubber hoses are often used for airlines due to their flexibility and ability to withstand air pressure.

  • Coolant lines: Rubber or plastic hoses are commonly used for coolant lines due to their resistance to high temperatures and corrosion.

  • Fuel lines: Steel or stainless steel lines are generally used for fuel lines to prevent leaks and contamination.


  • Regular inspections: Lines should be regularly inspected for signs of wear, damage, or leaks.

  • Replacement: Worn or damaged lines should be replaced promptly to avoid potential leaks or failures.

  • Cleaning: Lines should be cleaned regularly to remove dirt, debris, or contaminants that could cause damage.

  • Protective coatings: The lines may be coated with protective materials like lubricants or heat-resistant coatings to extend their lifespan.

Finally, at Custom Creek Fabrication, we can build any type of line you need to maintain your truck. Contact us today!

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