Automotive Hoses: Essential Components of Every Vehicle

[Counterman]

Without the seemingly simple device called a hose, many things would not be possible, including the automobile. Automotive hoses provide the only method to transfer fluids or air between a fixed and a moving component. In the world of the automobile, this happens frequently.

Modern vehicles have fewer hoses because electronics have replaced some hydraulic or air-operated systems. Instead of hoses, wires now provide current to the components. Remember vacuum-operated locks? These were common from the 1960s through the 1980s to operate door, trunk, and fuel door locks. A series of hoses ran throughout the vehicle to power the actuators.

Some vehicles used vacuum from the engine and stored it in a reservoir, while others used an electronic vacuum pump. These systems often proved quirky, so electronics eventually replaced them. The most notable hose elimination occurred with the shift from hydraulic power steering to electronic systems. This change pleased many drivers.

However, even as electronic technology improves, automotive hoses remain necessary. Older systems will continue to be on the road for many years. You may still see vacuum-operated locks occasionally.

Understanding the Variety of Automotive Hoses

Automotive hoses vary based on their intended application. Each hose has a specific descriptor that indicates its purpose. Let’s look at some of the most common types.

Coolant Hoses: Handling Heat and Flow

Coolant hoses are among the most complex automotive hoses. Most have bends to route them from one location to another without rubbing against other components. These molded hoses retain a specific shape for proper flow and fit.

Always use the correct coolant hose for the application. These hoses withstand heat and the corrosive effects of coolant. Over time, coolant becomes more corrosive, so follow the manufacturer’s flush schedule.

Brake Hoses: Ensuring Safe Hydraulic Pressure

Brake hoses play a critical role in transferring hydraulic pressure to brake calipers or wheel cylinders. Among automotive hoses, brake hoses experience the most movement. They must handle high pressure during braking.

Brake hoses also withstand the corrosive nature of brake fluid. As brake fluid ages, it becomes more corrosive, making regular flushing essential. Some brake hoses have grommets or protective sleeves to prevent rubbing.

Hydraulic hoses, including brake hoses, feature crimped ends for durability. Machines perform this crimping to handle high pressure. Always replace brake hoses with exact-fit replacements to ensure safety.

Fuel Hoses: Meeting Specific Performance Standards

Some fuel hoses have crimped ends, requiring direct replacements. However, many fuel hoses come in bulk, allowing customization. All fuel hoses carry ratings for pressure, chemical resistance, permeation, temperature, and kink resistance.

The Society of Automotive Engineers (SAE) standard indicates the hose’s requirements. Different applications require specific hoses, such as low-pressure hoses for carburetors or high-pressure hoses for fuel-injected systems. Never use a hose without confirming it meets the necessary specifications.

Hydraulic Hoses: Managing High-Pressure Systems

Aside from brake hoses, many hydraulic systems in vehicles use hoses. These include power steering, oil, and transmission cooler hoses, as well as hydraulically controlled suspension systems.

These hoses feature crimped ends to withstand pressure. They attach using banjo-type or threaded fittings. Most are available as direct-fit hoses, but older vehicles may require custom-made hoses.

Washer and Vacuum Hoses: Small but Important

Washer and vacuum hoses have smaller diameters and typically handle air or washer fluid. Even though these hoses seem less critical, improper use can cause safety issues. Bad vacuum hoses can lead to drivability problems or stalling.

To ensure reliability, the SAE standard covers windshield washer and vacuum tubing. These hoses must always perform as expected to maintain vehicle safety.

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