Sunsong 3405377 Power Steering Return Line Hose Assembly - Gear To Cooler

Power Steering Return Line for Audi A8 Quattro

This Sunsong power steering return line hose assembly is built for the 2004-2010 Audi A8 Quattro, Gear To Cooler application. Part number 3405377 is a direct-fit fluid transfer hose assembly engineered around the vehicle’s original routing and connection points.

Made with CSM material and formed to the correct length, this hose assembly supports clean return-side fluid flow between the steering gear and cooler on the Audi A8 Quattro. Sunsong focuses on exact form, fit, and function, with manufacturing practices centered on OE-style replacement accuracy.

Key Features

• Fits 2004-2010 Audi A8 Quattro, Gear To Cooler
• Part number 3405377
• CSM hose material for automotive fluid transfer use
• 52.36 in. overall length for the specified routing
• Banjo fitting on End 1, ID hose connection on End 2
• No bracket included
• No switch port included

Detailed Description

Sunsong 3405377 is a power steering return line hose assembly for the Audi A8 Quattro, designed for the gear-to-cooler path used on 2004-2010 models. The assembly uses a banjo fitting at one end and an ID hose connection at the other, matching the return-line layout required for this application. With a measured length of 52.36 inches and CSM construction, it is built to follow the original hose routing and connection style. This part cross-references Dorman - HELP 81345 for the same application.

Sunsong is a vertically integrated manufacturer focused on automotive fluid transfer hoses and lines, with development centered on installer needs and OE-level fitment. Part number 3405377 is intended for buyers searching for a power steering return hose for Audi A8 Quattro steering systems, a return line hose assembly for 2004-2010 Audi A8 Quattro, or an OE-style steering gear to cooler hose replacement.

Common Problems This Part Can Address

• Cracked or leaking power steering return hose
• Fluid seepage at the banjo or hose connection
• Restricted return flow from aged hose material
• Incorrect hose routing after a failed replacement
• Noise or steering performance issues related to low fluid level from a leak

Installation Notes and Tips

Verify the vehicle is a 2004-2010 Audi A8 Quattro with the Gear To Cooler routing before installation. Compare the original hose shape, fitting style, and overall length to part number 3405377 before removal. Inspect mating surfaces, clamps, and connection points for wear or contamination, and confirm the steering system is properly bled after service.

Quality Assurance

Sunsong manufactures automotive fluid transfer components with a focus on OE-style form, fit, and function. The brand’s vertically integrated process supports consistent production standards for steering hose replacement applications such as the Audi A8 Quattro power steering return line hose assembly.