Sunsong 3402120 Power Steering Pressure Line Hose Assembly - Pump To Hydroboost

Power Steering Pressure Line Hose for Hydroboost

Sunsong 3402120 is a power steering pressure line hose assembly for hydroboost-equipped Chevrolet and GMC trucks and SUVs. It is built for pump-to-hydroboost routing and uses OE-style male O-ring ends for a direct replacement on listed applications.

Key Features

• Fits pump to hydroboost steering circuits on select 1980-1988 Chevrolet and GMC applications
• 16 mm male O-ring end and 18 mm male O-ring end
• 55.5 in. hose length for the specified routing
• CSM hose material for fluid resistance in power steering service
• Rated for 1,500 psi maximum working pressure, 8,700 psi burst pressure, and 1,600 lb tensile strength
• High-grade steel tubing with zinc electroplating for corrosion and rust resistance
• High-pressure tested before shipment

Detailed Description

This Sunsong power steering pressure line hose assembly is engineered for vehicles using a hydroboost brake assist system, where the pump feeds pressure to the hydroboost unit. It is a direct-fit replacement for applications such as the Chevrolet Blazer, Chevrolet K5 Blazer, Chevrolet C10, GMC Jimmy, and GMC C1500 Suburban in the listed years. Sunsong 3402120 is built to restore proper steering pressure routing on classic GM trucks and SUVs with pump-to-hydroboost plumbing.

The hose assembly is manufactured to exceed original equipment performance standards and uses corrosion-resistant steel tubing with a zinc coating to help withstand humidity, road salt, water, and grime. The pressure hose is precision engineered for the listed fitments and is factory tested for pressure integrity before release.

This part cross-references Four Seasons 55123 and Gates 366850 for the same application.

What It Helps Fix

• Power steering fluid leaks at the pressure line
• Loss of steering assist from a damaged hose
• Cracked, rusted, or fatigued pump-to-hydroboost line sections
• Incorrect hose routing on hydroboost-equipped GM trucks and SUVs
• Pressure loss caused by worn O-ring end connections

Installation Notes and Tips

Verify the end sizes before installation: 16 mm male O-ring on one end and 18 mm male O-ring on the other. Confirm the vehicle uses a pump-to-hydroboost configuration, since this hose is not for standard steering gear routing. Inspect mating seals, brackets, and nearby lines for wear before installing the new hose.

Quality Assurance

Sunsong subjects each hose to high-pressure testing before it leaves the factory. The assembly is built to meet or exceed OE performance expectations for pressure capacity, durability, and corrosion resistance.