Sunsong 2203970 Brake Hydraulic Hose - Rear Left

Brake Hose for Rear Left Applications

The Sunsong 2203970 brake hydraulic hose is built for rear left brake service on select Cadillac, Buick, and Oldsmobile vehicles. It is precision engineered for exact fit and uses EPDM hose material with 10 mm banjo and 10 mm female end fittings for a direct replacement on the listed applications.

Compatible With 1986-1991 Cadillac Eldorado, rear left, 1986-1991 Cadillac Seville, rear left, 1986-1991 Buick Riviera, rear left, and other listed rear left applications. The Sunsong 2203970 is made to restore proper hydraulic connection at the wheel end of the brake system.

Key Features

• Part number: 2203970
• Brake hydraulic hose for rear left placement
• EPDM hose material for brake system use
• 10 mm banjo end fitting and 10 mm female end fitting
• 12.67 in. (322 mm) overall length
• Built to meet or exceed DOT, FMVSS 106, and SAE J1401 standards
• High-grade steel tubing with zinc electroplating for corrosion resistance
• Banjo-end applications include new copper washers for sealing

Detailed Description

Sunsong 2203970 is a brake hydraulic hose engineered for exact fit on select rear left applications, including 1986-1991 Cadillac Eldorado, 1986-1991 Cadillac Seville, 1986-1991 Buick Riviera, 1988-1991 Buick Reatta, 1987-1992 Cadillac Allante, and 1986-1991 Oldsmobile Toronado. The hose is manufactured to restore the original brake line connection point and maintain proper hydraulic transfer at the wheel.

This hose is built with EPDM material and precision-formed fittings sized for the listed application. Sunsong 2203970 also uses corrosion-resistant steel tubing with a zinc coating to help protect against humidity, road salt, water, and grime. This part cross-references Dorman - First Stop H38582 for the same application.

What This Part Helps Address

• Brake fluid leakage at the rear left hose connection
• Cracked, swollen, or deteriorated hose material
• Corrosion at the brake hose and fitting area
• Restricted brake fluid flow from an aging hydraulic hose
• Soft or inconsistent brake pedal response caused by hose wear

Installation Notes and Tips

Verify rear left fitment by year, make, and model before installation. Confirm the 10 mm banjo and 10 mm female end fittings match the vehicle connection points, and replace any sealing washers required at the banjo end. After installation, bleed the brake system and inspect all connections for leaks before returning the vehicle to service.

Quality Assurance

Each hose is high-pressure tested before it leaves the factory. Sunsong states that this brake hose meets or exceeds DOT, FMVSS 106, and SAE J1401 standards for brake hose performance and safety.