Dorman H621231 Brake Hydraulic Hose - Rear Right Inner

Reliable Brake Hydraulic Hose for BMW Models

The Dorman H621231 brake hydraulic hose is designed to provide dependable brake fluid transfer for select BMW vehicles. Engineered with durable materials, this flexible hose ensures consistent braking performance for models like the 525i, 528i, 530i, 540i, 740iL, 750iL, and M5.

• Compatible with BMW 525i, 528i, 530i, 540i, 740iL, 750iL, and M5 models
• Part number H621231 for precise identification
• Constructed with EPDM rubber hose material for flexibility and durability
• Black outer sleeve made of rubber for protection against wear
• Both ends feature treated steel female fittings with M10 x 1.0 thread diameter
• Overall hose length of 4.95 inches
• Mounting hardware, brackets, gaskets, or seals are not included

Durable Construction and Design Details

This Dorman brake hydraulic hose (part number H621231) is built with an EPDM rubber hose core, known for its resistance to heat, ozone, and brake fluid degradation. The black rubber outer sleeve adds an extra layer of protection against environmental factors and abrasion. Both ends of the hose are equipped with treated steel female fittings, ensuring secure and corrosion-resistant connections. The fittings have a thread diameter of 10 mm (M10 x 1.0), compatible with the brake systems of the specified BMW models. With an overall length of 4.95 inches, this flexible hose is designed to meet exact OEM specifications for reliable brake fluid transfer.

Applications and Problem Resolution

• Replaces worn or cracked brake hydraulic hoses on BMW 525i, 528i, 530i, 540i, 740iL, 750iL, and M5
• Addresses brake fluid leaks caused by hose deterioration
• Restores proper brake pressure and pedal feel
• Prevents brake system failure due to hose damage
• Ensures safe and consistent braking performance

Installation Notes and Tips

Installation of the Dorman H621231 brake hydraulic hose requires basic brake system knowledge and tools. Before installation, ensure the brake system is depressurized and fluid is drained to avoid spills. Verify the hose length and fitting types match the vehicle’s requirements. Since mounting hardware and brackets are not included, reuse existing components or source replacements as needed. After installation, bleed the brake system thoroughly to remove air and confirm proper brake function.

Quality Assurance and Warranty

Dorman manufactures this brake hydraulic hose to meet or exceed OEM standards for fit, form, and function. The use of treated steel fittings and EPDM rubber materials supports long-term durability and resistance to common brake system stresses. While specific warranty details are not provided, Dorman products typically come with a limited warranty against defects in material and workmanship. Consult product documentation or the manufacturer for exact warranty terms.