
This 21ft flexible rubber brake hose is engineered to meet DOT standards for hydraulic trailer brake systems. Primarily used on boat trailers, it can also serve any trailer equipped with hydraulic brakes. Typically, it runs from the master cylinder or surge coupler along the frame to the first axle brake assembly. Rated for high-pressure applications, this hose works with both drum and disc brakes, including those using surge couplers or electric-over-hydraulic units. Its UV-rated construction protects against sun and saltwater deterioration, ensuring long-lasting performance in harsh marine environments. The hose is fitted with durable brass 3/16-inch male inverted flare fittings, featuring a standard 3/8"-24 thread for a secure, leak-free connection with most trailer brake components such as calipers, wheel cylinders, master cylinders, and solenoid valves. The swivel design of the fittings prevents twisting during installation for optimal performance.
Product Specifications:
- Length: 21 ft (254 inches)
- Material: Flexible, UV-rated rubber
- Certification: DOT approved
- Fitting Type: Brass male inverted flare
- Fitting Size: 3/16-inch with 3/8"-24 thread
- Pressure Rating: High pressure for drum/disc brakes
- Application: Hydraulic trailer brake systems (boat trailers, etc.)
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Description |
Material |
Overall Length |
Hose I.D. |
Fitting Thread |
Application |
Brake Line |
Rubber |
21 ft |
1/8'' |
3/8"-24 |
calibrated pressure valves, called brake lines, that let the car know when you want to slow down. The hoses are thin tubes filled with pressurized air that connect the master cylinder in the cabin to the brake calipers via the wheel cylinders and brake pads. |


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