Brake hose and Brake lining
Main tasks
Servey on self-certification regarding compliance of brake hose and brake lining
Brake hose test
| Test | Explanation |
|---|---|
| Constriction | Except for that part of an end fitting which does not contain hose, every inside diameter of any section of a hydraulic brake hose assembly shall be not less than 64 percent of the nominal inside diameter of the brake hose |
| Expansion and burst strength | The maximum expansion of a hydraulic brake hose assembly at 1,000 psi, 1,500 psi and 2,900 psi shall not exceed the values specified |
| Whip resistance | A hydraulic brake hose assembly shall not rupture when run continuously on a flexing machine for 35 hours |
| Tensile strength | A hydraulic brake hose assembly shall withstand a pull of 325 pounds without separation of the hose from its end fittings during a slow pull test, and shall withstand a pull of 370 pounds without separation of the hose from its end fittings during a fast pull test |
| Water absorption and burst strength | A hydraulic brake hose assembly, after immersion in water for 70 hours, shall withstand water pressure of 4,000 psi for 2 minutes, and then shall not rupture at less than 5,000 psi |
| Water absorption and tensile strength | A hydraulic brake hose assembly, after immersion in water for 70 hours, shall withstand a pull of 325 pounds without separation of the hose from its end fittings during a slow pull test, and shall withstand a pull of 370 pounds without separation of the hose from its end fittings during a fast pull test |
| Water absorption and whip resistance | A hydraulic brake hose assembly, after immersion in water for 70 hours, shall not rupture when run continuously on a flexing machine for 35 hours |
| Low-temperature resistance | A hydraulic brake hose conditioned at a temperature between minus 49 degrees Fahrenheit (minus 45 degrees Celsius) and minus 54 degrees Fahrenheit (minus 48 degrees Celsius) for 70 hours shall not show cracks visible without magnification when bent around a cylinder as specified |
| Brake fluid compatibility, constriction, and burst strength | Except for brake hose assemblies designed for use with mineral or petroleum-based brake fluids, a hydraulic brake hose assembly shall meet the constriction requirement after having been subjected to a temperature of 248 degrees Fahrenheit (120 degrees Celsius) for 70 hours while filled |
| Ozone resistance | A hydraulic brake hose shall not show cracks visible under 7-power magnification after exposure to ozone for 70 hours |
| Dynamic ozone test | A hydraulic brake hose shall not show cracks visible without magnification after having been subjected to a 48-hour dynamic ozone test |
| High temperature impulse test | (a) Shall withstand pressure cycling for 150 cycles, at 295 degrees Fahrenheit (146 degrees Celsius) without leakage; (b) Shall not rupture during a 2-minute, 4,000 psi pressure hold test, and; (c) Shall not burst at a pressure less than 5,000 psi. |
| End fitting corrosion resistance | After 24 hours of exposure to salt spray, a hydraulic brake hose end fitting shall show no base metal corrosion on the end fitting surface except where crimping or the application of labeling information has caused displacement of the protective coating |
Brake lining test
| Test | Explanation |
|---|---|
| Shear strength | Brake lining shear strength test |
| Compressibility | Brake lining compressibility test |
| Material hardness | Brake lining hardness test |
Test equipment usage
- Rules on performance and standards for vehicl-es and vehicle's parts article 112 subparagraph 2(brake hose), 10(brake lining) and details of execution [attachment 6]