MIL-DTL-3992F
3.7.2 Requirements applicable to type I air brake hose and hose assemblies.
3.7.2.1 Proof pressure test. When tested as specified in 4.8.3.1 an assembled length of hose shall
exhibit no air leaks.
3.7.2.2 Assembly tension test. When tested as specified in 4.8.3.2 hose assemblies shall withstand a
minimum pull of 325 pounds (147.42 kg) without separation from the fittings or rupture of the hose
structure.
3.7.2.3 Elongation and contraction. When tested as specified in 4.8.3.3 type I hoses or hose
assemblies shall not contract in length more than 3 percent or elongate more than 5 percent.
3.7.2.4 High-temperature resistance. When tested as specified in 4.8.3.4 the hose shall show no
cracks, charring, or disintegration externally or internally when straightened after high temperature aging
and flex tests.
3.7.2.5 Low-temperature resistance. When tested as specified in 4.8.3.5 hoses shall show no breaks
or cracks after being conditioned at low temperature.
3.7.3 Requirements applicable to type II vacuum brake hose and hose assemblies.
3.7.3.1 Aging test. When tested as specified in 4.8.4.1 hose or hose assemblies shall show no
cracks, breaks, or other external visual disintegration after being bent against a form. The hose or hose
assembly shall then be subjected to a proof pressure 4.8.3.1 and examined for internal disintegration.
3.7.3.2 Cold test. When tested as specified in 4.8.4.2 the hose shall pass the hydrostatic proof
pressure specified in 4.8.3.1.and then visually inspected. The hose when examined externally shall show
no signs of cracks. The hose shall be cut lengthwise and the internal tube shall show no signs of cracks.
3.7.3.3 Collapse resistance (vacuum) test. When tested as specified in 4.8.4.3 the outside diameter
of a hose specimen shall not collapse more than 1/16 inch (.0625 inch) (1.59 mm).
3.7.3.4 Hot vacuum collapse and degradation. When tested as specified in 4.8.4.4 the outside
diameter of a hose specimen shall not collapse in excess of 15% of the original OD for light wall vacuum
brake hose (7/32, 11/32, 15/32), and 10% of the original OD for heavy wall vacuum brake hose (1/4, 3/8,
1/2, 5/8, 3/4, 1) (reference SAE-J1403) after conditioning and application of an internal vacuum. There
shall be no external or internal embrittlement or degradation. There shall be no leakage during proof
pressure testing specified in SAE-J1403.
3.7.3.5 Bend collapse test. When tested as specified in 4.8.4.5 the outside diameter of a hose
specimen shall not collapse in excess of the values shown in table VII after being bent until the ends
meet.
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