ig. 7—Deformed Specimen of Vacuum Brake Hose(c) After 5 seconds release the force and record the peak load applied.(d) Repeat the procedure four times permitting a 10-second recovery period between load applications.S10.10 End fitting corrosion resistance test. Conduct the test specified in S6.11 using a vacuum brake hose assembly.S10.11 Constriction test. Perform the constriction test in S6.12 using a vacuum brake hose, except that the spherical diameter “A” of the plug gauge in Figure 4, or the diameter of the rigid spherical ball in S6.12.3(a), shall be 75 percent of the nominal inside diameter of the vacuum brake hose if it is heavy duty, or 70 percent of the nominal inside diameter of the vacuum brake hose if it is light duty.S11. Requirements—Plastic air brake tubing, plastic air brake tubing assemblies, and plastic air brake tubing end fittings.11.1 Construction. Each plastic air brake tubing assembly shall be equipped with permanently attached end fittings or reusable end fittings. Plastic air brake tubing shall conform to the dimensional requirements specified in Table VII. (S12.1)Table VII—Plastic Air Brake Tubing Dimensions