A-A-52522 Lining Brake, And Lining Material Brake: Automotive (Metric)This CID covers automotive brake lining sets and brake lining material used in commercial and military vehicles. Except for the following: heavy construction, heavy military, industrial aeronautical, and any other application where the friction material is compounded specifically for a special purpose vehicle.

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A-A-52522B

3.3.1 Coefficients of friction. Values for coefficients of friction shall not be less than as specified in Table II for the types, categories and classes shown. To meet minimum requirements, a brake lining shall have:

a. Minimal normal friction coefficient as specified in Column a, based on the average of five tests.

b. Minimal hot friction coefficient as specified in Column b, based on the average of five tests.

c. Minimal coefficient of friction as specified in Column c, based on each of five tests at the following points:

(1) Between 93�C (200�F) and 260�C (500�F), inclusive, on the second fade run.

(2) Between 148�C (300�F) and 93�C (200�F), inclusive on the second recovery run.

3.3.2 Wear. Wear shall not exceed the values specified in Table II for the types, categories and classes shown.

TABLE II. Coefficient of friction and wear tolerances.

Type	Category	Class	Friction coefficient			Maximum wear
Type	Category	Class	a	b	c	mm	in.
I	A	L	0.25	0.20	0.18	0.75	0.030
		M	0.25	0.20	0.18	0.8	0.035
		H	0.25	0.20	0.18	1.0	0.040

I	B	L	0.28	0.23	0.21	0.75	0.030
		M	0.28	0.23	0.21	0.8	0.035
		H	0.28	0.23	0.21	1.0	0.40

II & III	-	-	0.030	0.020	0.15	2.0	0.075

3.4 Identification and marking. Identification and marking of the brake lining shall be permanent and legible and shall include as a minimum, the manufacturer�s CAGE code and part or identification number (PIN). Lining furnished in rolls, shall be marked at intervals not to exceed 305 mm (12 in.) throughout the length of the roll. Month and year of manufacture, by numerical

code or other means, shall also be marked on each item, or at each interval.

4. REGULATORY REQUIREMENTS

4.1 Recovered materials. The offeror/contractor is encouraged to use recovered materials to the extent practicable, in accordance with paragraph 23.403 of the Federal Acquisition Regulation (FAR).