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

Style I - For bonding.

Style II - Drilled for rivets or bolts.

Class L - Up to 2727 kilograms (kg) [Up to 6000 pounds (lbs)].

Class M - 2728 to 4545 kg (6001 to 10 000 lbs).

Class H - Over 4545 kg (over 10 000 lbs).

3. SALIENT CHARACTERISTICS

3.1 Materials. Unless otherwise specified herein; materials shall be in accordance with the manufacturer�s material specification. Asbestos material shall not be used. The use of recovered materials made in compliance with regulatory requirements is acceptable providing that all requirements of this CID are met (see 4.1).

3.1.1 Stability. Lining shall not vary more than as specified in Table I, subsequent to testing in accordance with SAE J160.

TABLE I. Allowable variation for lining thickness.

Lining size

Maximum variation in thickness

mm.

in.

Up to 10

10 - 19

Above 19

Up to 0.38

0.38 - 0.75

Above 0.75

0.3

0.4

0.5

0.010

0.015

0.020

3.1.1.1 Gogan hardness and specific gravity. Unless otherwise specified in the contract (see 7.2), Gogan (or other) hardness shall be certified by the contractor to meet the levels specified in SAE J379. Specific gravity shall be determined by using the procedure described in SAE J380.

3.1.2 Sets or roll(s). Set(s) shall consist of all components required for one axle, shall be preformed and prepared for attachment to specific brake shoes as required (see 7.2). Rolls shall consist of bulk material furnished in lengths, widths and thicknesses as specified (see 7.2). Sets shall be attached, or be prepared for attachment, in one of the following ways:

a. Drilled with rivet or bolt holes for attachment to specific brake shoes.

b. Undrilled, for bonding of lining to the backing shoes.

c. Molded or mechanically attached disc brake pads.

3.1.3 Bonding agent. The bonding agent shall be of the thermo-setting variety. Lining applied to the shoe or pad shall have a shear force exerted to the bond joint per SAE J840. Shear strength of the bonding agent shall be certified by the contractor to meet agreed upon levels. The agent, when cured, shall be unaffected by grease, oil, brake fluid, cleaning fluid, or storage of up to