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

82 degrees Celsius (°C) [180 degrees Fahrenheit (°F)] for periods of up to 2 years. The contractor shall certify to these requirements.

3.1.4 Storage. Both the adhesive in its final cured state, and the lining, after being bonded to the shoe, shall show no undesirable change in properties after periods of up to two years of storage at temperatures ranging from minus (-) 54°C (-65°F) to plus (+) 82°C (180°F). Storage capability shall be certified by the contractor.

3.1.5 Mechanical strength. Lining shall have sufficient mechanical strength to permit secure attachment without damage during assembly or use.

3.2 Design and construction. Unless otherwise specified herein, the design and construction of the brake lining shall be in accordance with the manufacturer’s design standards.

3.2.1 Brake lining tolerance for drum brakes.

3.2.1.1 Lining thickness. Except when variation in thickness is a function of design, surfaces of the drum brake lining shall be essentially parallel. Maximum variation in thickness across the width of the lining shall not be greater than + 0.2 mm (+ 0.008 in.)

3.2.1.2 Rivets and bolts. When riveted or bolted material is specified, rivets or bolts conforming

to SAE J663 shall be provided in the manner and size required for the applicable lining.

3.2.1.3 Radius of curvature. Unless otherwise specified (see 7.2), inside radius of rigid molded lining shall be held to + 0.64 mm (+ 0.025 in.).

3.2.1.4 Lining position. All lining segments shall be properly identified as to position, such as primary, secondary, forward, reverse, inner or outer. Intermixing of primary and secondary linings shall not be permitted.

3.2.2 Brake lining tolerances for disc brakes. Unless otherwise specified (see 7.2), tolerances for disc brake type linings shall be as follows:

a. Flat within 0.15 mm (0.005 in.) on lining surface, and parallel within 0.25 mm (0.010 in.) for integrally molded assemblies.

b. Flat within 0.25 mm (0.010 in.) on both lining surfaces when supplied blank or drilled, and parallel within 0.51 mm (0.020 in.) when assembled on the steel backing.

3.3 Performance. Lining shall perform as specified under the conditions described in SAE J661.