This standard describes a method for measuring dimensional changes of disc brake pads under the influence of heat. At the same time, it gives an indication of the resistance of whole disc brake pads to heat transfer in the direction of applied pressures. According to the design of the test rig, either one or two disc brake pads are required for testing. For drum brake linings, this standard may also be implemented by reference.
Dimensional changes and the temperatures recorded in accordance with this test method in the zone of contact of the operating forces are measured on disc brake pads whose rubbing surface is pressed against a heated plate subjected to a given temperature-time programme.
1 Scope
This standard specifies a combined method of measuring disc brake pads to determine their dimensional changes in relation to temperature and their resistance to heat transfer.
The dimensions concerned are:
——thickness dimension;
——certain dimensions of the lining outline when their variation may involve a misfunctioning of the brake.
This standard applies to disc brake pads for road vehicles. Their dimensions shall not exceed 80 mm in depth, 120 mm in width and 20 mm in thickness, being of integral moulded or bonded type, and the backing plate of solid type.
2 Normative References
GB/T 22310-2008 The following standards are cited：
