2. Trim requirements

Brake linings have to meet a number of requirements in addition to purely functional ones, with the coefficient of friction in first place and low wear in second.

Additional constraints are added: technical, economic, comfort and environmental.

The selection criteria are in the following order:

• the stability of the coefficient of friction µ ;

• asbestos-free trim ;

• a silent lining for vibration-free braking;

• a seal that maintains good hot performance and does not spark;

• a seal guaranteeing wear of the shoe/rotor in relation to the desired application and without corrosion of the counter-material;

• minimum compressibility...