A disc brake pad has a rigid, molded, friction material bonded to a steel backing plate for support during brake application. It transforms the hydraulic force of the caliper into a frictional force against the disc.
The proportioning valve divides up the braking effort applied to front and rear wheels under heavy braking, according to how load is distributed across a vehicle.
Brake pads and linings are made from materials which have a high coefficient of friction. The choice of material depends on the braking application, but it needs to be able to absorb and disperse large amounts of heat without braking performance being adversely affected.
