Fault assessment of brake discs
Brake discs exhibit cracking
Thermal shock loads on the surface of the brake disc can cause cracks in the cast structure. These cracks reduce the brake disc’s strength and can, depending on their size and the applied forces, result in material fracture. At what size cracks begin to represent a problem is difficult to say, but to prevent failure with its potentially fatal consequences, brake discs on which cracking is clearly visible without technical aids, should be replaced. It is also worth noting that the likelihood of fracture increases with the length of the cracks.
In addition to presenting a risk of disc fracture, a cracked disc surface acts like a machine tool on the brake pads, causing excessive pad wear, which becomes more pronounced at higher temperatures, at which the crack width increases.