In principle, HAICHEN brake discs (standard and perforated) are made in strict accordance with the dimensions of the corresponding original spare parts and the materials used (in accordance with GVO, ISO9001, ISO/TS16949 standards).

The perforated models have been tested by TÜV Nord in terms of functionality, operational reliability and wear resistance and have been approved by the German Federal Automobile Administration for use as specified in production vehicles; the brake discs meet the general requirements related to mechanical and thermal loads when used for the intended purpose.

Brake discs used in retrofit vehicles and vehicles participating in motorsport (or the like) are often required to meet higher requirements in terms of mechanical and thermal load capacity. The same applies to the brake lining.

Radial or net cracks on the brake disc with holes are normal. According to the TÜV NORD Directive "Requirements for the inspection of spare/special brake discs and brake drums of vehicles", radial or net-like cracks are allowed within the following limits:

Length: Max. 0.5 x friction ring width

Width: max. 0.2mm

Depth: max. 0.2mm

If the above limit values are not exceeded, it can be determined from the above instructions that no damage is present. Severe cracking occurs only because the mechanical and/or thermal loads are too high. Possible causes:

Not following the specified running-in phase (see running-in instructions)

personal driving habits

High intensity use

Brake pad mismatch (hard, greased, damaged, worn)

Defective assembly (brake discs and/or brake linings)

Other component failures (brake system, axle suspension, steering)