Inspecting Brake Disc

Inspecting Brake Disc

Ceramic Brake Disc, Visual Characteristics

Checking threaded connectors on the brake disc ring and brake disc cup:

CAUTION!
The brake disc ring and the brake disc cup are attached to each other and must never be separated. Never loosen the threaded connector on the brake disc cup.

The friction surface on a new brake disc already has stress cracks made during the production process. These stress cracks are all different.





• The stress cracks do not mean the ceramic brake disc is faulty.

The stress cracks are somewhat visible on new brake discs and different from each other in strength.

Rotor Cooling Channels, Surface Cracks

The cracks on the surface of the cooling channels - arrow - were produced during the manufacturing process.





• The surface cracks do not mean the ceramic brake disc is faulty.

Cracks near threaded connectors





Checking threaded connectors on the brake disc ring and brake disc cup:

CAUTION!
The brake disc ring and the brake disc cup are attached to each other and must never be separated. Never loosen the threaded connector on the brake disc cup.

If the ceramic brake disc has cracks near the threaded connectors on the cup leading to the friction surface on the brake disc - arrows -, then the brake discs must be replaced.





If the ceramic brake discs have radial cracks near the threaded connectors on the brake disc cup, then the brake discs must be replaced.

Always replace the brake discs on both sides of the axle when:

• the brake discs must replaced because they are worn,

• the replacement brake disc has been technically modified, which can be determined by the revised part number

Brake discs must always be replaced on both sides of the axle. Refer to => [ Front Ceramic Brake Disc, C/SIC Caliper ] Front Ceramic Brake Disc, C/SIC Caliper

Brake pads likewise must always be replaced on both sides of the axle. Refer to => [ Front Brake Pads, Ceramic Brakes ] Front Brake Pads, Ceramic Brakes

Edge Chips

Chips on the edge - arrow - of the brake disc are caused by mechanical damage.





The following are permitted:

• maximum width/depth = 2 mm.

• maximum length = 10 mm

• maximum number of chips on the brake disc = 3

If any of these criteria are exceeded, replace the brake disc. Refer to => [ Front Ceramic Brake Disc, C/SIC Caliper ] Front Ceramic Brake Disc, C/SIC Caliper

Always replace the brake discs on both sides of the axle when:

• the brake discs must replaced because they are worn,

• the replacement brake disc has been technically modified, which can be determined by the revised part number.

Brake discs must always be replaced on both sides of the axle. Refer to => [ Front Ceramic Brake Disc, C/SIC Caliper ] Front Ceramic Brake Disc, C/SIC Caliper

Brake pads likewise must always be replaced on both sides of the axle. Refer to=> [ Front Brake Pads, Ceramic Brakes ] Front Brake Pads, Ceramic Brakes

Ceramic Brake Disc Material Break Down

If the ceramic brake disc starts to show material break down on the friction surface greater than 1 cm,2 - arrow - then the ceramic brake discs must be replaced.





Always replace the brake discs on both sides of the axle when:

• the brake discs must replaced because they are worn,

• the replacement brake disc has been technically modified, which can be determined by the revised part number.

Brake discs must always be replaced on both sides of the axle. Refer to => [ Front Ceramic Brake Disc, C/SIC Caliper ] Front Ceramic Brake Disc, C/SIC Caliper

Brake pads likewise must always be replaced on both sides of the axle. Refer to => [ Front Brake Pads, Ceramic Brakes ] Front Brake Pads, Ceramic Brakes

Cooling Channel Cracks

If the ceramic brake disc has a crack on the friction surface leading to or through the cooling channel, the replace the ceramic brake disc.