Disc brake rotors are available in many sizes and configurations. You have the solid type and ventilated. Ventilated rotors have webbing between the 2 surfaces where the disc pads touch. Solid rotors are just that, solid. Standard disc rotors have a smooth surface where the pad touches, but slotted rotors have slots on this surface and then cross drilled rotors have holes drilled all the way through this surface. Some brand of rotor has dimples on this surface with slots, dimples are just like a drill has made an indentation into the surface but not a full hole. The slotting assists in allowing the gases from braking to escape from being caught between the pad and surface and also assists in keeping the pad surface clean. The cross drilled rotor allows the gases to escape into the centre of the rotor before escaping into the atmosphere via the webbing. The webbing of the rotor comes in several designs.
Disc rotors are manufactured to certain thicknesses by the manufacturer and nearly all cars are different. You have to check the specifications and measure the actual rotor thickness before machining as it is illegal to machine a disc brake rotor to a measurement equal to or under the minimum thickness. Sometimes this minimum thickness is cast into or stamped into the disc rotor.
SLOTTED OR CROSS-DRILLED ROTORS ARE MACHINEABLE.
Some technicians are not in favour of machining. If any cracks appear in the disc brake rotor, it should be replaced.
There is no definite number of kilometres or time frame a disc brake rotor should last as consideration has to be taken into account where it was made, what vehicle it is fitted to, what type of driving conditions, what style of driver has been driving the vehicle, what type of disc brake pads were used.
Brake Force Plus as of November 2014 will be carrying one of the largest selections of disc rotor part numbers in North Queensland. BrakeForce Plus has access to brands like RETON, IBS, PROTEX, RELIANCE, DBA, RDA, BREMBO.
There is NO warranty for disc brake rotors of any type when used for any type of motorsport.
Brake drums are normally only found on the rear of cars but are found on the front and rear of some small trucks and older vehicles.
Brake drums are machinable. Brake drums have wear limits just like disc rotors and therefore specifications should be checked prior to machining. There should be no cracking at all, if any the brake drum should be replaced.
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