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A ventilated brake rotor (24) includes vent holes (42) between inboard (32) and outboard (34) friction plates. The vent holes (42) are separated by ribs (40) spaced in regular circumferential increments about the rotor (24). The rib pattern (40) is divided into two or more sectors (48) of equal angu

A ventilated brake rotor (24) includes vent holes (42) between inboard (32) and outboard (34) friction plates. The vent holes (42) are separated by ribs (40) spaced in regular circumferential increments about the rotor (24). The rib pattern (40) is divided into two or more sectors (48) of equal angular measure. Within each sector (48), an attenuation region (50) interrupts two or more ribs (40) by replacing the ribs (40) with a cluster of individual pins (54) which may be arranged in radial and circumferential rows. Each attenuation region (50) spans a territory within each sector (48) that is preferably at least 20% and less than 55% of the sector (48) real estate. The rotor (24) completely or at least substantially eliminates vibration modes in objectionable, audible frequencies without adversely affecting the structural integrity, cooling capabilities or functional attributes of the disc brake assembly (22).

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1. A ventilated brake disc rotor for a vehicle braking system, said rotor comprising: an annular inboard friction plate having a central axis;an annular outboard friction plate spaced from said inboard friction plate and concentrically disposed about said central axis;a plurality of ribs disposed be

1. A ventilated brake disc rotor for a vehicle braking system, said rotor comprising: an annular inboard friction plate having a central axis;an annular outboard friction plate spaced from said inboard friction plate and concentrically disposed about said central axis;a plurality of ribs disposed between said inboard and outboard friction plates, said ribs spaced one from another in regular circumferential increments about said central axis with a generally radially extending vent hole defined in the space between adjacent ribs;said plurality of ribs being arranged in four arcuate sectors of equal angular measure, each of said sectors containing an attenuation region in which the regular spacing of said ribs is interrupted, each said attenuation region occupying at least 20% but not more than 55% of the surface area represented by the respective said sector;a pin cluster disposed in each said attenuation region, each said pin cluster including at least two distinct rows of radially aligned pins; said pins disposed in-between and interconnecting said inboard and outboard friction plates, said pins in each said pin cluster being at least six in number and spaced both radially and circumferentially from one another; andsaid at least two rows of pins in each said pin cluster containing an equal number of pins, each said row including a radially innermost pin, a radially intermediate pin and a radially outermost pin; the circumference of each radially intermediate pin being greater than the circumference of each radially innermost pin, and the circumference of each radially outermost pin being greater than the circumference of each radially intermediate pin. 2. The rotor as set forth in claim 1 wherein each of said pins has a generally circular cross-section. 3. The rotor as set forth in claim 1 wherein at least one of said pins has a generally elliptical cross-section. 4. The rotor as set forth in claim 1 wherein at least one of said pins has a generally oval cross-section. 5. The rotor as set forth in claim 1 wherein each of said ribs has a radially proximal end and a radially distal end relative to said central axis, each of said proximal ends being spaced equidistant from said central axis and each of said distal ends being spaced equidistant from said central axis; said pins in each of said pin clusters being spaced radially from said central axis not less than said proximal ends of said ribs and not greater than said distal ends of said ribs. 6. The rotor as set forth in claim 1 wherein said pins have a length measured along a radial direction less than twice the maximum width of an adjacent said rib measured along a circumferential direction. 7. The rotor as set forth in claim 1 wherein said radially innermost, intermediate and outermost pins in each said row of each said pin cluster are spaced equidistantly apart. 8. The rotor as set forth in claim 1 wherein each said pin cluster includes at least three distinct rows of said pins radially aligned within the respective said attenuation region. 9. A ventilated brake disc rotor for a vehicle braking system, said rotor comprising: an annular inboard friction plate having a central axis;an annular outboard friction plate spaced from said inboard friction plate and concentrically disposed about said central axis;a plurality of ribs disposed between said inboard and outboard friction plates, said ribs spaced one from another in regular circumferential increments about said central axis with a generally radially extending vent hole defined in the space between adjacent ribs;said plurality of ribs being arranged in four arcuate sectors of equal angular measure, each of said sectors containing an attenuation region in which the regular spacing of said ribs is interrupted, each said attenuation region occupying at least 20% but not more than 55% of the surface area represented by the respective said sector;a pin cluster disposed in each said attenuation region, each said pin cluster including three distinct rows of radially aligned pins; said pins disposed in-between and interconnecting said inboard and outboard friction plates, said pins in each said pin cluster being at least nine in number and spaced both radially and circumferentially from one another; andsaid three rows of pins in each said pin cluster containing an equal number of pins each having a generally circular cross-section, each said row including a radially innermost pin, a radially intermediate pin and a radially outermost pin; the diameter of each radially intermediate pin being greater than the diameter of each radially innermost pin, and the diameter of each radially outermost pin being greater than the diameter of each radially intermediate pin. 10. The rotor as set forth in claim 9 wherein each of said ribs has a radially proximal end and a radially distal end relative to said central axis, each of said proximal ends being spaced equidistant from said central axis and each of said distal ends being spaced equidistant from said central axis; said pins in each of said pin clusters being spaced radially from said central axis not less than said proximal ends of said ribs and not greater than said distal ends of said ribs. 11. The rotor as set forth in claim 9 wherein said pins have a diameter less than twice the maximum circumferential width of an adjacent said rib. 12. The rotor as set forth in claim 9 wherein said radially innermost, intermediate and outermost pins in each said row of each said pin cluster are spaced equidistantly apart.