EBC GD485 3GD Series Dimpled and Slotted Sport Brake Rotors

The EBC GD485 is part of EBC's 3GD Series — a premium line of dimpled and slotted sport brake rotors precision-machined from high-quality G3000 grey iron castings. Designed for drivers who demand improved braking performance without sacrificing street reliability, these rotors deliver measurably lower operating temperatures and enhanced stopping power over standard OEM-style rotors.

Wide-Aperture Cooling Slots

The GD485's wide-aperture slots actively draw cool air beneath the brake pad and rotor interface, helping manage pad contact temperatures that can exceed 1,000°F under heavy braking. This active cooling has been shown to reduce brake temperatures by up to 100°F compared to non-slotted rotors, directly reducing the risk of brake fade and loss of braking effectiveness.

EBC's Original Dimple-Drilled Design

EBC pioneered the dimple-drilled rotor in the 1990s as a superior alternative to through-drilled designs. Unlike full drill-through holes — which are known to create stress fractures — the blind-drilled dimple pattern allows brake pad gases to escape during hard braking without compromising rotor structural integrity.

Key Features:

• Dimpled and slotted design for combined pad degassing and active cooling
• Wide-aperture slots reduce brake temperatures and resist fade
• Full-sweep slots clear dust, debris, and water from the braking surface
• Slots maintain flat, parallel pad wear for consistent braking contact
• Precision-machined from high-quality G3000 grey iron castings
• 100% runout, metallurgy, and dimensional inspection before release
• Silver corrosion-resistant finish protects off-brake rotor surfaces
• Passed European R90 brake safety testing standards
• Directional design — sweeping grooves and dimple pattern must face rearward on the vehicle
• Sold as a pair

Quality and Construction

Every EBC GD series rotor undergoes a 100% runout and dimensional check, and all USA sport rotors are slotted in-house at EBC's facilities. Each rotor is balanced and runout-inspected before release, ensuring consistent, reliable performance right out of the box.

Note on Noise: As with all slotted rotors, the GD series produces increased air noise as the rotor passes beneath the brake pads during normal driving. Drivers preferring a quieter option should consider EBC's USR Sport Rotor series, which offers similar performance at a significantly reduced noise level.