Essex-AP Racing 2-piece Competition J Hook Disc - Pair - Acura integra Type-S DE5 & Honda Civic Type-R FK8 FL5

Essex Designed AP Racing 2-piece Competition J Hook disc pair for front Civic Type-R FK8 FL5 and Acura Integra Type-S DE5

• Works with OEM front calipers, no modifications required
• 13.78"" x1.4" (350mm x 34mm) 72 Vane, D66
• Huge increase in airflow, cooling capacity, and durability vs. OEM
• Designed for: Club racing, time trial, AutoX, HPDE
• Ultralight, fully floating, anodized billet aluminum hat with float control/anti-rattle clips

AP Racing J Hook Discs are the epitome of endurance racing components. They will hold up extremely well to any abuse you plan to throw at them. These discs have been proven time and again in professional racing, winning many races and championships (ALMS, Rolex, Grand Am, etc.).

Two-piece Floating Design with Aluminum Hat

As is the case with most metal, iron brake discs grow substantially when heated. As it is heated, a disc expands radially, increasing in diameter and circumference. One-piece disc designs run into problems when this occurs. Look at the picture below and imagine the disc is being heated on the track. As the disc expands, the outer edges of the disc are pulling away from the center of the disc, but there are no built-in provisions to allow for that expansion. The edges of the disc therefore pull, lift, and distort, which is called coning. Now imagine that disc vertical on the car, running in your caliper. Coning directly impacts the brake pads’ contact with the disc, leading to uneven wear and tapering, and even a long brake pedal.

Two-piece discs on the other hand, compensate for the expansion of the disc as it heats. This is accomplished by building ‘float’ into either the disc itself, or the disc hat/bell. In this case, the float is in the disc. If you look closely at the picture below, you can see that the mounting holes for the hat attachment bobbins are not round. They are an oblong shape. These channels allow the hat mounting hardware to slide as the disc is heated and expands, allowing the disc to run true in the caliper without distortion. That means less distortion, stress cracks, and pad taper.