AP Racing Radi-CAL Competition Front Kit 340mm - Mazda Miata, Fiat 124

The AP Racing by Essex Radi-CAL Competition Brake Kit transforms the front brakes of the ND Mazda MX-5 Miata and its sibling, the Fiat 124 Spider. It replaces the small single-piston sliding caliper and 280mm disc with AP Racing CP9449 Radi-CAL four-piston calipers and 340 x 28mm, 48-vane heavy duty J Hook discs. Essex built it for drivers pushing the ND hard on track, and it is especially suited to turbocharged and supercharged cars.

Why upgrade

The ND's factory brakes are light but small, and they run out of heat capacity fast on a road course, particularly with added power. This kit moves from a 280 x 22mm disc to a 340 x 28mm disc, a huge gain in thermal mass, yet still removes about 6 pounds of unsprung weight from the car. Each CP9449 caliper weighs 4.85 pounds versus 7.5 pounds for the factory slider. Pistons are sized for the OEM master cylinder, ABS and rear brakes, so balance stays correct.

Caliper and disc construction

The CP9449 is a radial-mount, fixed four-piston Radi-CAL caliper. Its asymmetric body is computer optimized for stiffness and finished in hard anodizing. Stainless steel pistons, anti-knockback springs and low-drag, high-temperature seals hold up to long sessions. The CP6565 heavy duty discs use 48 vanes on 6061 hard anodized aluminum hats with fully floating hardware.

Features

• AP Racing CP9449 Radi-CAL Pro5000R four-piston calipers
• 340 x 28mm, 48-vane heavy duty J Hook discs on floating hats
• About 6 lb lighter than the factory front brakes
• Ideal for high horsepower and forced induction builds
• Works with the OEM rear brakes

What's Included

• One pair AP Racing CP9449 Radi-CAL Pro5000R racing calipers
• One pair 340x28mm AP Racing CP6565 heavy duty J Hook racing discs, with fully floating 6061 hard anodized aluminum hats and attachment hardware
• One pair caliper mounting brackets and hardware
• One pair Spiegler Stainless Steel Brake Lines with abrasion resistant coating
• Detailed installation instructions

Brake pads are not included.

Specifications

Video

Fitment notes

Fits the ND MX-5 Miata, including the RF, and the Fiat 124 Spider below. OEM 17 inch wheels need a 15mm spacer; check aftermarket wheels with the wheel fitment template. Pads are sold separately.

Fitment