Wilwood Front Narrow Dynapro Road Race Brake Kit, Dynamic GT Rotors, Mazda MX-5 Miata / Fiat 124 Spider

Convert the documented Mazda MX-5 Miata / Fiat 124 Spider (2016–2025) front brake arrangement with Wilwood Narrow Dynapro Road Race calipers and gt slotted rotors. This selection has hard-anodized calipers, 4 pistons per service caliper and 11.00-inch rotor diameter, with fit determined by the installed hardware. From its base in Camarillo, California, Wilwood Engineering designs and manufactures disc-brake components and systems. Bill Wood founded the company in 1977. Motorsport, specialized applications and street-performance vehicles use its range of calipers, brake rotors, master cylinders, valves, fittings and brake lines, with component selection matched to the finished brake system.

Technical Details

• Manufacturer part number: 140-17362; supplied as an axle kit.
• Hydraulic sizing: cataloged bore sizes 1.38, 1.38 inches; piston area 3.00 square inches; inlet 1/8-27 NPT.
• Supplied friction pads: BP-40 compound; match operating conditions to the intended use.
• Brake rotor size: 11.00-inch outside diameter × 0.81-inch thickness; vented friction section.
• Rotor hats: Aluminum big brake dynamic hat - short offset; Type III Anodize; hat offset 0.750 inches. Hat offset is distinct from axle offset.
• Service calipers: Narrow Dynapro Radial Mount; 4 pistons per caliper; Type III Anodize; radial mounting; stainless pistons.
• Hydraulic lines: Braided flexlines included; verify fittings, length and routing on the actual vehicle.
• Wheel envelope: 15-inch minimum nominal wheel diameter; verify the entire wheel-clearance drawing, including spoke and barrel shape.
• Rotor specification: Material: Spec-37 Iron; Type: GT 72 Straight Vane; Style: GT Slotted; Surface Finish: Plain.
• Rotor/hat mounting-hole pattern: 4 x 3.93 in; 4 x 99.82 mm; cataloged hole clearances 0.500 in; 12.70 mm. These are rotor or hat drillings, not replacement wheel studs. The retained hub or axle determines the vehicle wheel pattern.
• Hardware and retained components: Mounting hardware supplied; existing wheel hubs retained; spindles, master cylinder and brake booster are not included.

Fitment & Compatibility

The table below separates Mazda MX-5 Miata ND and Fiat 124 Spider applications; use the exact model year and brake option. DS1554 provides the factory-upright, 15-inch-wheel and dynamic rotor-mounting arrangement. This road-race kit has BP-40 high-temperature pads; extended low-temperature operation causes premature pad and rotor wear. Confirm racing use, wheel clearance and the included line routing. This is a racing selection; review the pad operating range and maintenance requirements before use.

Send PMB Performance the VIN and the relevant brake measurements for help with selection. We have over 20 years of experience working through parts and compatibility details.

Review Installation instructions for the complete installation and clearance requirements.

Manufacturer Warning

Applicable to brake pads only. WARNING: This product can expose you to chemicals including Arsenic, Cadmium, Chromium (Hexavalent compounds), Lead, Nickel, Cobalt and Antimony Trioxide which are known to the State of California to cause cancer or other reproductive harm. For more information go to www.p65warnings.ca.gov.