Wilwood 120-15566 SI Billet Narrow Dynalite 4-Piston Universal Radial Brake Caliper

Billet Narrow Dynalite Radial Mount Caliper

Wilwood’s prestigious DynaLite calipers are used in every form of racing, and the latest Billet Narrow Dynalite Radial (NDLR) mount series is better than ever. Weighing in as light as 3.20 pounds (1.45 kg), this compact and lightweight caliper now incorporates a stiffer radial mount design. Engineered with a spacer-less body specifically for 0.38”, 0.810”, and 1.00” wide discs, and a central bridge bolt that increases overall caliper strength and positive top-load pad retention. A durable Mil-Spec Type III (hard ceramic) aluminum oxide hard-anodized finish further enhances the caliper's durability by resisting bore wear and surface abrasion.

Billet NDLR calipers can be direct mounted on studs with 4.75” (12 cm) on-center spacing, or used with a radial mount bracket kit in place of a tab mount caliper.

Internal dampening springs, internal fluid crossover, controlled retraction internal seals, and 3/8” cross bolts for increased strength and rigidity all combine for a consistent pedal feel from beginning to end. It uses 7816 type brake pads with many Wilwood compound choices to fine-tune your driving style and track conditions. The Billet NDLR caliper is compact, lightweight, and rugged, providing strong clamping force from its four stainless steel cup pistons. The bodies are fully CNC machined from solid stock, with internal fluid ports that eliminate external fluid tubes. Each caliper is equipped with two corner bleeders and external inlets in the proper location for standard internal mounting. Bridges are fitted with stainless steel anti-rattle wear plates. These plates reduce wear on the bridges and provide smooth, rattle-free pad operation. A central bolt in the bridge increases overall caliper strength and positive top-load pad retention. All Billet NDLR calipers are designed for long service life using the 0.63” (16.0 mm) thick 7816 style brake pads. These pads are available in a variety of PolyMatrix compounds to provide the correct braking torque and temperature range for any high-performance or competition application. Radial mount bracket kits are used to install a radial mount brake caliper in place of a tab mount brake caliper. Brackets are available for Sprint and Midget Inboard and Dirt Late Model applications for various rotor diameters.

Pistons

Piston Quantity	4
Piston Area (in²)	4.12
Piston Type	Stainless
Dust Boot	No

Rotor Dimensions

Rotor Width (in)	0.81
Rotor Diameter (in)	12.19

Pad Dimensions

Pad Area (in²)	6.36
Pad Volume (in³)	3

Service Rating & Material

Material	Billet Aluminum
Weight (lbs)	3.7

Colors and Finish

Color	Anodized
Finish	Type III Anodized

Mounting

Mount Center (in)	4.75
Mounting Position
Mount Side	Universal
Mount Type	Radial

Specifications

Rotor Compatibility

Rotor Width (in)	0.81
Max Rotor Width (in)	0.81	Min Rotor Width (in)	0.75	Max Rotor Diameter (in)
Min Rotor Diameter (in)	11.75

Brake Pad Specifications

Brake Pad Type 1	7816
Brake Pad Type 2	7216
Brake Pad Type 3	N-A
Total Pad Area (in²)	6.36
Total Pad Volume (in³)	3
Mounting

Piston

Specifications

Piston Diameter 1 (in)	1.62
Piston Diameter 2 (in)	1.62
Piston Diameter 3 (in)
Total Piston Area (in²)	4.12

Mounting Specifications

Mount Type	Radial
Mount Side	Universal
Mount Center (in)