Wilwood 120-16460 XRZ4R Radial Mount Brake Caliper, Right, 4-Piston

XRZ4R Radial Mount

Wilwood’s next-generation XRZero brake calipers combine decades of racing experience, computer finite element analysis (FEA), and state-of-the-art machining to create a lighter, stiffer caliper, with zero drag. Its unique high-surface body shape creates a caliper with superior brake fluid cooling and allows for increased airflow through the rotor. Optimized profile high-temperature seals provide improved piston retraction, reducing drag. The exclusive central X-bridge reinforces the caliper body without adding mass or obstructing airflow to the rotor or brake pads.

Computer FEA design and precision CNC machining of the stress-flow forged aluminum body result in a caliper weighing only 4.66 pounds (2.11 kg), 1/2 pound (227 grams) less than a comparable size Wilwood Superlite caliper. The innovative complex body shape removes unnecessary bulk, improves brake and fluid cooling, and reduces deflection. Four Thermlock® thermal barrier pistons reduce heat transfer to the brake fluid, with front calipers featuring stepped bores providing more even engagement with improved pad wear. Hard-anodized in the piston bores and surface with a Type III aluminum oxide ceramic finish for durability, and equipped with single-point bleed technology and low-profile bleed screws for easy maintenance. Friction-free pad retention pins (spare included) hold your choice of Wilwood’s .80” thick racing compound brake pads, for extended life. id="MainContent_lblPistType" class="Gray11B">Thermlock Dust Boot No

Rotor Dimensions

Rotor Width (in)	0.81
Rotor Diameter (in)	14.00

Pad Dimensions

Pad Area (in²)	8.2
Pad Volume (in³)	4.9

Service Rating and Material

Material	Forged Aluminum
Weight (lbs)	5.2

Colors & Finishes

Color
Finish	Type III Anodized

Mounting

Mounting Center (in)	5.98
Mounting Position
Mounting Side	Left
Mounting Type	Radial

Specifications

Rotor Compatibility

Rotor Width (in)	0.81
Max Rotor Width (in)	0.90
Min Rotor Width (in)	0.75
Max Rotor Diameter (in)	14.00
Min Rotor Diameter (in)	11.75

Brake Pad Specifications

Brake Pad Type 1	10420
Brake Pad Type 2	N-A
Brake Pad Type 3	N-A
Total Pad Area (in²)	8.2
Total Pad Volume (in³)	4.9
Mounting

Piston Specifications

Piston Diameter 1 (in)	1.88
Piston Diameter 2 (in)	1.75
Piston Diameter 3 (in)
Total Piston Area (in²)	5.18

Mounting Specifications

Radial

Mount Side	Left
Mount Center (in)	5.98
Mounting Hole Size (in)	0.39
Mount Height (in)	1.63
Inlet Thread Size	3/8-24