FNSL4R Caliper – Part No: 120-12602
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Forged Narrow Superlite 4 Radial Mount
Prod #: 120-12602
Price: $547.39

Forged Narrow Superlite 4 Radial Mount - Product Summary
Caliper No: 120-12602
Wilwood Forged Narrow Superlite 4 Radial Mount Caliper Wilwood Forged Narrow Superlite 4 Radial Mount Caliper Zoom Image

Piston Count 4
Piston Area (in²) 2.46
Piston Type Thermlock
Dust Boot No
Rotor Dimensions
Rotor Width (in) 1.10
Rotor Diameter(in) 14.00
Pad Dimensions
Pad Area (in²) 8.2
Pad Volume (in³) 3.8
Duty Rating & Material
Material Aluminum
Weight(Lbs) 5.0
Colors & Finish
Color Ano
Finish Type III Ano

Mount Center(in) 5.98
Mount Position
Mount Side Universal
Mount Type Radial
UPC Number
UPC 889545085860
Product Documents
Product Data Sheet

Click To Download
Installation Instructions

WARNING: Cancer and Reproductive Harm
Applicable to Brake Pads Only

120-12602 - Product Description

Forged Narrow Superlite 4 Radial Mount

FNSLR/ST forged billet calipers, with four Thermlock pistons, deliver championship proven performance with piston sizes to provide matched rear braking bias for use with the Aero6/ST or other larger piston front calipers. FNSL4R/ST calipers incorporate race technology into a radial mount body design with widespread adaptability. Including competition update options for all FNSL4R rear Big Brake kits. Thermlock pistons, high-temp seals, SRS bridge plates, and two-piece bleed screw assemblies are standard in all calipers. Four high-temp race only brake pad compounds in the 7416 pad type allow precise tuning of the brake response, friction requirements and temperature range.

The key to the superior performance of the FNSL4R comes from the extremely durable and efficient body design. Starting at 4.9 pounds it is the product of computer generated solid modeling and FEA stress analysis technology. The most noteworthy feature of this new caliper design is the forging. Each body is stress-flow forged from premium grade aluminum alloy billets. Stress-flow forging re-aligns the metal's internal grain structure to flow within the contour of the caliper body. This process eliminates the stresses and interruptions to the internal grain structure that occur when machining a straight block billet. Simply stated, there is no better way to build a stronger aluminum caliper body.

Available in diiferent piston bore sizes, provides braking as either a front or rear caliper. FNSLR/ST calipers are upgraded with Wilwood's exclusive Thermlock pistons. This multi-part piston design creates a highly efficient thermal barrier to further reduce heat transfer from the pads to caliper body, seals, and fluid. Cooler temperatures translate to longer service life and less chance for heat induced pedal fade.

Product Specifications

Rotor Compatibility
Rotor Width (in) 1.10
Maximum Rotor Width (in) 1.10
Minimum Rotor Width (in) 1.00
Maximum Rotor Diameter(in) 14.00
Minimum Rotor Diameter(in) 11.75

Brake Pad Specifications
Brake Pad Type 1 7416
Brake Pad Type 2 N-A
Brake Pad Type 3 N-A
Total Pad Area (in²) 8.2
Total Pad Volume (in³) 3.8
Piston Specifications
Piston 1 Bore (in) 1.25
Piston 2 Bore (in) 1.25
Piston 3 Bore (in)
Total Piston Area (in²) 2.46

Mounting Specifications
Mount Type Radial
Mount Side Universal
Mount Center(in) 5.98
Mount Hole Size(in) 0.39
Mount Height(in) 1.45
Inlet Thread Size 1/8-27 NPT
Pad Dimensions & Part Numbers

Pad Dimensions for the Forged Narrow Superlite 4 Radial Mount Pad Dimensions for the Forged Narrow Superlite 4 Radial Mount Zoom Image

Mount Dimensions for the Forged Narrow Superlite 4 Radial Mount Mount Dimensions for the Forged Narrow Superlite 4 Radial Mount Zoom Image
Mount Dimensions & Part Numbers

Dimensions for the Forged Narrow Superlite 4 Radial Mount Dimensions for the Forged Narrow Superlite 4 Radial Mount Zoom Image

Additional Notes

In addition, each FNSL4R is equipped with SRS bridge plates. SRS plates eliminate all bridge wear caused by pad gouging and extend the service life of the caliper. The spring-loaded action of the SRS plates also eliminates pad rattle and dampens the harmonic vibrations that contribute to pad squeal. Two piece bleed screws on each end and internal fluid crossovers prevent damage from track debris and other potential damage sources. High temperature, square faced bore seals provide the largest possible sealing area and controlled piston retraction on release. The full range of Wilwood pad compounds is available to match the brake response and heat range of any competition or sports driving application.

Parts & Accessories

O-Ring Kit 130-2479
Replacement Dust Boot N-A
Replacement Piston 1 200-11343
Replacement Piston 2 200-11343
Replacement Piston 3 N-A
Replacement Piston 4 N-A
Cross-Over O-Ring Kit 130-10540
Bridge Bolt Kit 230-7710
Wear Plate L/H 300-6596
Wear Plate R/H 300-6595
Pad Retainer N-A
Bleed Screw Kit 220-0627
Self Bleeder Tube N-A
Cross-Over Tube N-A
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All images shown are for illustrative purposes only. Actual product received may be different than what is portrayed on the web site.
Wilwood makes every effort to maintain our web site to ensure the accuracy of prices and product information. However, product information and prices are subject to change without notice. Please call (805) 388-1188 before ordering to verify current prices and product information.
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Version: 3.04 June 2, 2022