Grand National GN4R Caliper – Part No: 120-16529
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Grand National GN4R
Prod #: 120-16529
Price: $729.10
Available Caliper #120-16529 Configurations
Grand National GN4R - Product Summary
Caliper No: 120-16529
Wilwood Grand National GN4R Caliper Wilwood Grand National GN4R Caliper Zoom Image

Piston Count 4
Piston Area (in²) 5.18
Piston Type Thermlock
Dust Boot No
Rotor Dimensions
Rotor Width (in) 1.25
Rotor Diameter(in) 14.00
Pad Dimensions
Pad Area (in²) 11.1
Pad Volume (in³) 6.9
Duty Rating & Material
Material Aluminum
Weight(Lbs) 8.0
Colors & Finish
Color Ano
Finish Type III Ano

Mount Center(in) 7.09
Mount Position
Mount Side Left Hand
Mount Type Radial
UPC Number
UPC 889545101607
Product Documents
Product Data Sheet

Installation Instructions

WARNING: Cancer and Reproductive Harm
Applicable to Brake Pads Only

120-16529 - Product Description

Grand National GN4R

Grand National GN4R forged aluminum four-piston radial mount calipers bring current state-of-the-art design, materials, and manufacturing technology to this long standing icon in the Wilwood caliper line. With a High-strength forged aluminum body in a hard-anodized finish and Purpose built for rotors with a 1.25” thickness and a special bracket offset. Also these calipers come with Thermlock® insulated pistons.

Product Specifications

Rotor Compatibility
Rotor Width (in) 1.25
Maximum Rotor Width (in) 1.25
Minimum Rotor Width (in) 1.19
Maximum Rotor Diameter(in) 14.00
Minimum Rotor Diameter(in) 12.19

Brake Pad Specifications
Brake Pad Type 1 7520
Brake Pad Type 2 N-A
Brake Pad Type 3 N-A
Total Pad Area (in²) 11.1
Total Pad Volume (in³) 6.9
Piston Specifications
Piston 1 Bore (in) 1.88
Piston 2 Bore (in) 1.75
Piston 3 Bore (in)
Total Piston Area (in²) 5.18

Mounting Specifications
Mount Type Radial
Mount Side Left Hand
Mount Center(in) 7.09
Mount Hole Size(in) 0.45
Mount Height(in) 2.33
Inlet Thread Size 1/8-27 NPT
Pad Dimensions & Part Numbers

Pad Dimensions for the Grand National GN4R Pad Dimensions for the Grand National GN4R Zoom Image

Mount Dimensions for the Grand National GN4R Mount Dimensions for the Grand National GN4R Zoom Image
Mount Dimensions & Part Numbers

Dimensions for the Grand National GN4R Dimensions for the Grand National GN4R Zoom Image

Additional Notes

Parts & Accessories

O-Ring Kit 130-2427
Replacement Dust Boot N-A
Replacement Piston 1 200-7550
Replacement Piston 2 200-7551
Replacement Piston 3 N-A
Replacement Piston 4 N-A
Cross-Over O-Ring Kit 130-10540
Bridge Bolt Kit N-A
Wear Plate L/H 300-5922
Wear Plate R/H 300-5923
Pad Retainer N-A
Bleed Screw Kit 220-0627
Self Bleeder Tube N-A
Cross-Over Tube N-A

Additional related products:

More Details

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Version: 3.03 April 28, 2022