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PRODUCT DESCRIPTION
Product details
Grand National GN4R
Grand National GN4R four piston radial mount brake calipers bring the latest in design, material, and manufacturing technology to this iconic and long-standing caliper line in the Wilwood product offering. Built from high-strength forged aluminum with a hard-anodized finish and specifically designed for 1.25” thick brake rotors and a special offset mounting bracket. These calipers also include Thermlock® insulated pistons.
Pistons
| Number of Pistons | 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 |
Service Rating and Material
| Material | Forged Aluminum |
| Weight (lbs) | 8.0 |
Colors and Finishes
| Color |
| Finish |
Type III Anodize |
|
Mounting
| Mounting Center (in) | 7.09 |
| Mounting Position | |
| Mounting Side | Left |
| Mount Type | Radial |
Specifications
Rotor Compatibility
| Rotor Width (in) | 1.25 |
| Max Rotor Width (in) | 1.25 |
| Min Rotor Width (in) | 1.19 |
| Max Rotor Diameter (in) | 14.00 |
| Min 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 |
| Mount |
Piston Specifications
| Piston Bore 1 (in) | 1.88 |
| Piston Bore 2 (in) | 1.75 |
| Piston Bore 3 (in) | |
| Total Piston Area (in²) | 5.18 |
Mounting Specifications
| Mount Side | Left |
| Mount Center (in) | 7.09 |
| Mount Hole Size (in) | 0.45 |
| Mount Height (in) | 2.33 |
| Inlet Thread Size | 1/8-27 NPT |
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Shipping to Spain and Europe, in 5-7 days.
Experts by your side
Over 10 years in the automotive world.
Verified parts
Each reference designed for competition.
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