GP320 Caliper – Part No: 120-15753
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GP320 Caliper
Prod #: 120-15753
Price: $212.01

GP320 Caliper - Product Summary
Caliper No: 120-15753
GP320 Caliper

Pistons
Piston Count 4
Piston Area (in²) 2.46
Piston Type Stainless
Dust Boot No
Rotor Dimensions
Rotor Width (in) 0.81
Rotor Diameter(in) 11.50
Pad Dimensions
Pad Area (in²) 3.65
Pad Volume (in³) 1.03
Duty Rating & Material
Material Billet Aluminium
Weight(Lbs) 2.1
Colors & Finish
Color Anodize
Finish Type III Anodize

Mounting
Mount Center(in) 3.50
Mount Position
Mount Side Universal
Mount Type Lug
UPC Number
UPC 889545092172
Product Documents
Product Data Sheet

Click To Download
Installation Instructions




WARNING: Cancer and Reproductive Harm
www.P65Warnings.ca.gov
Applicable to Brake Pads Only

120-15753 - Product Description

GP320 Caliper

The Wilwood GP 3230A billet four piston caliper is a compact, high efficiency performer. Weighing just 1.70 pounds, it was purpose built as an upgrade with increased pad size over two piston calipers on lightweight open wheeled racecars. Newly updated to a dual bleeder design, the caliper can now be installed both left hand and right hand inclinations. The GP 320A is also well suited for racing applications including karts, motorcycles, mini-sprints, and formula sports racers. The GP 3230A bridge configuration will accommodate rotors between .75" and .81" thick, with overall diameters between 9.00" and 11.50".

Caliper is full CNC detail machined from premium alloy billet. FEA structural analysis technology was employed to develop a design that minimizes weight and maximizes rigidity against deflection. Full width bridges are reinforced with four, high strength steel cross bridge bolts. The cross bridge bolts are coated for corrosion resistance and provide added resistance to deflection and body separation under high loads. Internal fluid ports with a single outboard bleeder provide quick and effective evacuation of gasses and spent fluid.

Clamping force is generated by four, 1.25" diameter, stainless steel pistons. The clamping force is spread evenly over the length of the pad to minimize backing plate deflection and promote balanced pad wear. The overall piston bore area provides an increase in clamping force over similar range two piston calipers. Stainless steel is used to resist corrosion and retard the heat transfer from the brake pad to the caliper body, seals, and fluid.



Product Specifications

Rotor Compatibility
Rotor Width (in) 0.81
Maximum Rotor Width (in) 0.81
Minimum Rotor Width (in) 0.75
Maximum Rotor Diameter(in) 11.50
Minimum Rotor Diameter(in) 9.00

Brake Pad Specifications
Brake Pad Type 1 6211
Brake Pad Type 2 N-A
Brake Pad Type 3 N-A
Total Pad Area (in²) 3.65
Total Pad Volume (in³) 1.03
Mount
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 Lug
Mount Side Universal
Mount Center(in) 3.50
Mount Hole Size(in) 0.39
Mount Height(in) 1.63
Inlet Thread Size 1/8-27 NPT
Pad Dimensions & Part Numbers
Pad Dimensions for the GP320 Caliper Pad Dimensions for the GP320 Caliper Zoom Image
Axle Set P/N
Pad Type
Compound
Non-Bedded Pads - by Compounds
150-28-6211K
6211
BP-28
150-40-6211K
6211
BP-40
150-13335K
6211
Purple
Mount Dimensions & Part Numbers

Dimensions for the GP320 Caliper Dimensions for the GP320 Caliper Zoom Image

Additional Notes

The GP 320 uses Wilwood type 6211 brake pads. The pads measure .44" (11,2mm) thick with an overall length of 2.74" ( 69,6mm). This represents nearly a 50% increase in pad area over some of the popular two piston calipers used on similar applications. The 6211 pad is available in many different compounds from street to high temperature race uses which provide predictable engagement, high friction, long wear, and extreme high temperature fade resistance in the harshest conditions.

Other Wilwood performance enhancements include high temperature square faced bore seals that provide a wide sealing area with positive piston retraction on release. Quick-Clip retention pins provide easy access for pad service without caliper removal. The calipers are finished in Type III hard anodizing for protection against corrosion and the elements.


Parts & Accessories

O-Ring Kit 130-3602
Replacement Dust Boot N-A
Replacement Piston 1 200-8488
Replacement Piston 2 200-8488
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 N-A
Wear Plate R/H N-A
Pad Retainer 180-3861
Bleed Screw Kit 220-0627
Self Bleeder Tube N-A
Cross-Over Tube N-A
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Version: 3.05 June 23, 2023