Wilwood 120-10715 GP320 Billet 4-Piston Disc Brake Caliper Left-Hand

The Wilwood GP320 four-piston billet caliper (120-10715) is a compact, high-efficiency left-hand brake caliper purpose-built for lightweight open-wheel racing applications. Weighing just 1.70 lbs, this caliper delivers serious stopping power in a minimal package, offering a significant pad area upgrade over conventional two-piston calipers.

Key Features:

• CNC billet construction — Full detail machined from premium alloy billet for superior strength-to-weight ratio
• FEA-engineered design — Finite Element Analysis used to minimize weight while maximizing structural rigidity against deflection
• Four 1.25" stainless steel pistons — Even clamping force distribution across the full pad length minimizes backing plate deflection and promotes uniform pad wear
• Rotor compatibility — Accommodates rotors .75"–.81" thick with overall diameters from 9.00" to 11.50"
• Four high-strength steel cross bridge bolts — Corrosion-coated full-width bridge bolts resist deflection and body separation under extreme load
• Internal fluid ports with single outboard bleeder — Enables quick and effective evacuation of gases and spent fluid
• Wilwood Type 6211 brake pad compatible — Pads measure .44" (11.2mm) thick × 2.74" (69.6mm) long, representing nearly a 50% increase in pad area over comparable two-piston designs
• High-temperature square-faced bore seals — Wide sealing area with positive piston retraction upon release
• Quick-Clip retention pins — Allow easy pad service and replacement without caliper removal
• Type III hard anodized finish — Maximum corrosion and element resistance
• Stainless steel pistons — Resist corrosion and retard heat transfer from brake pad to caliper body, seals, and fluid

The GP320 is ideally suited for karts, motorcycles, mini-sprints, formula sports racers, and other lightweight open-wheel racing applications. Wilwood Type 6211 brake pads are available in a wide range of compounds — from street to extreme high-temperature race formulations — delivering predictable engagement, high friction, long wear, and superior fade resistance in demanding conditions.

This listing is for the left-hand (LH) caliper. Caliper mounting and hardware sold separately.