Wilwood 120-7736-P GP310 4-Piston Disc Brake Caliper for Harley-Davidson

The Wilwood GP310 disc brake caliper (120-7736-P) is a high-performance billet aluminum caliper engineered specifically for 1984–1999 Harley-Davidson motorcycles. Designed as a direct bolt-on upgrade, the GP310 delivers race-proven braking performance with distinctive custom styling.

Built around a 4-piston design with stainless steel pistons, this caliper reduces brake fade under hard use while offering excellent corrosion resistance. High-temperature piston seals ensure extended service life, controlled retraction, and drag-free operation — performance characteristics carried over directly from Wilwood's racing caliper lineup.

Rear caliper fitment is available for Softail, Dyna, and Touring models, with unique bracket designs engineered to balance structural strength with clean aesthetics. The GP310 is offered in polished, chrome, and black finishes to suit a variety of custom and stock builds.

Key Features:

• 4-piston billet aluminum caliper construction
• Stainless steel pistons for fade resistance and corrosion protection
• High-temperature piston seals for extended life and drag-free performance
• Bolt-on fitment for 1984–1999 Harley-Davidson Softail, Dyna, and Touring models
• Available in polished, chrome, and black finishes
• Bright-finish bleed screws and hardware included
• Exclusive pad anti-rattle clip included
• Brake pads compatible with stainless steel rotors across a wide temperature range

The Wilwood GP310 is a proven solution for riders seeking race-derived braking performance in a bolt-on package that doesn't compromise on style or durability.