Wilwood 120-7737-P GP310 4-Piston Disc Brake Caliper for Harley-Davidson

The Wilwood GP310 disc brake caliper (120-7737-P) is a high-performance, billet aluminum 4-piston caliper engineered specifically for 1984–1999 Harley-Davidson motorcycles. Combining race-derived braking technology with bold, bolt-on styling, the GP310 delivers superior stopping power with a distinctive appearance suited to custom and performance builds alike.

Rear caliper fitment is available for Softail, Dyna, and Touring models, with unique bracket designs that balance structural strength and visual appeal. The caliper is offered in polished, brilliant chrome, and black finishes to complement a wide range of motorcycle styles.

Key Features:

• 4-piston billet aluminum construction for lightweight rigidity and superior clamping force
• Stainless steel pistons reduce brake fade and resist corrosion under high-heat conditions
• High-temperature piston seals for extended service life, controlled retraction, and drag-free operation
• Exclusive pad anti-rattle clip minimizes vibration and noise
• Bright-finish bleed screws and hardware for a polished, premium appearance
• Performance brake pads formulated for the widest range of temperatures and environments
• Stainless steel rotor-compatible pad formulation using Wilwood's industry-leading compound
• Available in polished, chrome, or black finish

The Wilwood GP310 caliper brings the proven performance characteristics of Wilwood's racing calipers directly to your motorcycle, making it an ideal upgrade for riders demanding reliable, fade-resistant braking with premium aesthetics.