Wilwood 120-17203-Y XRS4R Radial Mount 4-Piston Disc Brake Caliper - Yellow

The Wilwood 120-17203-Y is a XRS4R Radial Mount 4-Piston Disc Brake Caliper finished in a high-visibility yellow powdercoat. Engineered for high-performance racing and track applications, the XRS4R series features a rigid, lightweight billet aluminum body designed to minimize flex and deliver consistent, fade-resistant braking performance under extreme conditions.

Wilwood's radial mount design provides a stiffer caliper-to-upright connection compared to traditional lug-mount configurations, improving pedal feel and brake modulation. The four-piston configuration ensures even pad pressure distribution across the rotor surface for maximized braking efficiency and extended pad life.

Key Features:

• 4-piston radial mount caliper design for superior rigidity and pedal response
• Lightweight billet aluminum body construction
• High-temperature phenolic pistons resist heat transfer to brake fluid
• Stainless steel bridge bolts for long-term durability
• Dual internal fluid crossover ports for balanced pressure distribution
• High-visibility yellow powdercoat finish for easy identification
• Compatible with Wilwood's broad range of brake pads and radial mount brackets

The XRS4R is a popular choice for oval track, road racing, and performance street builds where precise brake control and lightweight construction are critical. The yellow finish (suffix -Y) allows for quick visual identification on the track or in the shop.