Brake Kit Rear Inboard XRZ Titanium

The Wilwood Brake Kit Rear Inboard XRZ Titanium (MPN 140-17792) is a purpose-built braking system engineered for high-performance sprint car competition and advanced off-road applications where thermal management and weight reduction are critical. This rear inboard brake kit combines a forged narrow superlite six-piston caliper with a 12-inch slotted titanium rotor, delivering the stopping power and fade resistance required during sustained hard braking events. The kit includes a gray anodized aluminum sprint car hat with 3x46 spline design, ensuring secure mounting and reliable engagement under extreme load cycles.

The six-piston caliper design distributes clamping force evenly across the rotor surface, minimizing pad wear variation and maximizing brake modulation during trail-braking maneuvers. Titanium rotor construction offers significant weight savings over conventional iron rotors while maintaining superior heat dissipation properties—essential when operating in environments with repeated high-speed deceleration cycles. The slotted rotor design promotes consistent fluid film between pad and rotor surface, reducing brake fade during prolonged hard stops. At 15.33 lbs, this complete rear inboard assembly keeps unsprung mass to a minimum, directly improving suspension responsiveness and overall vehicle dynamics on the track or trail.

This kit is specified for sprint car applications and advanced motorsports platforms where inboard rear brake mounting is standard—particularly relevant for drivers who demand precision stopping performance without excessive weight penalty. The titanium construction and narrow superlite configuration reflect Wilwood's competitive heritage in circle-track racing and off-road competition. Installers should verify fitment to vehicle architecture before purchase, as inboard brake systems require specific frame geometry and cooling routing.

Wilwood manufactures this brake kit to OEM specifications for platforms that integrate rear inboard braking as a factory or race-spec option. The gray anodized aluminum hat provides corrosion resistance in high-humidity environments, while the 3x46 spline coupling ensures repeatable engagement with matched driveline components. Brake fluid, bleed procedures, and suspension geometry considerations should follow the vehicle manufacturer's technical guidelines and applicable motorsports regulations.