Wilwood 120-16528 Grand National GN4R Four-Piston Radial Mount Disc Brake Caliper

The Wilwood Grand National GN4R is a four-piston radial mount disc brake caliper engineered for high-performance racing and demanding street applications. Built from a high-strength forged aluminum body with a Type III Mil-Spec hard-anodized finish, this caliper delivers exceptional structural rigidity, superior wear resistance in the piston bores, and outstanding resistance to abrasion and corrosion.

Radial mounting provides two planes of adjustment for precise alignment over the rotor, simplifying bracket adaptation and ensuring optimal pad-to-rotor contact. The GN4R is purpose-built to accommodate 1.25" thick rotors with a specific bracket offset, making it a targeted solution for dedicated brake system builds.

Key Features:

• Four-piston radial mount design for improved clamping force and pedal feel
• High-strength forged aluminum body construction
• Type III Mil-Spec hard-anodized finish for superior durability and corrosion resistance
• Designed for 1.25" rotor thickness with special bracket offset
• Lightweight aluminum construction reduces unsprung weight
• Part of Wilwood's Grand National GN4R caliper series

The Wilwood GN4R caliper is an ideal choice for builders seeking a precision-engineered, race-grade brake caliper with the flexibility and strength of forged aluminum construction.