Wilwood has introduced an extensive range of new braking solutions for the 1971–1991 Chevrolet K5 6-lug 4x4 platform, including two kit configurations designed for the New Big Ford 9-inch differential with a 2.50-inch offset. Additional rear OE replacement options allow builders to retain the factory-style internal drum parking brake or upgrade to Wilwood’s advanced Electric Parking Brake (EPB) system, which includes a dedicated ECU, wiring harness, remote switch, and connectors.
These big brake kits significantly increase thermal capacity and are ideal complements to upgraded wheels, tires, and suspension components. Front rotor sizes range from 12.19 to 15.00 inches, with 14.00-inch options available for the rear. Rotors are available in E-coated GTB slotted or SRP drilled-and-slotted configurations to match both performance and aesthetic preferences.
Wilwood’s high-performance six-piston Superlite FNSL6R and Aerolite AERO6 calipers are engineered for the front axle, while the rear utilizes matching four-piston options plus the proven Dynalite series, to ensure balanced and bias-correct braking performance. When using the FNSL6R front kits with OE pedal and booster, Wilwood strongly recommends their 15/16” bore Master Cylinder (P/N 260-18184) specifically designed to normalize brake function. All calipers are available in gloss red or black powder coat, with additional colors offered for an added charge.
Every kit ships with Wilwood’s street-performance BP-10 brake pads, with multiple alternative compounds available to suit specific driving demands. Stainless steel Flexline hose kits are available separately by application.
Additional fitments include Chevy K10, GMC K15 and K1500 platforms. Check the product pages for vehicle compatibility or use our Y/M/M lookup tool. Pre-sale data sheets cover modifications and application recommendations that may vary by kit.
MSRP: FNSL6R 12.19" Front starts at $1,539.65.
MSRP: AERO6 15.00" Front starts at $3,467.51
MSRP: FNSL4R 12.88" with EPB Rear starts at $3,820.29
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