Wilwood Forged Narrow Superlite 4R Big Brake Rear Kit | GM C10/GM C15 75-86 (140-10093-DR)Wilwood Forged Narrow Superlite 4R Big Brake Rear Kit Part #: 140 10093 DR Overview The Wilwood Forged Narrow Superlite 4R Rear Kit is a high performance braking solution designed for muscle cars and custom street machines that require a reliable rear disc brake upgrade with parking brake capability. Crafted with precision, this kit combines forged four piston calipers, two piece rotors available in 13" or 14" diameters, and high performance BP 10