A modern lightweight forged aluminium brake caliper designed to directly replace the original M type calipers on classic Porsche 911 models. The D31 caliper uses stainless pistons with dust boots, weighs just 1.86kg, and works with the factory discs, pads, lines and master cylinder for a simple, high-performance upgrade.Here s a detailed look at the key technical features, and the practical benefits they offer:Lightweight forged aluminium body: Made using a precision forging process that produces a high-strength yet low-weight structure, helping to reduce unsprung mass and improve the car s response to road inputs.Direct replacement fitment for 3.00 bolt spacing: Engineered to bolt directly to classic 911 uprights that originally used M type calipers, making installation straightforward without modification and ensuring proper alignment and geometry.Retains OEM discs, pads and brake lines: Compatible with original factory hardware including the master cylinder, eliminating the nee