Tech-53 4-Piston Big Brake Kit for BMW E30 Lightweight and more powerful than any other 4-piston caliper kit on the market, this system has been rigorously tested on track with stunning results. Clamping Force Comparison Stock caliper (floating type): Tech-53 = +61% Competitor 4-piston kits: Tech-53 = +45% Mazda RX-7 FC T2 caliper + adapters: Tech-53 = +36% We are the only company offering 1.625" diameter pistons, translating into more clamping pressure and balanced front-to-rear bias. No one else delivers this level of street/track performance for the E30 chassis. Forged Billet Calipers High-strength forged billet body delivers superior stopping power. Four stainless steel pistons ensure balanced pad loading, corrosion resistance, and improved heat management. Fully compatible with a 22mm master cylinder. Significant Weight Reduction Calipers weigh only 3.9 lbs each — nearly 60–70% lighter than OEM cast iron units. Rotor assembly weighs 3.83 kg vs. 5.45 kg OEM (over 32% reduction). Directional rotors (left and right) for optimized cooling and performance. 11" Two-Piece Lightweight Rotors 32% lower rotary mass compared to OEM E30 rotors. Standard Wilwood 11" rotors, available plain, grooved, or slotted/drilled. Hats are CNC-machined from aircraft-grade 6061-T6 aluminum with a black e-coat finish. Benefits of Two-Piece Rotors: Lower mass/inertia → faster braking, less fade. Reduced unsprung rotary mass → less suspension stress and gyroscopic effect. Aluminum hats dissipate heat better than cast iron, protecting wheel bearings. Fitment Minor trimming of brake backing plate required. 280mm rotors fit most 15" wheels (spacers may be required depending on wheel design). PDF wheel clearance template available – print to scale, cut, and test inside your wheel. Fits all E30 RWD chassis: 318i(s), 320i, 323i, 325i(s). A 22mm master cylinder upgrade may be required for 325ix boosters with M50/S50 swaps. Complete Bolt-On Solution (all hardware included) 2 × Wilwood 4-piston calipers with fasteners 2 × Tech-53 11" two-piece lightweight rotors 2 × Tech-53 caliper adapters (bolt onto E30 spindles, 280mm rotor configuration) 2 × Custom DOT-approved stainless steel braided brake lines (correct length, OE fitment, made in USA) 1 × Hawk Performance brake pads
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