2014-2020 BMW M4 / Competition (F82/F83) Carbon Ceramic Brake Rotors A-Class The judder and pedal pulse

The judder and pedal pulse XF S owners report comes from iron rotors distorting under repeated heat cycling

We addressed it two ways — the low-metallic resin-composite pad compound and the disc's ceramic coating are both tuned for cold starts

The rotors are trim-specific because the W206/S206 uses different factory sizes per trim

StopFlex tunes around it — the pad compound and the disc's ceramic coating are both optimized for cold starts

You reuse those factory calipers and bolt on our carbon-ceramic discs

2014-2020 BMW M4 / Competition (F82/F83) Carbon Ceramic Brake Rotors A-Class The judder and pedal pulseReal Customer Builds & Reviews View All Will This Fit My Car? Direct Replacement CCB Discs (Retain Factory Calipers) for the 2014 2020 BMW M4 Competition (F82 F83). Factory rotor specifications and the smallest wheel that clears each trim: Trim Front Rotor (Factory) Rear Rotor (Factory) Min. Wheel Size M4 380mm, 400mm (CCB) 370mm, 380mm (CCB) 20" Keep Your Factory Calipers? The rule is simple: front factory calipers must be 4 piston or more; the rear