A pulsing brake pedal on a Geometry M6 is often caused by uneven brake disc friction, pad deposits, or a sticking caliper. Here’s what to check first and when to stop driving.
What you're feeling, and why it usually happens
A brake pedal that pulses or kicks back under braking is a classic sign of uneven friction at one or more wheels. On a Geometry M6, the most common culprit is the front brake discs/rotors — but “warped discs” is often a loose description. In many cases the real issue is uneven pad material transfer, rust patches, or disc thickness variation (DTV), not a bent piece of metal. EVs like the M6 use regenerative braking a lot, so the friction brakes may be used less and can develop rust or deposits if the car sits or does mostly gentle stops.
Other possible causes include: sticking caliper slide pins or pistons; a caliper that isn’t releasing evenly; worn control arm bushings, tie rods, or wheel bearings letting the hub/rotor move; a bent wheel or tyre issue; or an ABS wheel speed sensor/tone ring problem. Rear brakes can also cause pulsation, though it’s usually felt more in the seat than the steering wheel.
