Had my zed MOTed last week, sailed through with no advisories. Over the last 3 days ive noticed the brakes acting a bit strangely. As im slowing down on the brake approaching a junction/lights/standing traffic the brakes initially work as normal but as i try to press the pedal a bit more to come to a standstill the pedal wont move any further leaving me moving but needing to stop. When I release the pedal for a few seconds then depress again it repeats the same process. If i have to brake more sharply they seem to work fine. Anyone else had this or any idea what the problem could be?