Hi I have 2012 micra got new front brake pads ans discs. When I break to stop my car there’s a sound like a echo/judder sort of sound. Only happens when I break to stop. If I slow down car is fine. Took it to two different mechanics who are saying it’s normal but it isn’t the car shouldn’t make a sound when I’m breaking to stop! Kwik fit greased it but it’s the same noise. Can someone pls help!!