I have recently changed my brake calipers, discs and brake pads on the front of my e46 320ci m sport convertible. Since i've had them done i seem to be hearing a ticking noise when i drive around 30 mph upwards. The faster i go, the louder and faster it ticks but when i apply the breaks it stops. I have tried changing my brake pads for the second time as a garage told me my pads may be moving around in the caliper. After changing the pads, it stopped for about a week and now its back. Anybody have any idea what it could be. All the parts are new from german, swedish and french ltd.