Mazda 3 Steering, Suspension, Brakes, Wheels & Tyres Problems

I have an annoying rattle from rear brakes. If I touch pedal or pull handbrake up slightly rattle goes away. Passed MOT like this for last 4 years. Garage has checked pads and all ok. Any ideas?

1.6d engine as focus volvo peugeot etc. accelorates fine no engine noise that isnt usual. release accelorator pedal there is a metalic/bearing type of noise.press clutch all ok thought it was from turbo but checked impellor all ok. has be...