odd brake problem

[wobbo]

hi all,

i have just noticed in the last couple of days that when i take my foot of the brakes (ford focus 1.6 climate control, petrol, 2007) i hear a quiet what sounds like a whistle for only half a second or so, seems to do it when hard or soft breaking, never heard it before the other day, the brakes feel and work fine as they always have, so thought i would ask if anyone else has ever had this on a focus or ford in general.

any ideas or advice would be great.

thanks

 

update.....

i got my daughter to stand at the side of the car and went backwards and forwards applying the brakes and the whistle/ noise is coming from the passenger side rear drum brake, so need to get that looked at, there is no heat/smell/smoke.