My 2010 GLS accent makes a poping noise when applying the brakes a low speed, the poping noise increases or decreases with speed. Only hear it when applying the brakes lightly coming to a stop. Had it in the shop, they say it's normal. Funny it just started. Any body had this problem? Thanks

 

Is it high-pitched? How frequent is the popping noise? Possible to know where the noise is coming from (ie. front, back; driver or passenger side)?