31 Flavors for 45 minutes

My sister and I was going to go to Toys 'r' us with her kids today. When we were driving to go there, we could hear some strange sound like we are dragging something under our car... This is my mom's car and she had just had changed tires or brake's, etc yesterday. We were worried about that sound so we decided to park immediately. There was 31 Flavors Ice Cream parking, so we parked there. We called our dad and he said it should be fine... but my sister decided to call "JAF" which is like AAA in USA. We had to wait for 40-50min for them to arrive, so we waited at 31 Ice Cream shop. JAF staff checked everything but said that nothing is wrong..... so we went back to house to see if it happened again and JAF staff followed us just in case - but it was fine... we could not hear that strange sound anymore....
My dad said car shop changed brake stuff so it might be that one...
Anyway, we spend wasting time today.
After we came back to the house, we went to Toysrus. Kanta really enjoyed to check their toys.