i own a 95 ford probe se. everytime i slighty apply the brakes they squeak, then when i apply more pressure they dont sqeak, then i apply even more and they sqeak again. i checked my front brakes and the pads are good. i tried to check the back drum brakes but the cap that is held in by 2 screws would not come out....well, i took it in and have the back shoes changed and they said they had to machine the drums, costing 120.00, is that right?? any input would be appreciated........thanx