Sounds like they might have used higher quality brake pads than what came on the car originally. Most dealers do not use original brake pads from the manufacturer because of the high cost unless they are repairing something under warranty. They can buy higher quality parts at a lower price locally, but in general, the higher the quality, the more likely they are to squeal. That is different though than a grinding sound.
If they machined your brake rotors to save you money, there could easily have been large rust spots on the back side that weren't affecting the braking before, but after the machining, more of that rust could be hitting the pads. That CAN make it sound like the front end is going to fall off! The cure for that is to just buy new rotors. Fortunately, rotors like yours that used to cost around $100.00 each 20 years ago cost WAY less today.
If the mechanic doesn't see large rust pits, or a ridge of rust on the inner or outer edges of the braking surfaces, they may have to try less expensive, softer brake pads. Those rust ridges I'm referring to sometimes get missed during the machining process, but they wear down after a few days and don't cause a problem after that.
If the guys rode with you and heard the noise, they should be able to determine the cause and correct it. Very often those noises will show up when running the car in gear with it up on a hoist.
Wednesday, June 8th, 2011 AT 12:44 AM