My 2004 v8 has recently developed a terrible screeching sound that is only really present after the car has been sitting. In particular when backing out of driveway in the morning.

I replaced front and rear pads and rotors, as well as front calipers in the fall. I did a thorough brake bleed, new HW, and cleaned/lubed everything during the brake job. Didn't have any issues until the past month or so. It sounds like the noise is coming from the front.

I was going to take a look this weekend (weather permitting) and maybe lube everything up again. It's my wife's car so I don't drive it regularly, but it seems to brake fine, no pulling or vibrations, with expected pedal feel.

Any other thoughts on what to look for? I'm hoping that maybe there is just some debris jammed somewhere that is causing the issue. Anyone else experience this?

A couple of questions. First, what kind of pads did you put in it? Some of the less expensive pads - in addition to wearing out quickly - can develop some interesting noises as they wear. Higher quality pads usually come with either a special backing pad to absorb vibration or have a coating applied directly to the back of the pads for the same purpose.

Second, check to see if a caliper may have frozen up. I know you said you replaced them, but some of the rebuilt calipers out there are just plain junk and don't last long at all. Easiest way to see if a caliper is locked up is temperature. If it's hot after a short drive and the other side is not, either the hot side is frozen with the piston extended or the cold side is frozen with the piston retracted.

Thanks for the reply. Everything was from Advance Auto, so whatever their higher end house brand is. They are not the ceramic pad/rotors, just the standard semi-metallic that was in stock. I do recall the pads having a pad on the back, but I also used caliper grease on the back of the pads, slide pins, and groove in the caliper. I'll check wear and caliper movement when I pull them off, I don't think they were re-built but might have been. But I would think if there was a frozen caliper some pulling would be noticeable during a hard brake. Everything stops as expected. Just a loud awful noise, especially first thing in the morning during backing out.

Sometimes this can be normal with moisture forming on the brake pads, particularly if its been sitting. If it goes away after driving it and no braking or driving issues it may be this

agree, here in florida during the summer i will get the squeal in the morning after the vehicle sits overnight, only happens during the summer or after i water the lawn and the vehicle gets wet. If i run ceramics then i dont experience this issue.