so, I had my truck in and the mechanic said he would adjust the rears -- not sure if he actually did it since he didn't charge for it (and who works for free)
Well, the other day, I went through the car wash and when pulling away, a real high pitch sound came from the rear, but the brakes weren't on.
noise for a few seconds, and then went away.
then today, after braking for a light (not a hard or even full stop) right after, same high pitched noise -- then went away after 5 seconds.
Seems like somethings binding.
I wonder if it's the parking brake, since un shut down, I always go to nuetral, the apply parking brake, and then shift to park.

 

Either that or some brake dust is causing your squeal. Sometimes car washes help a squeal, and other times it makes it worse. I know if I'm washing a vehicle with a pressure washer I blow out the calipers the best I can.


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Springs might be getting weak. Maybe if the guy did adjust them out, he might of went to far and they rubbed and got heated up to where they glazed and now squeak. First guess would be brake dust though, I just tore my drums off last weekend and there was a pile of dust in them.