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I've noticed an intermittent clunk which occurs when engaging the hydraulics brakes during reverse maneuvers. It happens with anything from very light to very heavy brake force and typically will happen before driving very far (backing out of driveway, out of parking spot, etc) but does not happen after driving (backing INTO driveway or parking spot). This has been occurring for a while now with no other symptoms (other than some shudder during take off which I attribute to a sloppy transmission bushing).
Any ideas? Front brakes were in great shape when I r&r them a while back to turn the rotors, didn't pull the rears apart but they look good, and I don't have any brake vibrations or issues when moving forward. I can't rule out a driveline clunk or suspension clunk either but the u-joints don't have any slop in them and no squirrely handling issues either.
I had a clunk, that turned into a vibration of sorts at 20 mph. I got under and shook, pulled, kicked the driveshaft, all with a very sturn look on my face, with no budge. I went ahead and replaced the ujoints and it is gone.
My rear brakes do it too. Only once as I roll backwards out of the driveway. I think it is totally normal and only does it upon first engagement of brakes.