Noisy Rear Brakes

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At slow speeds the rear brake is making a grumbling noise! This began last week as I was descending down a very steep and rocky hill and was traveling very slow, maybe 1-3 MPH. I isolated it to the rear brake as it did the same thing when only applying the parking brake at the same speed. I washed the rear brake area and the noise stopped for about 20 minutes and now its back again, even on level ground. But it only happens on slow speed stops.

Took the P4 in for its first service and oil change yesterday. The tech said the brake issue is common and will go away with time.

Anyone have some insight into this?

mine is making the same noise going down steep grades, sounds like the back brake rotor is chattering real bad, have you found a solution yet???? mine is getting much much worse, i"m just not sure if this is a product defect or can something be done to correct it

 

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