Quote:
Originally Posted by DougR
I would ask someone to bounce the rear bumper while I laid on the ground under the rear with the parking brake set. Touch the point of a long screwdriver to various places that are a likely source of the noise. Find a point where you feel the strongest vibration through the handle. If you are unable to feel a vibration with your hand, then hold the handle against your ear. You may also use a length of PVC pipe held against your ear and touch various points with the other end to find the loudest source of noise.
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2017 TRD Pro here. I had a squeak. If you follow the brake lines, they go through a round metal retainer which on mine, would create a slight squeak because the brake line would rub against the metal ring. I fixed mine by slight bending the ring to change the angle a bit. simple fix.
You can test before bending by just spraying a bit of lube on the line where it contacts the round metal ring. To be clear, the retaining ring, just keeps the brake line in place and allows movement/flex for rear axle.