brakes have groove & ridges in the contact surfaces maybe?
this causes a vibration, more when you are reversing, that creates the
try a couple of hard quick stops or manually remove the ridges
Most likely its coming from the rear pads. Its not abnormal for this to
happen on disc brakes. The easiest & cheapest thing to do is take out the
pads & sand them down. Then lubricate pads & sliders. Also a pretty good
idea to scuff up the disc a little.
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