回複：求助：踩刹車時聽見刺耳的摩擦聲是什麽問題？

This is what you need to do: take out the brake pads, clean them out. Put some untisqueaking lube on the back of the pads and put them back on. If this did not solve the problem, then the pads(cheap metalic) or rotor needs to resurface or change.