車頭有聲响

有可能是車頭內發電機或空調皮帶跟飛輪打滑所發出的聲音，原因乃當你開始發動引擎時，車頭內所有皮帶剛開始轉動，但因皮帶跟飛輪接合不緊而有虛位導至打滑空轉，這是皮帶跟飛輪磨擦所發出的吱吱聲，而車行駛時，皮帶已跟飛輪接合 (但其實還是有空轉的，因皮帶跟飛輪沒有緊密接合)，所以沒有太明顯的吱吱聲 (其實還有少許吱吱聲的)。而打滑的原因大多是皮帶上的齒條損耗或飛輪調較螺絲移位所致，建議你到車房檢查車頭內所有皮帶有沒有損耗或鬆動。

波箱皮帶問題

皮帶鬆了...去車房整啦

are you still in D波 and stepping on the brake?
if so, that should be the brake.
check brake pad, brake fluid then.

if you would like to prove whether the brake goes wrong:

a normal stopping, push to P波, pull the handbrake up and step out of brake pedal,
any noise?

or just push to P波 and release the brake,in which, P波 will lock up the car from rolling
any noise so far?
(don't do this usually as this may damage the gearbox by the way)