Peugeot 106 XR humming noise in 5th gear ?

First of all, hello everyone, I am writing to the forum for the first time. My car is 1998 model Xr 262 thousand. When I have been driving long distances for the last 2 weeks, after taking a certain road, when I am in 5th gear, it seems like a vibration and annoying humming sound from the left front of the vehicle. it gets louder but when it is wasted at that moment, the sound suddenly stops. What is the reason for this? It's been 2 months since I bought the car. Can you help? I went to the industry and described the sound. No one understood the sound.

The incident you mentioned happened to me in 1st and 2nd gear. The pressure pad, crank seal and socket pole bearing were changed and the problem went away. If there is no problem with the gears, it may be caused by them.