peugeot 205 gl incoming motion

I use 1992 model peugeot 205 gl. For the past 3 days, when I pressed the brakes hard while on the move, there is a click under the car. In the last 1 day, he started to come without pressing. The problem may be related to what. I would be glad if you could help

it may be related to the exhaust system or something is shaking

I will show the master tomorrow but when I call the master he said it might be related to the axles.

The last message and the first message describe different problems, as if the first one hits the bottom of the vehicle as one of the exhaust tires is broken, the other high-pitched sound makes it rub against the pads and turns smoothly.

I hope it is easily corrected because it started to sound very disturbing