I have changed relatively soon the brake pads of the front wheels and also gave myself that the discs still did not need to change because they were in good condition, so I discarded that I had a relay with those pieces, although not knowing specifically the reason, nothing can be discarded.
In the workshop they told me once about the temperature, and if it were the reason, I would only have to wait for them to go down enough to check it.
Another comment mentions the Silenblocks, but I think there are several pieces that can carry some rubber or rubber and you would have to guess which one fails (forgive my ignorance if I am wrong in something, but obviously the mechanics is not mine). Thanks for your comments