Thumping Sound when braking

My car wasn't used for around 3 to 4 weeks durning the lockdown. Although it started fine the brakes briefly felt kind of binded, but they quickly loosened off as I began to drive. However the car is making a kind of of low noise thumping and grinding sound, possibly from the wheels when I apply the brakes. I thought it would dissapear once I'd driven it around town a few times. I don't use the car a huge amount, but the noise has remained the same. Any help would be appreciated as to what might be causing this.