On its MOT a few weeks ago it needed 2 new front brake pads which were done fine, since then i've noticed a very faint soft almost squeaky ratchet sound around 80% of the time i apply the brakes, and you can only here it with the windows down, now I know new pads need a bedding in period but im way over the miles needed for that to be completed, and never had this noise on any previous car.

Also ive now noticed when parking up after a drive there's a bubbling noise which has only just started happening post MOT, which I have now traced to this, its bubbling away to the point after a drive with the engine off you can hear it inside the cabin Here's a video of the part bubbling away

the car is booked to go back to the garage (who ive had multiple dealings with in the past and been 10/10) in a day or two but this is quite concerning to someone who isnt sure what these issues exactly are, hopefully someone can help.