I have noticed that when I apply brakes a squeaking sound seems to be coming out from the back

Hello,

It sounds like the rear pads are worn.
On the pads there are metal tabs that come in contact with the rotor to make the noise. This is an indicator that the pads are worn and need replacing.

Keep in mind it is important to check the rotor and make sure they are within specification and replace if necessary.

You might find this article helpful:

https://www.2carpros.com/articles/how-to-replace-rear-brake-pads-and-rotors

I have attached diagrams for your reference.

Please let me know if you have any questions.
Thank you.