Might be a silly question but, do all the brakes come on at the same time?

Reason being I have an annoying squeak whilst the car moves along but disappears when I apply the brakes so I'm assuming something is not quite clearing the disc hence the squeak. It appears to be louder on the drivers side so was wanting to narrow down whether front or back wheel is the more likely culprit before getting the tools out.

if that makes sense...or is it something else more expensive...

Typically a rear brake caliper piston sticking - can be rebuilt with new piston / seals if the bore isn’t too bad but they’re cheap & simple enough just to replace 👍 Jonathan

2007 Defender 90 XS Hardtop