can't roll bike back

[Ish]

Hi

I've got a problem with my bike where if I roll it backwards it will move a little bit and then it feels like something 'tightens up' and I have to put soe real effort in to get it to roll back further.

I looked at the chain and couldn't see anything obvious.

Is this a chain issue or something else?

 

[Ish]

Clutch in/out/neutral gear makes no difference and wheel bearings were recently replaced.

I will check the rear brake out.

 

[Ish]

I haven't had a chance to check it properly but I'm pretty sure it's linked to the rear brake as I noticed it's making the odd squeaking noise as I roll the bike back.