Brake troubles

[bishop]

So I recently pulled apart my front brakes again to see which was sticking/why.

With that being taken care of I'm turning my attention to a more important matter, under any braking I've started getting a creak from under the dash about where the brake hinge/brake booster are located and while bleeding the brakes I noticed a lot of flex that doesn't really seem normal.

I know my firewall flexes quite a bit, I watched it move while a friend stepped on the pedal.

I know this is a problem with some newer wrx's and sti's but is it possible my firewall has had a similar fate?