The rear brakes are self-adjusting. How new are your pads? Stock brakes have never been known for being great performers. They were an improvement over the Fox drums, but still not something I'd consider great, just adequate. I have to agree with JJ95GTID that they're definitely known for nose dive, and sometimes some suspension can help with that, but the fronts are still taking the majority of the abuse. If something does seem out of whack, take them apart and ensure the pistons aren't frozen in the bores or something, but short of that, I'd be willing to bet they're working, just that they're not anything great from the factory.