Not sure on water pump mate. Control arm bushes are a common problem, but I just changed my control arms and bushes my self for £70 and a few hours of my time, and I'm no mechanic. As for hand break, it works like a drum break style break inside the rear disc so this won't be connected to your foot break issue. The foot break issue will be worn pads, the hand break issue will be due to the fact the E46 hand break is just terrible.