Low water pressure at tub
Hello. Tub spout recently replaced, as well as the showerhead (needed new ones of both anyway due to bad diverter valve, and I didn't like the old head).
Anyway, I find water pressure coming out to be very low. It's so low that when the shower is being used, and I turn the showerhead upside down, the water only goes a couple of inches in the air.
I started reading about repairing faucets and such. I got the handle off, and the compression nut, but I don't know where to go from here (in fact, I think I'm going the wrong way for this problem).
Behind the faucet are two valves that still let drips of water come out when fully closed (I hate that, old plumbing, etc).However, there are stainless steel supply hoses coming out of the valve and into a brass-looking body with 2 inlets and 2 outlets (hot/cold, tub/shower). After removing the hoses and aiming them into a bucket, and turning the water back on, I get a massive amount of pressure (that I would expect). This is true for both hot and cold. Also, not that it matters, but I get great water pressure out of the bathroom sink as well.
So I guess my next step is getting this brass body off. Am I correct? It appears the body is screwed into the tub's pipe, but the other three ports have the steel hoses and the shower pipe screwed onto them. The fitting on the shower pipe refuses to budge though, and I'm afraid of causing more harm than good.
It's an Aquasource single-handle faucet. If anyone needs pictures I can gladly supply them. Thanks!