Water pressure give somebody the third degree? My brother had a discharge in the kitchen sink. He changed...

My brother had a discharge in the kitchen sink. He changed out the washer and fixed the dribble, but the pressure is now low. He turned on the both the hot and cold valve all the path and still the pressure is low? Any suggestions?
Answers:    he might have paste dirt into screens, bear off tip and verbs
Take apart the pieces you repaired and check for obstructions. Sometimes minerals break loose inside hose supply lines and block the line or return with caught in the stems