Re: How to know if your ball joints are bad & how to check for it?
if the boot is torn and looks like its been torn for a long time, or this is the first time you ever bothered to look, its almost certainly in need of replacement.
for the upper balljoint, you grab the knuckle and just shake. put your other hand around the balljoint and youll feel the play.
the upper balljoint needs to be replaced with the entire arm because honda never sold just the balljoint. you can get just the balljoint aftermarket, AS LONG AS you have the pressed on type of arms. some earlier arms have the balljoint welded on. it should be obvious to distinguish... but even after pressing a new balljoint and securing it with a circlip, its a good idea to spot weld it.
honestly, i think its better to just replace the whole arm... you get new bushings from honda with the new arm.