hi i was wondering if someone could help sometimes when i break at very slow speed in my 94 wrx i can hear a sort of metal on metal clunking noise for acouple of seconds then drives fine for a couple of days before it will do it again any help appreciated

 

Could be one of many things!

Check that the bolts on your calipers are torqued correctly, check for play in your track rod ends, drop links or ARB bushes.. Sounds like something is probably moving under heavy braking then slowly settling back until you brake hard again.