i got a set of 4 pot calipers off some one as a upgrade for my wrx fitted them and changed my drive shaft now the car has developed a horible clicking\nocking noise when i jacked it up to spin the wheel and have a look there didnt seem to be anything up any ideas would be appreciated ,steven

 

Are they Brembos?? If they are its normal after going backwards to forward. The brakes on my 05 STi have been doing this for ages and the brakes work great trust me!!