Braking Problem

Having been without a Micra in the family for too long, I managed to presude my other half to buy a K12. Its an 06 reg 1.2 16v. It drives really well but there is a clunking that be felt when releasing or depressing the brake, the movement of the pedal also makes a internal squeeky/rubbing noise. Should a good suirt of WD40 help these issues or are there any more serious issues that I should be looking for?
Thanks
 
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