when you fit pads it is a good idea to let the bleed nipple go before you force the pistons back,youll be amazed at the colour of the fluid that comes out.probaly been in there 15years.this will give you a firmer pedal as old fluid has a lower boiling point.also i have heard of seals being turned over in the master cylinder if you just force the pistons back.for most cars this isnt a problem but it has been known on zeds.the improvement in pedal feel is noticeably different once youve bled some fresh fluid through. :rofl: