Basically, got a try-all hope mono trial. Pistons are extremely sticky and covered in gunk. When this brake was last working, the performance was temperamental to say the least. Soooo.... should i strip the whole brake down and put new seals in it? or would just a good clean be in order? is there any way of getting the bore cap off other than the tool? if not...does anyone have one that i could possibly borrow? Thanks, any advice welcome