Its a newb stupid question but I have to ask. I lost one of the shims for my front brake pads. I bought new pads for adm ae86 calipers (DB398). New pads have some sort of rubber or viynal backing on them, say the thickness of black gaffa tape. Im thinking this is the equivalent of a shim? The 1 shim I have here is less then a 1mm thick anyway. The back of the old pads are just a flat metal surface. Just want to know if I can do away with using shims.