Ok so thought its probably best to replace my brake pads along with my slider pins and rubbers after recent problems. all seemed fine until I drove it and the brake bound up. On investigation found the callipers were not sliding so I have dismantled and refitted to find if I hand tighten the bolt that goes into the back of the slider pins they work fine but as soon as I ratchet them they stop sliding, for obvious reasons leaving hand tightened is not an option and I cant see that the pins would expand with the bolts in them so WTF is going on. The kits were purchased from autodoc/buycarpartsonline (same company). pins are identical to the ones removed but the issue is with both sides.