Evening all, I've just spent a couple of hours in the rain trying to fit new discs and pads to the rear of my 2006 Signum, and I've had to throw the towel in after fitting only one disc because the studs (or posts) on the piston-side brake pad do not match the holes in the piston.
I used a brake rewind kit from eBay to successfully wind the piston back. On the adapter disc that fits the brake piston, the studs are 5mm in diameter with 19mm centres.
After 10 minutes of fruitlessly trying to fit the Pagid brake pads I bought from Euro Car Parts, I decided to measure the studs on the back of the pad, and found they were diameter 5.6mm with their centres spaced at 22.2mm.
My first thought was that I'd just purchased the wrong pads, but I double-checked the serial number on the box and the website, and found that they are the ones specified for my car. It could still be a mistake on the part of Euro Car Parts, however I checked the studs on the old pads and surprisingly they also seem to be around 5.6mm with 22mm centres.
I set out to replace the pads because of a god awful rattle from the rear end every time the car went over a bump. On inspection I found the offside pads were worn very unevenly, and looked like wedges. The two studs on the back of the offside piston pad were well worn - presumably from not fitting in the piston holes correctly.
I'm really stuck now... has anyone got any advice on what to do? Obviously I don't want to keep buying sets of pads only to find they don't fit. From what I've read on this forum, 5mm holes/19mm spacing seems to be correct for the piston. It's strange that the previous set of pads also has the wrong hole spacing.
I don't want to fit the new pads without the pad studs fitting the piston, otherwise I'm certain the pads will come loose and wear badly again.
Cheers for looking.