Now, I'm not the most mechanically minded person in the world, which is probably half of the problem, however, my problem is as follows;

I am trying to replace the rear brake disks on my '91 1.3 GTI Charade, but am having trouble removing the caliper. Instead of 2 bolts as I would have imagined were fixing it in place, there is one easily accessible bolt holding the top of the caliper in, but the bottom is secured in another way.

Where I expected there to be a bolt there is a metal cap, which seems to house a sunken bolt, tho I can't be completely certain of this... I have tried to remove this, but cannot find a socket small enough to fit in the hole but also big enough to fit around the bolt-- and I don't think one exists!

I did the front brakes previously, and they both have standard raised bolts, as you would expect, so this is a bit of a mystery to me.

Am I barking up the wrong tree, or do I need to keep trying different sockets until finding the magic one, with Tardis-esque properties?

Any feedback would be appreciated...

Jim.