Wasn't sure where to stick this, but hopefully someone here can provide some idea's.
My old man's been getting scrapping from the back wheel for ages now. He pretty much run's his car's into the ground these day's (its had 1 oil change in around 8 years, and that was because i done it whilst doing mine).
So i took the the wheel off and noticed a lot of metal shavings and some shiny scrape marks around the wheel. The scraping was inside the wheel (obviously) and towards the front (the front being the side that faces outwards). The bolts on the calipers were ground down from the scraping. This has happened on both rear wheels (but the drivers side bolt head is too ground down to get anything on it so its gonna have to be grinded out).
I can't understand how this is possibly happening, the calliper is bolted solid (you don't even need to lift it up to change brake pads either which i thought was weird, but its true!). I did notice the back of the disc is touching the slot in the caliper and has worn a lot of the back of the disc away.
The back brake pad had worn down evenly but there was about 5mm of untouched material across the top of the pad. The front pad had even wear and it was like curved so that the two ends had worn more than the middle of the pad.
I took a picture of the calliper which ive put below (may not be very useful). In hindsight i should have taken a load more but my battery was pretty flat.
Any idea's on what could cause this. my only guess is that somehow the caliper has twisted (like grabbing it and twisting it clockwise which would shove the bolts out to the left further, to explain the grinding on those, and close the gap on the back of the disc).
It's probably gonna have to go to a garage anyway, but just trying to work out whats happened.