Rebuilt off-side rear caliper of my 1975 P6 2200 SC using data found in various threads - for which many thanks guys. Pretty sure hydraulics now ok, not completely clear in my head as to how the strange rods, s springs and things actually work. Think I have got it all back together, but how can I check this before I crawl underneath and put it all back?? Discs are off the car and diff is down low (very low as dodgy hydraulics on borrowed jack) which made life easier, pads are being replaced - what a range of prices on eBay for the same make, up to £40 more in several cases!