I'm in the process of overhauling the front calipers on my SDI. It's a late EFI, so has dual circuit brakes with four pot calipers and vented discs. All the pistons are rusty and will have to be replaced.
According to the workshop manual when overhauling these pistons have got to be kept with their bore. Why would this be, given that replacements are available (at a cost)?
I'm asking, because new pistons are 11 quid each from Rimmers, and no longer available from Lockheed, although seal kits are.
I bought some secondhand 4 piston calipers which can't be used as they are single circuit and for solid discs, and have stripped them down and the pistons are perfect. I'm going to use these with new seals in the original calipers and see how it goes.
Also, the single circuit calipers have one bleed nipple, the dual circuit three. Why?