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Re: Espace III - rear brake issues
The problem isn't with the piston itself, it is the slides that allow the caliper and pads to center over the disc itself.
If you take the wheel of and look at where the pads sit, this needs cleaning (i normally use an old wood chisel to clean the bulk of the cack off then a wire brush to clean up the faces.
There two allen headed pins that you need to unscrew to release the caliper to get at the pads, these have a tendancy to seize. Slow and steady pressure will usually see these release, take them out, use a bit of wet and dry to clean them, lubricate with a smidge of copper slip before reassembly. Then you need to clean the holes that these pins reside. Brake cleaner, WD40 and a pokey device with clothe wrapped around it will suffice. I normally spend a couple of hours doing this to make sure everything is clean, a little smidge of copper slip on the sliding areas. Don't forget to wind the piston right back in and that the handbrake lever on the top of the caliper is fully returned before reconenting everything otherwise you might have handbrake adjustment issues later.
Currently in ice's garage:
2001 Espace 2.2dci, 2005 Espace 2.2dci, Renault Megane 1.6, Citroen Relay, Ford KA & Peugeot Vivacity 50cc (in pink) & 2007 Espace 2.2 dci