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@ewanmac
I was an ass and didn't clean my road bike after taking it out in January when it got a bit grimy and now I'm back training properly I find that the rear brake calliper doesn't quite spring all the way open. I've cleaned it now and everything runs smoothly but still the calliper only springs back to about 80% open, it's only when I manually separate the arms of the brake that it opens fully.
I don't think it's the cabling because everything else seems smooth. There is some small rust on the return spring, might this be the problem? I'm unconvinced. Is the most likely scenario that there is still dirt somewhere in the mechanism and I need to remove, dismantle and clean the whole calliper thoroughly? If so is this reasonably easy, I've not taken a brake apart before.
Brakes are SRAM Rival.