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Re: front brakes
rather than WD40 as it would work its way through better, also can you get a punch (or a large nail) and small hammer to tap it through (which might be easier than pulling), and as already suggested careful application of heat.
Once you get them out be sure to grease the pins before refitting again.
Currently in Renoir White's garage:
Renault Trafic 1.7 Petrol Vauxhall Astra 1.4i & in bits Triumph Bonneville T140E & H-D XLH1200